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diff --git a/4994.txt b/4994.txt new file mode 100644 index 0000000..85bc52c --- /dev/null +++ b/4994.txt @@ -0,0 +1,6969 @@ +Project Gutenberg's Five Thousand Miles Underground, by Roy Rockwood + +This eBook is for the use of anyone anywhere at no cost and with +almost no restrictions whatsoever. You may copy it, give it away or +re-use it under the terms of the Project Gutenberg License included +with this eBook or online at www.gutenberg.org + + +Title: Five Thousand Miles Underground + The Mystery of the Centre of the Earth + +Author: Roy Rockwood + +Release Date: January 26, 2014 [EBook #4994] + +Language: English + +Character set encoding: ASCII + +*** START OF THIS PROJECT GUTENBERG EBOOK FIVE THOUSAND MILES UNDERGROUND *** + + + + +Produced by Jim Weiler and Roger Frank + + + + +[Illustration: THE FLYING MERMAID SANK LOWER AND LOWER TOWARD THE +MYSTERIOUS HOLE.] + +------------------------------------------------------------------------ + + Five Thousand Miles Underground + + Or + + The Mystery of the Centre of the Earth + + BY + + ROY ROCKWOOD + + Author of "Through the Air to the North Pole," "Under + the Ocean to the South Pole," "The Rival + Ocean Divers," Etc. + + ILLUSTRATED + + NEW YORK + CUPPLES & LEON COMPANY + +------------------------------------------------------------------------ + + GOOD BOOKS FOR BOYS + + By Roy Rockwood + + THE GREAT MARVEL SERIES + + THROUGH THE AIR TO THE NORTH POLE + Or The Wonderful Cruise of the Electric Monarch + + UNDER THE OCEAN TO THE SOUTH POLE + Or The Strange Cruise of the Submarine Wonder + + FIVE THOUSAND MILES UNDERGROUND + Or The Mystery of the Centre of the Earth + + Cloth. Illustrated + Price per volume, 60 cents + +------------------------------------------------------------------------ + + Copyright, 1908, by + Cupples & Leon Company + + Five Thousand Miles Underground + +------------------------------------------------------------------------ + + CONTENTS + + I WASHINGTON BACKS OUT + II THE FLYING MERMAID + III WASHINGTON DECIDES + IV WHAT DID MARK SEE? + V ATTACKED BY A WHALE + VI THE CYCLONE + VII A QUEER SAIL + VIII THE FLYING MERMAID DISABLED + IX THE MUTINY + X FOOLING THEIR ENEMIES + XI MYSTERIOUS HAPPENINGS + XII THE BIG HOLE + XIII DOWN INTO THE EARTH + XIV MANY MILES BELOW + XV IN THE STRANGE DRAUGHT + XVI THE NEW LAND + XVII A STRANGE COUNTRY + XVIII CAUGHT BY A STRANGE PLANT + XIX THE BIG PEACH + XX OVERHAULING THE SHIP + XXI THE FISH THAT WALKED + XXII THE SNAKE-TREE + XXIII THE DESERTED VILLAGE + XXIV THE GIANTS + XXV HELD BY THE ENEMY + XXVII A FRIEND INDEED + XXVII A GREAT JOURNEY + XXVIII THE TEMPLE OF TREASURE + XXIX BACK HOME--CONCLUSION + +------------------------------------------------------------------------ + + FIVE THOUSAND MILES UNDERGROUND + + + CHAPTER I + + WASHINGTON BACKS OUT + +"Washington! I say Washington!" + +Throughout a big shed, filled for the most part with huge pieces of +machinery, echoed the voice of Professor Amos Henderson. He did not look +up from a small engine over which he was bending. + +"Washington! Where are you? Why don't you answer me?" + +From somewhere underneath an immense pile of iron, steel and aluminum +came the voice of a colored man. + +"Yas sir, Perfesser, I'se goin' t' saggasiate my bodily presence in yo' +contiguous proximity an' attend t' yo' immediate conglomerated +prescriptions at th' predistined period. Yas, sir!" + +"Well, Washington, if you had started when you began that long speech +you would have been at least half way here by this time. Hurry up! Never +mind tightning those bolts now. Find the boys. I need them to help me +with this engine. They must be around somewhere." + +"I seen 'em goin' fishin' down by th' brook a little while ago," +answered the negro, crawling out from under what seemed to be a combined +airship and watercraft. "Jack says as how yo' gived him permission t' +occupy his indisputatious period of levity in endeavorin' t' extract +from th' liquid element some specimens of swimmin' creatures." + +"If you mean I said he and Mark could go fishing in the brook, you're +right, Washington," replied the professor with a smile. "But you waste a +lot of time and breath trying to say it. Why don't you give up using big +words?" + +"I reckon I was brought up t' it," replied the colored man grinning from +ear to ear. He did not always use big words but when he did they were +generally the wrong ones. Sometimes, he spoke quite correctly. + +"Well, I suppose you can't help it," resumed Mr. Henderson. "However, +never mind that. Find the boys and send them to me." + +"With th' least appreciatableness amount of postponement," answered the +messenger, and he went out. + +Washington White, who in color was just the opposite to his name, a +general helper and companion to Professor Henderson, found Mark Sampson +and Jack Darrow about a quarter of a mile from the big shed, which was +in the center of a wooded island off the coast of Maine. The lads were +seated on the bank of a small brook, fishing. + +"Perfesser wants yo' immediate," said Washington. + +"But we haven't caught a single fish," objected Mark. + +"Them's the orders from headquarters," replied the colored man. "Yo' +both got t' project yo'selves in th' vicinity of th' machine shop. I +reckon th' new fangled contraption that th' perfesser is goin' t' +navigate th' air an' sail th' angry seas in, am about done. He want's t' +try th' engine." + +"Come on then," said Jack. "We probably would not catch any fish, +anyhow, Mark." + +Accompanied by Washington, the youths, each of whom was about eighteen +years old, started toward the big shed. + +While they are on their way opportunity may be taken to tell a little +about them, as well as about Washington and the professor, and the +curious craft on which the scientist was working. + +A few years before this story opens Mr. Henderson had invented a +wonderful electric airship. He had it about completed when, one day, he +and the two boys became unexpectedly acquainted, and, as it developed, +friends. + +Mark and Jack were orphans. After having rather a hard time knocking +about the world trying to make a living, they chanced to meet, and +resolved to cast their lots together. They boarded a freight train, and, +as told in the first volume of this series, entitled, "Through the Air +to the North Pole; or the Wonderful Cruise of the Electric Monarch," the +cars were wrecked near where Professor Henderson was building his +strange craft. + +The boys were cared for by the scientist, and, after their recovery from +hurts received in the collision, they accepted his invitation to make +the trip through the upper regions in the airship, to search for the +north pole. With them went Andy Sudds, an old hunter, and Tom Smith and +Bill Jones, two farmers, but who were hired as helpers on the voyage. +The party had many adventures on the trip, having battles with savage +animals and more savage Esquimaux, and were tossed about in terrible +storms. After making some scientific observations, which the professor +was much interested in, they started back home. + +Having found he could successfully sail in the air, Mr. Henderson +resolved to try what it might be like under water. + +He moved his machine shop to a lonely spot on the Maine coast, and +there, with the help of the boys, Washington, Andy and two machinists +constructed a submarine boat, called the _Porpoise_. + +In this the professor resolved to seek the south pole, he having a +theory that it was surrounded by an open sea. After much hard work the +_Porpoise_ was made ready for the voyage. + +What occurred on this great trip is described in the second book of this +series, called "Under the Ocean to the South Pole, or the Strange Cruise +of the Submarine Wonder." In that is told how once more Tom and Bill, +with Andy, the boys and Washington, accompanying Professor Henderson, +had many thrilling experiences. + +They were caught in the grip of the grass of the terrible Sargasso Sea. +Monstrous suckers grasped the boat in their powerful arms, and had to be +fought off. They were caught in a sea of boiling water and imprisoned +between big fields of ice. + +By means of strong diving suits they were able to leave the ship and +walk about on the bottom of the sea. They visited a graveyard of sunken +ships, saw many strange monsters as well as many beautiful fish in the +great depths to which they sunk. Many times they were in dire peril but +the resources of the professor, the bravery and daring of the boys, no +less than the help Washington and Andy Sudds, the hunter, rendered at +times, brought them through. + +Those of you who read of their adventures will recall the strange island +which they came upon in the Atlantic Ocean, far from the coast of South +America. + +When they first drew near this island they were almost sucked into the +depths of a great whirlpool, caused by water pouring down a big hole +that seemed to lead far into the earth. They reversed their ship just in +time. + +But, on going to another side of the island they were able to approach +safely, as at this point the great hole was farther from the shore. Then +they landed and investigated. + +They found the island was almost circular, and the hole was also round, +but not in the center of the land. It was an immense cavity, so wide +they could not see across, and as for the depth they could only guess at +it. Looking down they could only see rolling masses of vapor and clouds +caused by the water which poured down from the ocean with the force of a +Niagara. + +Gazing down into the big hole Mark suggested it might lead to the centre +of the earth, which some scientists claim is hollow. The professor +admitted that the cavity looked as though it led to China. + +They had no means of investigating further the mystery of the opening +and returned to their submarine, completing the voyage to the south +pole. + +It was now about two years since they had come back from that eventful +trip. One of the first things the professor did, after docking the +_Porpoise_, was to shut himself up in his study and begin to draw plans. +To the questions of the boys he returned no answer for several days. +Then he announced he was working on a craft which could both sail on top +of the water and navigate the air. + +In time the plans were done, and, in order to keep the work secret, the +shop was moved to an island which the professor owned. + +Parts of the _Monarch_ and the _Porpoise_ were used in constructing the +new craft, so there was no need to get other help than that which the +boys, Washington and Bill and Tom could give, since the two latter +accepted an offer of the professor to remain and work for him. The boys, +of course, would not leave their friend. + +The professor realized that he had a more difficult task in his new +venture than he had set himself on other occasions. For a ship to be +light enough to rise in the air, and, at another time, and with no +change, to be strong enough to navigate the ocean, was indeed something +to tax Mr. Henderson's ingenuity. + +However, in the course of a little over a year the larger part of the +work was done. Inside the big shed was the huge affair which, it was +hoped, would enable its owner to be master of both air and water. + +"Did the professor say anything special?" asked Mark of Washington. + +"Nope. I reckon he were too busy problamatin' the exact altitude +projected in an inverse direction by th' square root of th' new engine +when operated at a million times inside of a few seconds, but he didn't +say nothin' t' me. I were busy underneath th' ship, fixin' bolts when he +tole me t' find yo'. I wouldn't be s'prised if he had th' thing goin' +soon." + +"Do you think he'll be generating the new gas to-day?" asked Jack +eagerly. "That's the most troublesome part; to get that gas right." + +"He didn't say nothin' t' me 'bout it," Washington stated, as he walked +along beside the two boys. "He jest seemed anxious like." + +"We'd better hurry," advised Mark. "He may be at an important part in +his experiments and probably needs us. I hope it will work. He has spent +many days on it, and we all have worked hard. It ought to be a success." + +"Perfesser allers makes things work," declared Washington stoutly. + +"That's a good way to feel about it, anyway," observed Mark. "Well, +we'll soon know." + +The three hurried to the shed which they could see as they rounded a +turn of the path through the wood. They noticed an elderly man +approaching with a gun on his shoulder. On one arm he carried a game +bag. + +"Guess Andy got something for dinner," remarked Jack. + +"I hopes so, honey," put in Washington. "I'se got a sort of gone feelin' +in my stomach!" + +"Any luck, Andy?" called Mark, when he came within hailing distance. + +"Fine," replied Andy Sudds. "Rabbits and quail. We'll have a good dinner +to-morrow." + +While Andy entered the living part of the big shed to put away his gun +and game, the boys and Washington kept on to the engine room. They found +the professor, with Bill and Tom, busy fitting pipes to the small engine +which was set up at one side of the structure. + +"Come, boys, I need your aid," remarked Mr. Henderson as they entered. +"Take off your coats and pitch in. Tighten up these bolts, Jack. Mark, +you mix up those chemicals the way I taught you, and see that the dynamo +is in working order for Washington to attend to." + +In a little while the shop was a veritable hive of industry, and it +resounded to the sound of hammers, wrenches and machinery. In the +background was the big ship, which seemed like two immense cigars, one +above the other, the lower one the larger. + +"Where was you calalatin' t' take this here ship when it gits done, +Perfesser?" asked Washington, during a lull in the operations. + +"Do you remember that big hole in the island we visited on our trip to +the south pole?" + +"I suah does," answered the colored man. + +"We are going to explore that," went on the scientist. "We are going to +make a voyage to the interior of the earth in our _Flying Mermaid_." + +"Go down into th' earth!" exclaimed Washington, his eyes big with +fright. + +"Certainly; why not?" + +"Not for mine!" cried the colored man, dropping the wrench he was +holding. "No sir! I'm not goin' t' project myself int' a grave while +I'se alive. Time enough when I kicks th' bucket. No sir! If yo' an' the +boys wants t' risk yo' se'ves goin' down int' th' interior of th' earth, +where th' Bible says there's fiery furnaces, yo' kin go, but Washington +White stays on terra cotta! That's where he stays; He ain't ready t' be +buried, not jest yet!" and the frightened colored man started to leave +the shed. + + + + + CHAPTER II + + THE FLYING MERMAID + + +"Here! Stop him!" cried Professor Henderson. "Don't let him get away. We +still need his help to get the ship in shape. He needn't be frightened. +We're not going to start at once." + +Mark and Jack ran after Washington, whose progress was somewhat impeded +because he kept looking back as if he feared the new ship was chasing +him. + +"Come on back!" said Mark. "There's no danger, and if there was we're +not going to start to-day." + +"Ain't yo' foolin' me?" asked Washington, pausing and looking doubtfully +at the boys. + +"Of course not," answered Mark. "You know Professor Henderson would not +make you do anything you didn't want to do, Wash. He wishes you to stay +and help him get ready, that's all." + +"Well, Washington," observed the aged scientist. "I didn't think you'd +go back on me." + +"I'd do mos' anything fer yo', Perfesser," said the colored man, "but I +got t' beg off this time," and he looked at the _Flying Mermaid_ as if +he thought the metal sides would open and devour him. + +"Then help me get things in shape to generate the gas," the scientist +said. "I want to give the new vapor the first real test in lifting power +to-day. On the success of it depends the future of the ship." + +Seeing there was no immediate danger of being carried to the centre of +the earth, Washington resumed his labors. The professor, the boys, Bill +and Tom were also hurrying matters to enable a test to be made before +night. + +As will readily be seen, even by those not familiar with the +construction of airships and submarines, the chief problem was to find +some agent strong enough to lift from the earth a weight heavier than +had ever before been put into an apparatus that was destined to traverse +the clouds. For the _Flying Mermaid_ was not only an airship but an +ocean voyager as well. It had to be made light enough to be lifted far +above the earth, yet the very nature of it, necessitating it being made +heavy enough to stand the buffeting of the waves and the pressure of +water, was against its flying abilities. + +Professor Henderson realized this and knew that the chief concern would +be to discover a gas or vapor with five times the lifting power of +hydrogen, one of the lightest gases known, and one sometimes used to +inflate balloons. + +After long study he had been partially successful, but he knew from +experiments made that the gas he had so far been able to manufacture +would not answer. What he wanted was some element that could be mixed +with the gas, to neutralize the attraction of gravitation, or downward +pull of the earth. + +While he was seeking this, and experimenting on many lines, the +construction of the air-water ship went on. In general the outward +construction was two cigar shaped hulls, one above the other. Aluminum, +being the lightest and strongest metal that could be used for the +purpose, formed the main part of both bodies. + +The upper hull was one hundred feet long and twenty feet in diameter at +the widest part. It tapered to points at either end. It was attached to +the lower hull by strong braces, at either end, while from the center +there extended a pipe which connected with the lower section. This pipe +was intended to convey the lifting gas to the part which corresponded to +the bag of the balloon, save that it was of metal instead of silk, or +rubber as is usual. + +There were two reasons for this. One was that it would not be liable to +puncture, particularly in the proposed underground trip, and the other +was that it did not have to be so large as a cloth bag would have had to +be. It was also a permanent part of the ship, and on a voyage where part +of the time the travelers would be in the air and part on the water, and +when the change from one to the other would have to be made quickly, +this was necessary. It would have taken too long to raise the ship in +the air had a cloth bag been used to contain the gas. + +The lower hull or main part of the craft was one hundred and fifty feet +long, and forty feet through at the largest part, in the centre. + +It was divided into four sections. The forward one contained the +sleeping quarters of Professor Henderson and his crew. There was a small +stateroom for each one. Above was a conning or observation tower, +reached by a small flight of steps. From this tower the ship could be +steered, stopped and started, as could also be done from the engine +room, which was in the after part of the hull. + +As in the _Porpoise_ and _Monarch_, electricity formed the motive power +and was also used for many other purposes on board. Engines operated by +gas produced the current which heated, lighted and moved the ship, as +well as played a part in producing the wonderful gas. + +The ship moved forward or backward by means of a novel arrangement. This +was by the power of compressed air. From either end of the lower hull +there projected a short pipe working in a ball and socket joint, so it +could be turned in any direction. By means of strong pumps a current of +compressed air could be sent out from either pipe. Thus when floating +above the earth the ship was forced forward by the blast of air rushing +from the pipe at the stern. It was the same principle as that on which a +sky rocket is shot heavenward, save that gases produced by the burning +of powder in the pasteboard rocket form its moving impulse. + +In the case of the _Flying Mermaid_, it could be made to move backward +by sending the air out of the forward tube. Thus, when in the water, the +compressed air rushing from the pipe struck the fluid and forced the +ship forward or backward as was desired. It floated on the surface, the +deck being about three feet out of water, while the aluminum gas bag was +overhead. + +The engine room was a marvel of machine construction. It contained pumps +for air and water, motors, dynamos, gas engines, and a maze of wheels +and levers. Yet everything was very compact and no room was wasted. + +The use of the air method of propulsion did away with the necessity of a +large propellor such as most airships have to use, a propellor which +must of necessity be very light and which is easily broken. + +Next to the engine room was the kitchen. It contained an electric range +and all necessary appliances and utensils for preparing meals. There +were lockers and a large reserve storeroom which when the time came +would be well stocked with food. Forward of the kitchen was the living +and dining room. It contained comfortable seats, folding tables and a +small library. Here, also were many instruments designed to show how the +various machines were working. There were gages, pointers and dials, +which told the direction the ship was traveling, the speed and the +distance above the earth or below the surface. Similar indicators were +in the conning tower, which had a powerful search light. + +The ship was lighted throughout by incandescent lamps, and there was +even a small automatic piano worked by the electric current, on which +popular airs could be played. + +If the gas and the gravity neutralizer worked as Professor Henderson +hoped they would, as soon as the ship was completed, all that would be +necessary to start on the voyage would be to fill the aluminum bag and +set the air compressor in motion. + +The gas was made from common air, chemically treated and with a secret +material added which by means of a complicated machine in a measure did +away with the downward pull of the earth. Thus all that was necessary to +carry on a long voyage was a quantity of gasolene to operate the engine +which worked the electric machines, and some of this secret compound. + +The professor and his helpers had been working to good advantage. At +last all was in readiness for the gas test. + +It was proposed to try it on an experimental scale. Some of the fluid +was to be generated and forced into an aluminum cylinder under the same +pressure it would be used in the air ship. To this cylinder were +attached weights in proportion to the weight of the _Flying Mermaid_ +with its load of human freight, engines and equipment. + +"This cylinder is just one one-hundredth the size of the cylinder of the +ship," said the professor. "I am going to fasten to it a hundred pound +weight. If it lifts that our latest contrivance will be a success." + +"You mean if the little cylinder pulls a hundred pounds up the big ship +will take us and the machinery up?" asked Mark. + +"Certainly," answered the professor. "If this cylinder lifts a hundred +pounds, one a hundred times as big (as that of the _Mermaid_ is), will +lift a hundred times as much, or ten thousand pounds. That is five tons, +or more than a ton over what I figure to be the weight of our ship and +contents. The latest war balloon can lift one ton with ease, and if my +machine can not do five times as well I shall be disappointed." + +The last adjustments were made, pipes were run from the gas generator to +the cylinder, and the hundred pound weight was attached. + +"Everybody look out now," said Mr. Henderson. "I am going to start the +machine and let the gas enter the cylinder. It is a very powerful gas +and may break the cylinder. If it does you must all duck." + +The scientist gave a last look at everything. The boys got behind some +boards whence they could see without being in danger. Washington, who +had little fear so long as there was no danger of going under ground, +took his place at the dynamo. Andy Sudds, with Bill and Tom, stationed +themselves in safe places. + +"All ready!" called the professor. + +He pulled a lever toward him, turned a wheel and signalled to Washington +to start the dynamo. There was a sound of buzzing machinery, which was +followed by a hiss as the gas began to enter the cylinder under +pressure. Would it stand the strain? That question was uppermost in +every one's mind save the professor's. He only cared to see the cylinder +leave the ground, carrying the weight with it. That would prove his long +labors were crowned with success. + +Faster and faster whirred the dynamo. The gas was being generated from +the air. The secret chemical made a hissing which could be heard for +some distance. The gage registered a heavy pressure. Anxiously the +professor watched the cylinder. + +"There!" he exclaimed at length. "It has all the gas it can hold. Now to +see if it works!" + +He disconnected the pipe leading from the generator. This left the +cylinder free. It seemed to tremble slightly. There appeared to be a +movement to the hundred pound weight which rested on the ground. It was +as if it was tugging to get loose. + +"There it goes! There it goes!" cried Mark, joyfully. + +"Hurrah!" shouted Jack. "There she rises!" + +"It suttinly am projectin' itself skyward!" yelled Washington, coming +from the dynamo. + +Sure enough the cylinder was slowly rising in the air, bearing the +weight with it. It had lifted it clear from the ground and was +approaching the roof of the big shed. + +"It will work! It will work!" exclaimed the professor, strangely +excited. + +The next instant the cylinder, carrying the weight, sailed right out of +an open skylight, and began drifting outside the shop, and across the +fields. + +"Quick! We must get it back!" cried Mr. Henderson. "If it gets away my +secret may be discovered and I will lose all! We must secure it!" + +But the cylinder was now two hundred feet in the air and being blown to +the east, the weight dangling below it, making it look like a miniature +airship. + +"We can never catch that!" cried Mark. + + + + + CHAPTER III + + WASHINGTON DECIDES + + +"We must catch that cylinder!" the professor exclaimed. "Some one may +find it when it comes down and analyze the gas. Then he would discover +how to make it. The cylinder must come down!" + +"Don't see how we can proximate ourselves inter th' vicinity of it +lessen we delegate th' imperial functions of ornithological specimens t' +some member of this here party," observed Washington. + +"If you mean we can't catch that there contraption unless we turn into +birds I'll show you that you're mistaken!" cried Andy Sudds. "I guess I +have a trick or two up my sleeve," and the old hunter quickly threw open +the breech of his gun and inserted a couple of cartridges. + +He raised the piece to his shoulder and took quick aim. There was a +sliver of flame, a puff of smoke and a sharp report. The professor and +the boys who were watching the cylinder saw it vibrate up in the air. +Then there came a whistling sound. An instant later the metal body began +to descend, and it and the weight fell to the earth. + +"I'm sorry I had to put a bullet through it, Professor," said old Andy +with a queer smile, "but it was the only way I saw of bringing it down. +Hope it isn't damaged much." + +"It doesn't matter if it is," the scientist answered. "I can make more +cylinders, but I don't want that secret of the gas to become known. Your +bullet served a good turn, Andy, for it let the compressed vapor out +just in time." + +"Then we may consider the experiment a success," said Mark, as +Washington went to where the cylinder had fallen, to detach it from the +weight and bring both to the shed. + +"It seems so," Mr. Henderson answered. "True, it was only an experiment. +We have yet to test the ship itself." + +"When can we do that?" asked Jack. + +"I hope by Monday," the scientist answered. + +"Will you try it in the water or air first?" asked Mark. + +"I'm almost certain it will float in the water," the aged inventor said. +"It does not require much work to make a ship which will do that. But +the air proposition is another matter. However, since the cylinder rose, +I am pretty sure the _Flying Mermaid_ will. + +"But we have done enough work to-day. Let's rest and have something to +eat. Then, with Sunday to sit around and talk matters over, we will be +ready for Monday's test." + +Some of the game Andy had killed was soon on the table, for Washington, +in addition to his other accomplishments, was an expert cook. During the +evening the boys and their friends sat in the living room of the big +shed and talked over the events of the day. + +Sunday was spent in discussing what adventures might lie before them +should they be able to descend into the big hole. Washington did not say +much, but it was easy to see he had no notion of going. He even began to +pack his few belongings in readiness to leave the service of Mr. +Henderson, for whom he had worked a good many years. + +No one remained long abed Monday morning. Even Washington was up early +in spite of the interest he had lost in the professor's voyage. + +"I jest wants t' see yo' start fer that place where they buries live +folks," he said. + +In order to properly test the _Flying Mermaid_ it was necessary to move +the craft from the shed from which place it had never been taken since +it's construction was started. It had been built on big rollers in +anticipation of this need, so that all which was now necessary was to +open the doors at the end, and roll the craft out. + +This was accomplished with no small amount of labor, and it was nearly +noon before the big ship was moved into the open. It was shoved along to +a little clearing in front of the shed, where no trees would interfere +with its possible upward movement. + +Everyone was bustling about. The professor was busiest of all. He went +from one machine to another; from this apparatus to that, testing here, +turning wheels there, adjusting valves and seeing that all was in +readiness for the generating of the powerful gas. + +As the airship was half round on the bottom and as it rested in a sort +of semi-circular cradle; it brought the entrance some distance above the +ground. To make it easier to get in and out while preparations for the +trial were going on, Bill and Tom had made an improvised pair of steps, +which were tied to the side of the ship with ropes. + +Up and down these the professor, the boys and Andy went, taking in tools +and materials, and removing considerable refuse which had accumulated +during the building of the craft. + +Finally all was in readiness for starting the making of the gas. The +ship was not wholly complete and no supplies or provisions for the long +voyage had been taken aboard. The _Flying Mermaid_ was about a ton +lighter than it would be when fully fitted out, but to make up for this +the professor had left in the ship a lot of tools and surplus machinery +so that the craft held as much weight as it would under normal +conditions. If the gas lifted it now it would at any other time. + +"Start the generator," said Mr. Henderson, to Mark. "We'll soon see +whether we are going to succeed or fail." + +The boy turned a number of levers and wheels. The machine which made the +powerful vapor was soon in operation. The professor had already added +enough of the secret compound to the tank containing the other +ingredients, and the big pump was sucking in air to be transformed into +the lifting gas. + +The boys and the professor were in the engine room. Andy Sudds, with +Bill and Tom, had taken their places in the living room, to more evenly +balance the ship, since the things in it were not yet all in their +proper places. As for Washington he was busy running from the shed to +the ship with various tools and bits of machinery the professor desired. + +The gas was being generated rapidly. Throughout the ship there resounded +a hissing noise that told it was being forced through the pipe into the +aluminum shell above the ship proper. + +"I wonder how soon it will begin to lift us," said Mark. + +"It will take about half an hour," replied Mr. Henderson. "You see we +have first to fill the holder completely, since there is no gas in it. +After this we will keep some on hand, so that it will only need the +addition of a small quantity to enable the ship to rise." + +He was busy watching the pointer on a dial which indicated the pressure +of the gas, and the lifting force. The boys were kept busy making +adjustments to the machinery and oiling bearings. + +Suddenly, throughout the length of the craft there was felt a curious +trembling. It was as though the screw of a powerful steamer was +revolving in the water. + +"What is it?" asked Jack. + +"I hope it is the lifting power of the gas making itself felt," the +professor answered. "Perhaps the _Flying Mermaid_ is getting ready to +try her wings." + +The trembling became more pronounced. The gas was being generated faster +than ever. The whole ship was trembling. Tom and Bill came from the +room, where they were stationed, to inquire the meaning, but were +reassured by the professor. + +"Don't be alarmed if you find yourselves up in the air pretty soon," he +remarked with a smile. "Remember the _Electric Monarch_, and the flights +she took. We may not go as high as we did in her, but it will answer the +same purpose." + +The gas was hissing through the big tube as it rushed into the overhead +holder. The gage indicated a heavy pressure. The ship began to tremble +more violently and to sway slightly from side to side. + +"I think we shall rise presently," said Mr. Henderson. His voice showed +the pride he felt at the seeming success with which his invention was +about to meet. + +Suddenly, with a little jerk, as though some one with a giant hand had +plucked the _Flying Mermaid_ from the earth, the ship gave a little +bound into the air, and was floating free. + +"Here we go!" cried Mr. Henderson. "The ship is a success. Now we're off +for the hole in the earth!" + +The _Flying Mermaid_ was indeed rising in the air. True it did not go up +so swiftly as had the _Monarch_, but then it was a much heavier and +stronger vessel, and flying was only one of its accomplishments. + +"It's a success! It's a success!" shouted Mark, capering about in his +excitement. + +"Now we'll see what the centre of the earth looks like," went on Jack. +"I can hardly wait for the time to come when we are to start on the +voyage." + +At that instant, when the ship was but a few feet from the ground, but +slowly rising, the boys and the professor heard a shouting below them. + +"What's that?" asked the scientist. "Is any one hurt?" + +Mark ran to a small window, something like a port hole in an ocean +steamer, and looked out. + +"Quick!" he shouted. "Stop the ship! Washington will be killed!" + +In fact from the agonized yells which proceeded from somewhere under the +craft it seemed that the accident was in process of happening. + +"Save me! Save me!" cried the colored man. "I'm goin' to fall! Catch me, +some one!" + +"What is it?" asked the professor, making ready to shut off the power +and let the ship settle back to earth, from which it had moved about +fifty feet. + +"It's Washington," explained Mark. "He evidently tried to walk up the +steps just as the boat mounted skyward. He rolled down and managed to +grab the end of the rope which was left over after the steps were tied. +Now he's swinging down there." + +"Are you going to lower the ship?" asked Jack. + +"Of course!" exclaimed the professor. "I only hope he hangs on until his +feet touch the earth." + +"Keep a tight hold!" shouted Mark, from out of the small window. + +"That's th' truest thing yo' ever said!" exclaimed Washington. "You bet +I'm goin' to hold on, and I'm comin' up too," which he proceeded to do, +hand over hand, like a sailor. + +The boys and the professor watched the colored man's upward progress. +The ship had hardly begun to settle as, in the excitement, not enough +gas had been let out. Closer and closer came Washington, until he was +able to grasp the edge of the opening, to which the steps were fastened. + +"I thought you weren't coming with us," observed the professor, when he +saw that his helper was safe. + +"I changed my mind," said the colored man. "It's jest luck. Seems like +th' ship done wanted me t' go 'long, an' I'm goin'. I'll take my chances +on bein' buried alive. I ain't never seen th' centre of th' earth, an' I +want's to 'fore I die. I'm goin' 'long, Perfessor!" + + + + + CHAPTER IV + + WHAT DID MARK SEE? + + +"Well, I'm glad you've decided at last," the professor remarked. "Now +come inside and we'll see how the ship works." + +Once over his fright, Washington made himself at home on the craft he +had helped build. He went from one room to another and observed the +engine. + +"She certainly am workin'" he observed with pride. "Are we still goin' +up, Perfessor?" + +"Still mounting," replied Mr. Henderson. "We are now three hundred feet +above the earth," he added as he glanced at a registering gage. + +The great air pump was set going and soon from the after tube, a big +stream of the compressed vapor rushed. It acted on the ship instantly +and sent the craft ahead at a rapid rate. By elevating or depressing the +tube the craft could be sent obliquely up or down. Then, by forcing the +air from the forward tube, the _Mermaid_ was reversed and scudded +backward. + +But it was more with the ship's ability to rise and descend that +Professor Henderson was concerned, since on that depended their safety. +So various tests were made, in generating the gas and using the negative +gravity apparatus. + +All worked to perfection. Obeying the slightest turn of the wheels and +levers the _Mermaid_ rose or fell. She stood still, suspended herself in +the air, or rushed backward and forward. + +Of course the machinery was new and did not operate as smoothly as it +would later, but the professor and his friends were very well satisfied. + +"Now we'll try something new," said the scientist to the two boys as +they stood beside him in the tower. "I only hope this part succeeds, and +we shall soon be off on our voyage." + +He turned several levers. There was a hissing sound as the gas rushed +from the container, and the ship began to settle down. + +"What's th' matter? Are we goin' t' hit th' earth?" yelled Washington, +rushing from the engine room. + +"Keep quiet," ordered the professor. "We are only going down, that's +all." + +"But good land! Perfesser!" exclaimed the colored man. "The ocean's +right under us! You forgot you sailed away from the island! We'll be +drowned suah!" + +"Leave it to me," said Mr. Henderson. "The _Flying Mermaid_ is going to +take a bath!" + +"As long as it swims it will be all right," observed Mark in a low tone +to Jack. "I'm glad I can take care of myself in the water." + +Before Jack could reply the _Mermaid_ seemed to take a sudden dive +through the air. The next instant she struck the water with a splash +that sent the waves rolling all about. The craft rocked violently to and +fro on the surface of the sea. For a while there were anxious hearts +aboard, for there was no certainty but that the ship might not sink to +the bottom. + +But the old professor had not calculated and builded in vain. After +rocking about like a vessel newly launched, the strange craft rode +safely and upright on the water. It set down far enough to bring the +propelling tubes well under, but not so far but that the conning tower +was well out and there was a small deck available. + +"Now to see if we can conquer the water as we did the air!" cried the +professor. "Mark, start the air pump. Jack, you steer, for I want to +watch the machinery under the additional strain." + +From the rear tube rushed such a volume of air that the ocean near it +bubbled and foamed. The ship trembled from stem to stern, and then, +after hanging for an instant as if undecided what to do, it began to +move forward as easily as though it had never sailed any other element +than the sea. + +"She fits her name!" the professor cried. "She is indeed the _Flying +Mermaid_, for she sails the ocean as easily as she navigates in the +clouds!" + +For a mile or two the craft was sent ahead over the waves. Then it was +reversed and run backwards. Satisfied that his long months of work had +not gone for naught, the professor after trying several experiments, +decided to try and raise the ship while in motion. + +With Jack and Mark to look after the air pumps, while Washington, Tom +and Bill busied themselves in the engine room, Mr. Henderson began to +generate the gas and start the negative gravity apparatus. All the while +the craft was forging ahead. + +There was again the hissing sound that told of the aluminum holder being +filled. For a few minutes there seemed to be no change, the _Mermaid_ +plowing forward. + +Then like a bird rising from the waves, or like a flying fish leaping +from the sea to escape some pursuing monster of the deep, the new ship +shot up diagonally from the surface and winged its way into the upper +regions of the air. + +"Success! Success!" cried the professor. "This proves all I wanted to +know. Now we are ready for our great trip!" + +Great were the rejoicings in the camp that night. It was like living +over again the days when they were aboard the diving _Porpoise_ or the +flying _Monarch_. To the recollections were added the anticipations of +what was before them in the trip to the interior of the earth. + +Busy days followed, for there was still much to be done to the _Flying +Mermaid_. The machinery, which was only partly completed, had to be +finished. Besides this the professor was working on some apparatus, the +use of which he did not disclose to any one. It was stored aboard the +ship at the last minute. + +Plenty of provisions had to be taken aboard, and many supplies needed to +work the _Mermaid_ and insure that it would go to the end of the voyage. +The materials for generating the gas and negative gravity, spare parts, +records for the automatic piano and other things were stored away. + +Some guns and ammunition were taken along as were a few revolvers, since +old Andy had said it was best to prepare for any thing in the shape of +enemies or wild beasts that might be met with in the interior regions. + +It was decided to make the start by sailing along the surface of the sea +for several days, as in the event of any weakness in the machinery being +discovered there would be less danger. If, at the end of four days, no +trouble developed, the professor said he would send the _Mermaid_ into +the air and make the rest of the voyage through the sky. + +The night before the start was to be made the professor, with the boys, +Washington and the other helpers, went about through the various shops +and buildings, locking them up securely. For they could not tell how +long they would be away, and they had to leave behind much valuable +material. + +As there were several things that needed attention they divided the work +up. Mark had finished his share and was walking back toward the living +cabin where they were all quartered, when, down at the shore, near where +the boat was moored, he fancied he saw, in the gathering darkness, a +moving figure. + +"I wonder who that can be," he thought. "All the others are near the +machine shop, for I just left them there. Perhaps it's some one trying +to spy out how the _Mermaid_ is built." + +Knowing the professor wanted his secret well guarded, Mark walked softly +toward the little dock that served as a place whence the _Mermaid_ could +be easily boarded. As he approached he saw the figure moving. Something +struck the boy as peculiar. + +Though the object had some of the characteristics of a man it did not +walk like a human being, but shuffled along more like a huge ape or +monkey. It seemed bent over, as if it stooped toward the ground. + +"Who are you?" called Mark suddenly. + +For an instant the figure halted and then hurried on faster than before, +with a curious, shuffling walk. It was approaching the ship. + +Somehow it struck Mark as if it was an uncanny being; an inhabitant of +some other world. Then he laughed at his half-fear, and started on a run +toward the dock. + +"If it's some tramp trying to find a place to sleep he'd better not go +aboard the ship, he might do some damage," the boy thought. + +He could hardly see the figure now as it had passed into the shadow cast +by the boat. He was about to summon the professor to make an +investigation, when Washington started going the search light which was +placed just over the door of the living cabin. It was kept there as a +sort of beacon light, as, near the island was a dangerous ledge of +rocks. + +Then, in the blinding white glare from the big lantern as Washington +accidentally swung it toward the _Mermaid_, Mark beheld a strange sight. + +The figure he had been watching stood out in bold relief. Though it was +shaped like a human being it was not like any person the boy had ever +seen. It seemed covered with a skin twice too large for it; a skin, +which, in spite of the clothes that concealed it, hung in folds about +the arms and legs, dropping pendent like from the neck like a big +garment, and flapping in the wind. + +For an instant Mark was so startled he cried out, and the professor and +the others ran to see what was the matter. + +"There--by the ship! A horrible creature!" exclaimed Mark. + +Shouting to Washington to keep the light steady in the direction of the +dock, Mr. Henderson ran toward the moored _Mermaid_. Jack, Andy, Bill +and Tom, with Mark in the rear followed him. + +"Nothing here," said the scientist, after a careful search about. "Are +you sure you saw something, Mark?" + +"Positively," replied the lad with a shudder. He described the vision of +the darkness. + +"I guess it was a big otter, or maybe an enormous turtle," the professor +said. + + + + + CHAPTER V + + ATTACKED BY A WHALE + + +But Mark was certain it was nothing like that, though a careful search +failed to reveal anything or any person near the ship. It was too dark +to examine for footprints, and even Mark, after taking a look all about, +felt he might have been deceived by shadows. Still he was a little +nervous, and could hardly sleep for imagining what the thing he saw +could have been. + +The next day every one was so busy that no one, not even Mark, recalled +the little excitement of the night before. Shortly after noon, final +preparations having been made, they all got aboard the _Mermaid_ and +started off. + +It was a bright sunshiny day, and the craft, speeding away from the +island where it had been constructed, over the dancing blue waves, must +have presented a strange sight had there been any spectators. For surely +no such ship had ever before sailed those waters. + +However, there was no other vessel in sight, and the island, as far as +the professor and his friends knew, had never been inhabited. + +"We will not try for any great speed," Mr. Henderson remarked as he, +with Mark and Jack, stood in the conning tower managing the _Mermaid_. +"We don't want to strain any joints at the start or heat any engine +bearings. There will be time enough for speed later." + +"Yes, and we may need it more when we get into the centre of the earth +than we do now," observed Mark. + +"Why so?" asked Jack. + +"No telling what we may run up against underneath the ground," went on +Mark. "We may have to fight strange animals and stranger beings. +Besides, the atmosphere and water there can't be the same as up here; do +you think so, Professor?" + +For a few minutes the scientist was silent. He seemed to be thinking +deeply. + +"I will tell you what I believe," he said at length. "I have never +spoken of it before, but now that we are fairly started and may +eventually have a chance to prove my theory, I will say that I think the +centre of this earth on which we live is hollow. Inside of it, forming a +core, so to speak, I believe there is another earth, similar to ours in +some respects which revolves inside this larger sphere." + +They were well out to sea now, as they could observe when they emerged +on the little deck. Above their heads was the aluminum gas holder, which +served as a sort of protection from the sun that was quite warm. The +_Mermaid_ rode with an easy motion, being submerged just enough to make +her steady, yet not deep enough to encounter much resistance from the +water. In fact it could not have been arranged better for speed or +comfort. + +"I think we will sail well to the eastward before making our course +south," Mr. Henderson said. "I do not care to meet too many ships, as +those aboard will be very curious and I do not want too much news of +this venture to get out. We will take an unfrequented route and avoid +delays by being hailed by every passing vessel whose captain will wonder +what queer craft he had met with." + +The boys enjoyed the sail, for the weather could not have been better. +Even old Andy, who seldom said much, seemed delighted with the prospect +of having strange adventures. He had his rifle with him, and, indeed, he +seldom went anywhere that he did not carry it. + +"For there's no telling when you may see something you want to shoot or +that ought to be shot," he used to say, "and it's always the man without +a gun who needs it most. So I'm taking no chances." + +They sailed all that afternoon without meeting with a craft of any kind. +Straight to the east they went, and when night began to settle down +Washington got supper. It was decided to run slowly after dark until all +hands were more familiar with the ship. + +Morning found the _Mermaid_ about a hundred miles from the island where +she had been launched. The night had been uneventful, except that Mark +told Jack he heard some strange noise near his bunk several times. He +was nearest the storeroom where spare parts, and the curious cylinder +the professor had brought aboard, were kept. + +"I guess it was rats," said Jack. "They are always in ships." + +"Old wooden ships, yes," admitted Mark. "But I'll bet there's not a rat +aboard the _Mermaid_." + +"Then you were dreaming," said Jack, as if that settled it. + +Mark did not speak further of the noise, but he did considerable +thinking. However, the next night there was no further disturbance. + +The fourth day out, when everything had passed off well, the engines +doing their best, the professor decided to speed them up a bit, since he +was satisfied they had "found" themselves as mechanics term it. + +"We'll see how fast we can go through the water," said Mr. Henderson, +"and then I think we can safely turn our course south. We are well +beyond the ordinary lines of travel now." + +Having oiled the bearings well, and seen that everything was in place +and properly adjusted, the professor and the boys took their places in +the conning tower, while Washington, Tom and Bill remained in the engine +room. Andy stayed on deck with his gun. + +"I might see a big fish, and we could vary our bill of fare," he said +with a laugh. + +"Here we go!" exclaimed the professor as he shifted the levers and +turned some wheels and valves. "Now we'll see how fast we can travel." + +As he spoke the _Mermaid_ responded to the added impulse of the +compressed air and shot through the water at a terrific speed. The +sudden increase in momentum almost threw the boys from their feet, and +they would have fallen had they not grasped some projecting levers. + +"I guess that will do," said the scientist. "I think we have speed +enough for almost any emergency. I'll let her run at this rate for a +while, and then we'll slack up." + +Looking ahead, the boys could see the green waters parting in front of +the bow of the _Mermaid_, as if to make room for her. Two huge waves +were thrown upon either side. + +Suddenly, dead ahead, there loomed up a big black object. + +"Look out you'll hit the rock!" cried Mark to the professor, who was +steering. + +With a turn of his wrist Mr. Henderson moved the wheel which controlled +the tube. It was deflected and sent the boat to larboard. + +At that instant from the rock two small fountains of water rose in the +air, falling back in a shower of spray through which the sun gleamed. + +"That's not a rock! It's a big whale!" cried Jack. "And we're going to +hit him!" + +The professor had miscalculated the speed of the craft, or else had not +thrown her far enough to larboard, for, a second later, the _Mermaid_ +was almost upon the big leviathan. + +With a desperate twirling of the steering wheel the professor veered the +craft as far as possible. But all he could do did not suffice, for the +craft hit the whale a glancing blow on the side, and the ship careened +as if she would turn turtle. + +At the same time there rang out from upon deck the sound of a rifle +shot. Old Andy had taken a chance at the enormous creature of the deep. + +"Hurrah!" the boys heard him shout. "I give him one plumb in the eye! A +fine shot! And we hit him besides with the boat. I guess he's a goner!" + +"I'm afraid not," muttered the professor. "That was a bad blow we struck +him, but I think it will only ruffle his temper. We'll have to look +sharp now, boys." + +By this time the ship had rushed past the whale, but the boys, looking +through a window in the rear of the tower could see the huge body. Now +the fountains of water which the whale spouted were tinged with red. + +"He's bleeding!" exclaimed the professor. "I guess Andy hit him in a +vital spot." + +"But not vital enough!" cried Mark. "See! He's coming after us!" + +And so it proved. The whale, angered, and, probably half crazed by the +pain of the bullet and the blow, was coursing after the ship, coming on +with the speed of an express train. Straight at the _Mermaid_ he lunged +his huge bulk. + +"We must escape him!" cried Mr. Henderson. "If he hits us he'll send us +to the bottom!" + +He had made ready to slow up the _Mermaid_ to see if it had sustained +any damage from the impact with the whale, but when he saw the monster +coming after the boat he knew the only safety lay in flight. + +"Let us go up into the air and so escape him!" cried Jack, with sudden +inspiration. + +For an instant neither Mark nor the professor grasped what Jack meant. +Then, with an exclamation, the professor pulled forward the lever that +generated the gas and set working the gravity neutralizer, which would +enable the ship to rise. + +Faster through the water went the _Mermaid_, and faster after her came +the whale. Above the hum of the engines was heard the hiss of the +powerful gas. The ship trembled more violently. + +"We are rising!" exclaimed the professor, as he looked at a gage. + +The boys could feel the craft lifting from the waves which clung to her +as if they hated to lose her. The boys knew the gas was beginning to +operate. + +"If it is not too late!" whispered Mark, half to himself. + +For the monster of the seas was coming on, lashing the water to foam +with his terrible flukes, and sending aloft a bloody spray. His speed +was awful. + +Now he was but ten feet away from the fleeing craft--now but eight--now +five! Ten seconds more and the big head, like the blunt stern of a +battle ship, forced forward by the tons of blubber, flesh, bone and fat +behind it would strike the _Mermaid_ and crush it like an egg shell. + +Now if ever was the need for the _Flying Mermaid_ to prove herself +worthy of the name. Now, if ever, was the time for her to leave the +watery element and take to the lighter one. + +And she did. With a last tremble, as if to free herself from the hold of +the waves, the gallant craft soared up into the air, leaving the water, +which dripped from her keel like a fountain's spray, and shooting aloft +like a bird, escaped her terrible enemy which passed under her, so close +that the lower part of the _Flying Mermaid_ scraped the whale's back. + +"Saved!" exclaimed the professor. + +[Illustration: THE LOWER PART OF THE FLYING MERMAID SCRAPED THE WHALE'S +BACK.] + + + + + CHAPTER VI + + THE CYCLONE + + +It was only in the nick of time, for a second later and the big mammal +of the ocean would have struck the ship and split it from stem to stern. + +Higher and higher into the air mounted the _Flying Mermaid_, while in +the water below, the whale, incensed by missing his prey, was lashing +the waves to foam. + +"Well, that was a narrow squeak; as close as I ever care to come to it!" +exclaimed Andy as he let go of the steel rail to which he was clinging +and entered the conning tower. "I had no idea of hitting the big fish." + +"I guess he would have taken after us whether you had fired at him or +not," said Mr. Henderson. "He was probably looking for trouble, and took +the first thing that came in his way, which happened to be us. Some +whales are like that, so I have read; big bull creatures, exiled from +the school to which they once belonged, they get like mad creatures and +know neither friend nor foe. Something like rogue elephants, I imagine." + +Now, having thus unexpectedly risen into the air, the professor decided +to continue travel in that style for a while at least. It would require +less force to propel the ship, and the going would be more comfortable, +since in the upper regions the _Mermaid_ rode on an even keel, while in +the water there was more or less rolling, due to the action of the +waves. + +Once recovered from their fright caused by the whale, and having lost +sight of the enormous creature, for they were now far above the ocean, +the adventurers began to think of something to eat. + +Washington lost little time in preparing a meal, and it was eaten with a +relish. The electric cooking stove worked to perfection, for the colored +man had learned how to use that aboard the _Porpoise_ and _Monarch_, and +could be depended on to turn out appetizing dishes. + +"What do you say to traveling through the air at night?" asked Mr. +Henderson, as he arose from the table. + +"Suits me," replied Mark. "There's less danger than in the water, I +think." + +Bill, Tom and Washington arranged to stand the night watch, and, when +the professor had examined the engines and given orders about keeping +the ship on her course through the air, he retired to his bunk. Jack and +Mark soon followed. + +It must have been about midnight when Mark was awakened by a movement +that seemed to come from the storeroom next to where his sleeping place +was located. At first he thought he had been dreaming, but, as he found +he was wide awake, he knew it was no imagination that had affected him. + +"I certainly heard something," he said to himself. "It sounded just as +it did the other night. I wonder if I ought to investigate." + +He thought over the matter carefully as he sat upright in his bunk in +the darkness. True the noise might be a natural one, due to the +vibration of the engine, or to some echo from the machinery. As Mark +listened he heard it again. + +This time he realized it was the slow movement of some heavy body. He +felt a cold shiver run over him and his hair evinced an uncomfortable +tendency to stand upright. But he conquered his feelings and resolved to +keep cool and see if he could discover what had awakened him. + +He got up and moved softly about the little room that contained his +bunk. He could hear better now, and knew it was no echo or vibration +that had come to his ears. + +Once again he heard the strange sound. It was exactly the same as +before; as if some big creature was pulling itself over the floor. + +"Maybe it's a snake; a water snake!" thought Mark. "It may have crawled +aboard when we did not notice it." + +Then he remembered that the ship had not been open in any way that would +enable a serpent to come on it, since it had been started on its ocean +trip. Before that, he was sure no snake had entered the _Flying +Mermaid_. Still it sounded more like a snake than anything else. + +"I'm going to make a search," decided the boy. + +He took a small portable electric light, run by a storage battery, and, +slipping on a pair of shoes and a bath robe, he left his stateroom. + +He had decided that the noise came from the storage compartment and so +made for that. The door he knew was not locked, since he had seen Mr. +Henderson go in late that afternoon, and the professor had used no key. + +Moving softly, Mark left his room and soon found himself in a corridor, +on either side of which were located the sleeping quarters of the +others. He did not want to awaken them, and, perhaps, be laughed at for +his curiosity. + +To get to the storeroom Mark had to go first from the corridor into the +dining room. He soon reached the door that guarded what he thought might +be a strange secret. Trying the knob softly he found it giving under his +fingers. + +"I wonder if I had better go in," he thought. "Perhaps, after all, it +was only rats, as Jack said." + +But, even as he listened he again heard the odd sound coming from the +room. This determined him. He would solve the mystery if possible. + +Cautiously he turned the knob. The door was slowly swinging open when +Mark was startled by a noise from behind him. He turned suddenly to see +Professor Henderson confronting him. + +"What is it, Mark? Is the ship on fire? What's the matter? Is any one +hurt?" + +"I was just going in this room to----" began Mark. + +"Don't do it! Don't do it!" exclaimed the professor in an excited +whisper. "No one must go in that room. I forgot to tell you and Jack +about it. No one must enter. It contains a secret!" + +"I heard a strange noise and----" Mark began again. + +"It could make no noise! It would be impossible for it to make a noise!" +the professor exclaimed. + +"I heard something," the boy insisted. + +"You were dreaming!" said the professor. "Now go back to bed, Mark, and +don't let this happen again. Remember, no one must enter that room +unless I give permission!" + +Somewhat crestfallen at the outcome of his investigations, but realizing +that the professor could do what he wanted to aboard his own ship, Mark +went back to bed. But he could not sleep. All the rest of the night he +was wondering whether Mr. Henderson had some strange creature hidden +aboard the _Mermaid_. He feared lest the old scientist's mind might be +affected and, in his wildness he had made some infernal machine that +would, in time, blow the whole ship apart. + +But tired nature asserted itself at last, and, weary with vain +imaginings, Mark fell into a slumber. The next morning he awoke with a +start from a dream that he was being devoured by an immense water snake. + +He said nothing to the others about his night's adventure, for, as it +transpired, no one else had been awakened by his investigations. The +professor did not refer to his conversation with Mark. + +"There's something queer going on aboard the ship this trip," said Mark +to himself. "But I guess it's none of my business. Professor Henderson +seems to know what he is doing and I guess I can trust him." + +He resolved to think no more of the strange noises and movements, and, +for several nights thereafter he was not disturbed by them. + +The weather, which, up to this time had been fair, took a sudden turn +for the worse about the fourth day after Mark's little night expedition. +One evening the sun sank in a mass of dull lead-colored clouds and a +sharp wind sprang up. + +"We're going to have a storm," said Mr. Henderson. "It's liable to be a +bad one, too, from the way the barometer is falling." + +He looked at the glass, and scanned the various instruments that told +how high up the _Mermaid_ was and how fast she was traveling. + +"We're pretty high up in the air," he said, "and scooting along at about +fifty miles an hour. We are going against the wind, too, but fortunately +it is not blowing hard." + +At that moment there sounded from without a peculiar howling sound, as +if a siren whistle was being blown. + +"'Pears like there's goin' t' be a tumultuous demonstration of +sub-maxiliary contortions in th' empherial regions contiguous t' th' +upper atmosphere!" exclaimed Washington, entering from the engine room +into the conning tower. + +"What's the trouble?" asked Mr. Henderson. + +"Terrible big black cloud chasin' us from behind!" exclaimed the colored +man. + +Noting the alarm in Washington's voice the professor glanced from the +rear window. What he saw caused him to exclaim: + +"It's a cyclone! We must drop down to avoid it!" + +He sprang to a lever controlling the gas and yanked it toward him. There +was a shrill hissing sound, and a second later the _Mermaid_ began to +sink. The boys watching the gages on the wall of the tower, saw that the +craft was falling rapidly. + +But, with a rush and roar, the terrible wind was upon them. It caught +the craft in its fearful grip and heeled it over as a ship careens to +the ocean blast. + +"It's a storm in the upper regions! We'll find it calm below!" cried the +professor above the howling of the gale. He opened the gas outlet wider +and the ship fell more rapidly. + +"Are you sure we're over the ocean?" asked Mark. + +"Positive!" the professor called back. "We have been traveling straight +south over the Atlantic for the last week. We will land in the midst of +the waters and float safely." + +Lower and lower went the _Mermaid_. The wind was now blowing with the +force of a tornado, and, as the craft had to slant in order to descend, +it felt the power of the gale more than if it had scudded before it. +But, by skilful use of the directing tube, the professor was able to +keep the boat from turning over. As they came further down toward the +earth the force of the wind was felt less and less, until, as they came +within two hundred feet of the water which they saw below them in the +gathering dusk, it died out altogether. + +"Now we are free from it," said the professor as the _Mermaid_ came down +on the waves like an immense swan. + +"Are you going ahead or going to stop here?" asked Mark. + +"We'll keep right on," Mr. Henderson answered. "No telling when the +storm may strike down here. We'll go as far as we can to-night." + + + + + CHAPTER VII + + A QUEER SAIL + + +Now that the fear and worriment was over they all began to feel hungry, +and, while Mark and Jack took charge of the conning tower Washington got +breakfast. The professor seemed preoccupied during the meal, and several +times, when Mark spoke to him, he did not reply. + +"I wonder if he is worried about something, or is thinking of something +which seems to be concealed in the storeroom," the boy thought. + +But, after a while, the professor seemed to be more like himself. He was +busy over several maps and charts, and then announced the ship would try +air-sailing again for a while. + +"We can make better time above than we can on the water," he said, "and +I am anxious to get to the mysterious island and learn what is in store +for us." + +Perhaps if the professor had been able to look ahead, and see what was +soon going to happen, he would not have been so anxious for it to occur. + +It was shortly after dinner when, the gas container having been filled, +the ship rose in the air, and began sailing over the ocean, about a mile +up. The day was a fine one, and, as they were moving south, it was +constantly growing warmer. Down on the water, in fact, it was quite hot, +but in the air it was just right. + +Like some immense bird the _Mermaid_ went flying through the air. The +boys and the professor sat upon the deck in easy chairs. It was like +being on the top of some tall "sky-scraper" building which, by some +strange power, was being moved forward. Below them the ocean tumbled in +long, lazy swells. + +Suddenly Mark, who was looking through a telescope at the expanse of +water stretched out under them, gave a cry. + +"There's a ship! She's on fire!" + +"Where?" asked the professor, stretching out his hand for the glass. + +"Just to the port of the forward tube. See the smoke!" exclaimed Mark. + +Mr. Henderson looked. Through the lens he saw a column of black vapor +rising skyward. Mingled with it were red flames. + +"Lower the _Mermaid_!" he cried. "We must save those on board if we +can!" + +Mark ran to the conning tower, where Washington was, to give the order. +The colored man, who was looking ahead, intent on guiding the ship, did +not at first hear what Mark called. + +"Lower us! Send the _Mermaid_ down!" Mark cried again. + +The sudden shout and the excited voice of Mark so startled Washington, +that, fearing some accident had happened, he pulled the lever, +controlling the gas supply, with more force than necessary. + +There was a loud explosion, followed by a crackling sound, a flash of +light, and the _Mermaid_ came to a sudden stop. + +"What's the matter?" cried Mark, feeling that something was wrong. + +"I don't know!" Washington replied, as he dashed toward the engine room. + +The _Mermaid_, her forward flight checked, hung in the air, suspended, +neither rising or falling. + +"Why don't we go on down?" the professor asked, hurrying to the tower. + +"There has been an explosion--an accident!" exclaimed Mark. "I guess we +can't go down!" + +"But we must!" Mr. Henderson insisted, seizing the lever which should +have produced a downward motion. The handle swung to and fro. It was +disconnected from the apparatus it operated. + +The ship was now stationary in the air, moving neither forward nor +backward, neither rising nor falling. Washington had stopped the air +pumps as soon as he learned something was wrong. + +When Mr. Henderson saw the useless lever, which had controlled the +outlet of gas from the holder, he ran out on deck. One glance told him +what had happened. One of the electric wires had become +short-circuited,--that is, the insulation had worn off and allowed the +current to escape. This had produced a spark, which had exploded the gas +which was in the pipe leading from the generator up into the aluminum +holder. Fortunately there was an automatic cut-off for the supply of +vapor, or the whole tank would have gone up. + +As it was, only a small quantity had blown up, but this was enough to +break the machinery at the point where the lever in the conning tower +joined the pipe. If it had not been for the automatic cut-off all the +gas in the holder would have poured out in a great volume, and the ship +would have fallen like a shot. + +"Can we do nothing to save those on the burning vessel?" asked Mark, +pointing to where a cloud of smoke hung over the ocean. + +"I fear not, now," answered the professor. "We are in a bad plight +ourselves." + +"Are we in any danger?" asked Jack. + +"Not specially," Mr. Henderson replied. "But we must find a means of +lowering ourselves gradually." + +"Then it will be too late to save any of those on the ship," observed +Mark. + +"I'm afraid so," the scientist made reply. + +The _Mermaid_ rested some distance above the surface of the waters. She +moved slightly to and fro with the wind, and rocked gently. The +professor was examining the broken machinery. + +"I have a plan!" suddenly cried Mark. + +"What is it?" asked Mr. Henderson. + +"Can't we bore a hole in the tank, insert a small faucet or tap, and let +the gas out that way gradually?" asked the boy. "When we get down we can +rescue those in danger of fire, and, later, can repair the break." + +"The very thing!" exclaimed Mr. Henderson. "I never thought of that! +Here, Washington! Bring me a drill, and a small stop-cock!" + +The drill was obtained from the engine room. Working rapidly Mr. +Henderson bored a hole in the lower part of the holder. As soon as the +metal was penetrated the gas, which was under considerable pressure, +rushed from the tank with a hissing sound. At once the _Mermaid_ began +to settle rapidly. + +But the professor was prepared for this. He thrust the end of the +stop-cock into the hole. It was screwed fast and the valve turned. This +stopped the flow of gas and checked the descent of the ship. Then, by +opening the tap the vapor was allowed to escape gradually, bringing the +_Flying Mermaid_ gently to the water. + +As the adventurers approached they could see that the vessel was now a +mass of flames. The wind was driving the fire toward the forecastle, and +the crew had sought refuge aft. But this expedient could not last long, +for, already the tongues of fire were licking the sides of the craft and +coming nearer and nearer the seemingly doomed men. The vessel was a +large one, and heavily laden. + +As those in peril caught sight of the _Mermaid_ settling down into the +water, apparently from the clouds, their fears gave place to +astonishment. So great was this that they ceased their cries of terror. +Then, as they saw that the strange craft navigated the ocean, for the +engines were started aboard the _Mermaid_, they began to call for help. + + + + + CHAPTER VIII + + THE FLYING MERMAID DISABLED + + +"We'll save you!" shouted Mr. Henderson, who was on the deck, while Mark +was steering the craft. "Hold on a few minutes longer and we'll be +alongside!" + +"They're real! They're real!" some of those aboard the burning ship +could be heard to shout. Evidently more than one of them had taken the +_Mermaid_ for a delusion of their fear-crazed brain. + +"They are real persons!" they called again and again. "They are coming +to save us!" + +Mr. Henderson ran his ship as near the burning craft as he dared. Then +he called to the crew to leap into the water and swim to him. He, with +Washington, Jack, Bill and Tom, stood ready to haul aboard any who were +too weak to help themselves. + +In a few minutes all of those left alive on the sailing vessel--fourteen +in all--had come safely aboard the _Mermaid_. The ship was now +completely enveloped in flames. + +"Are there any more left on her?" asked Mr. Henderson of one who +appeared to be a mate of the burning craft. + +"Not a soul!" was the answer. "The captain and ten men perished in the +flames. The fire broke out a week ago in the lower hold. We fought it as +well as we could but it got the best of us. Then it suddenly broke +through the decks, almost like an explosion, a little while ago, and the +captain and others were lost, and so were our small boats. We managed to +get aft but were about to give up when you appeared." + +"What ship is it and where are you from?" + +"The _Good Hope_, laden with logwood, hides, jute and other materials +from South America," the mate answered. "We were bound for New York." + +"It is more like the _Last Hope_ instead of the _Good Hope_," observed +Mr. Henderson in a quiet voice, as he saw the flames mount higher and +higher over the ship. A few seconds later the craft seemed rent by an +internal explosion. It appeared to break in two parts, and, amid a +shower of sparks and a cloud of black smoke, the vessel sank under the +water and was seen no more. + +The rescued men turned to behold the final end of their ship. They +betrayed no particular emotion, and some of them even laughed, which the +professor thought, at the time, was rather strange. But there was little +opportunity for speculation. The men were in a sad plight. Few of them +had more than the clothes they stood in, though each one wore about his +waist a belt, and all of them seemed to guard the leather circlets +jealously. + +The professor and his crew were soon busy supplying remedies for burns, +since several of the men were seared by the flames. Then, as it was +learned they had eaten nothing for many hours, it having been impossible +to use the galley, a meal was prepared and the survivors of the wreck +were well fed. + +The hunger of the newcomers having been appeased, they showed much +curiosity over the strange craft that had so opportunely come to their +rescue. Most of the sailors were ignorant men, and the professor had +little fear of them learning anything concerning his secrets. He +explained briefly about the _Mermaid_, but said nothing of whither she +was bound. + +The addition of fourteen men to the rather small accommodations of the +_Mermaid_ was a serious matter to consider. The ship was able to hold +them all, and even to sail through the air with them, since Mr. +Henderson had provided an excess of power. But it was going to be a +problem to feed so many, and still save enough provisions for the long +voyage which lay ahead. + +However, Mr. Henderson felt his first duty to be toward his fellowmen, +even if his voyage must be delayed, or given up for a time, while he got +more provisions. There would be no sleeping quarters for the sailors, +but when this was explained to them they cheerfully said they would +sleep on deck if necessary. In fact some of them had to, but as the +weather was warm and clear this was no hardship. A few found quarters in +the engine room and other apartments of the _Mermaid_. + +Finding, after an examination, that his ship was in good order save for +the broken gas apparatus, Mr. Henderson gave orders to proceed along the +surface of the ocean. The sailors wanted to see how it felt to mount +into the air, but Mr. Henderson, refused to attempt a flight until he +had made complete repairs, and this would take a day or more. + +At this there appeared to be some discontent among the survivors, and +they muttered to each other as they stood in a group on deck. But the +professor and his assistants were too busy with their preparations for +fixing the break to notice this. + +While the men were gathered in a knot near the after part of the small +deck, the mate separated from them, and, coming close to where Mark was +standing, unscrewing some of the broken parts of the pipe said, in a low +voice. + +"Tell the captain to watch out." + +"What do you mean?" asked Mark quickly. + +"Hush! Not so loud!" the mate exclaimed. "If the men hear me talking to +you, or see me, they may kill me. Tell the captain to look out; that's +all. Be on guard, and watch the engine room carefully." + +"But why--?" Mark began, when, turning suddenly, the mate left him. It +was well he did so, for, at that instant, one of the sailors, who had +observed the two conversing, strolled in their direction. + +Much alarmed, Mark sought Mr. Henderson and told him what he had heard. + +"I suppose the fire may have turned the poor man's head," the scientist +said. "I wonder if he thinks the men I rescued would mutiny and take +possession of my ship? If they did they would not know how to work it, +so what good would it do?" + +"Hadn't we better look out?" asked Mark. + +"I'm not afraid," replied the professor. "I will be too busy the next +few days, repairing the break, to think of anything else. Besides, what +would they want to harm us for? Didn't we save their lives?" + +Seeing the scientist placed no faith in what the mate had said, Mark +went back to his task. + +It soon became too dark to work, and it was decided, after supper, to +halt the ship until morning as it would be less risky. + +Mark did not sleep well, his dreams being disturbed by visions of +pirates and black flags. But morning came and nothing had developed. The +men seemed to recover their spirits with daybreak, and most of the crew, +after breakfast, greeted Mr. Henderson pleasantly, and asked to be +allowed to help fix the ship. + +It took the skilled labor of the professor, Washington and the boys to +mend the break, and, even at that, it was four days in the repairing. +But at last the final bolt was in place, and the _Mermaid_ was able to +resume her trips through the air. + +"We will rise the first thing in the morning," said the professor to +Mark and Jack that night. "I am anxious to see how the ship behaves with +a big load aboard." + + + + + CHAPTER IX + + THE MUTINY + + +Mark was awakened that night by feeling some one trying to turn him +over. At first he thought it was Jack, and sleepily muttered that he +wanted to be let alone. + +"Sorry I can't oblige ye, my hearty!" exclaimed a rough voice in his +ear, "but I got particular orders t' tie you up!" + +At that Mark tried to sit up, but he found he could not. He discovered +that he was closely bound with many turns of a rope, while in front of +his bunk stood one of the rescued sailors. + +"There," said the man, with a final tightening of the ropes. "I guess +you're safe." + +"What's the matter? What does it all mean?" asked Mark, much bewildered. + +"It means that we have possession of the ship," the sailor answered, +"and, if you're wise you'll not make a fuss. It wouldn't do any good, +anyhow, as all your friends are in the same condition." + +Then, picking Mark up, as if he was a baby, the man slung him over his +shoulder and carried him to the living room. There Mark saw Jack, the +professor, Washington, and the others similarly bound. + +"Do you realize what you are doing?" asked the professor angrily of his +captors. "You are mutinying, and are liable to severe punishment." + +"If they ever get us," added one of the men. "We've got the ship now, +and we mean to keep her. You'll have to run her or show us how." + +"Never!" cried the professor. + +"I guess he will when he feels this," said one of the men, as he dragged +from a recess two wires. "I happen to know something of electricity, and +when he feels these perhaps he'll change his mind. I'll start the +dynamo." + +The sailor showed that he was acquainted with machinery, for soon the +hum of the electric apparatus was heard. + +"Now to make him tell!" the man with the wires exclaimed, advancing +toward the professor, who turned pale. + +"Stop! You must not torture the old man!" cried a voice, and the mate of +the _Good Hope_ stepped in front of the sailor with the electrified +wires. + +"Who's going to stop me?" asked the man. + +"I will. It's not necessary," the mate went on quickly. "If we make him +weak we may kill him, and he can not tell us what we want to know. One +of the boys can tell us how to run the ship." + +The mate came quickly over to where Mark lay, and whispered: + +"Consent to tell. It is the only way of saving his life. Tell 'em how to +raise the craft. Then leave all to me. I will save you all and the ship, +too, if I can. But consent." + +Mark nodded his head, and the mate cried: + +"I knew I could fetch 'em. I have hypnotic power. This boy will raise +the ship for us. Loosen his bonds, some of you." + +Satisfied that they were now on the way to experiencing a new sensation, +the sailors took the ropes off Mark's arms and legs, and he was allowed +to rise. With a reassuring nod toward the professor he led the way to +the engine room, followed by half the men. He resolved to start the gas +machine slowly, so as to make the upward trip last longer, thinking +before it had gone far, some way of escape from the mutineers might be +found. + +While a crowd of the sailors stood near him, Mark operated the machinery +in the engine room that started the gas generating, and set the negative +gravity apparatus working. + +"You'd better not try any tricks on us," said one of the men in an ugly +tone of voice. + +"I'm not going to," replied Mark. "If you go out on deck you will soon +see the ship leaving the water and mounting into the air." + +"Some of you go," ordered a man with a big bushy red beard. "See if the +ship rises. When she begins to go up sing out. I'm going to stay here +and see how the young cub does it so I can work it myself." + +Obeying the red-bearded man, who seemed to be a leader, several of the +sailors went out on the deck. It was quite dark, but there was a +phosphorous glow to the water which made the rolling waves visible. + +The gas was being generated, as could be told by the hissing sound. Mark +watched the machinery anxiously, for he knew much depended on him, and +the professor was not at hand to guide and instruct him. He watched the +dial of the gage which registered the gas pressure and saw it slowly +moving. In a little while it would be at the point at which the ship +ought to rise. + +Presently a quiver seemed to run through the _Mermaid_. Now a shout came +from the watchers on deck. + +"She's going up!" + +The ship was indeed rising. The red-bearded man, who was addressed as +Tony, ran from the engine room to the deck. He saw that the ship was now +ten feet above the water. Back he came to where Mark stood by the gas +machine. + +"Lucky for you that you didn't fool us, lad," he said with a leer. "See +that you mind me hereafter. Now show me how the shebang works." + +When the ship had risen as far as Tony desired he made Mark send it +straight ahead. The boy adjusted the air tube to carry the craft toward +the south, but Tony, seeing by a compass in which direction they were +headed, ordered Mark to steer due east. + +"Fix things so they will stay so, too," added Tony. "I don't want to +stop until I get a thousand miles away. Then we'll come down, sail to +some sunny island, and enjoy life." + +Mark locked the steering apparatus so as to keep the _Mermaid_ headed +due east. + +"Now you can go back to your friends," Tony said. "When I want you I'll +send for you." + +With a heavy heart Mark rejoined the professor and others. He found them +with their bonds removed. But to guard against their escape several men +were on watch outside the door. + +"What are they doing?" asked the professor eagerly as Mark entered, and +the boy told him what had taken place. + +"They will ruin my ship and spoil the whole trip," cried the old +scientist. "Oh, why did I ever go to the rescue of the scoundrels?" + +"Never mind," said Jack. "Perhaps we may yet outwit them." + +Morning came at last. The ship was still shooting forward at fast speed, +in an easterly direction. The sailors had learned, in their short stay +aboard, where the food and stores were kept, and they lost little time +in getting breakfast. They sent some in to their captives, including a +big pot of hot coffee, and, after partaking of this the professor and +his friends felt better. + +The mate of the _Good Hope_ came in to help clear away the dishes. As he +passed Mark he slipped into the boy's hand a note. + +"Don't read it until you are alone," he said in a low voice, as he +hurried from the room. + +As soon as the other sailors had left, Mark glanced at the slip of +paper. It bore these words: + +"Open when you hear three raps, then two, then three, and keep silent." + +"What is it?" asked Mr. Henderson. + +Mark showed him the paper. + +"I wonder what it means," the boy said. + +"Do you think he is a friend of ours?" the professor asked. + +Mark told him of the mate's conversation the night previous. + +"I think we can trust him," the scientist went on. "He must intend to +pay us a visit when the others are asleep. When we hear the knocks as he +specifies we must open the door and let him in." + +All that day the captives were kept in the living room. Once or twice +Mark was sent for to make some adjustment to the machinery, but the +apparatus, for the most part, was automatic, and needed little +attention. The professor, as well as the others, were all impatience for +the promised visit of the mate. Still they felt he would not come until +night. + +In fact it was long past midnight before Mark, Jack and the professor, +who were anxiously listening, heard the three raps, then two, then three +more. Mark quickly opened the door, and the mate stepped inside, holding +his finger to his lips as a sign of caution. Old Andy, Washington, Bill +and Tom had fallen asleep. + +"I have only time for a few words," the mate said. "I am closely +watched. Tony mistrusts me. I will save you if I can." + +"Why have they repaid my kindness with such actions?" asked Mr. +Henderson. + +"Because they are desperate men," replied the mate. "They are nothing +more than pirates. They mutinied on the other ship, killed the captain +and those of the crew who would not join them, and started off to seek +their fortunes. I pretended to join them to save my life, but I have +only been watching for a chance to escape. + +"Because of lax discipline the ship was sent on fire. We tried to put it +out but could not. The rest you know. + +"I heard them plan to capture this airship, but could do nothing to stop +them. Then I resolved to pretend to act with them. They fear pursuit for +their other mutiny, and are anxious to get as far away as possible." + +"Do you think they will abandon the ship in a little while?" asked the +professor hopefully. + +"I'm afraid not," answered the mate. "I think they want to get rid of +all of you, so they can sail about as they please. Tony is a smart man. +He could soon learn to run this ship, he thinks." + +"I doubt it," Mr. Henderson answered. "But how are you going to help +us?" + +"I have not fully made up my plans," the mate answered. "However I +wanted you to know I would do my best to save you. Now I must go. Be on +the watch and when I can I will let you know what I have decided on. I +will hand Mark a note when I bring your meals, just as I did to-day. I +think----" + +"Hark! What was that?" asked the professor. + +There was a noise outside the door, as if some one was listening. + +"Put out the lights!" whispered the mate, and Jack switched off the +electric incandescents. + +A knock sounded on the door and the voice of Tony called: + +"Mark! Come here! I want you to look at the gas machine. It has stopped +working, and we are falling!" + + + + + CHAPTER X + + FOOLING THEIR ENEMIES + + +Mark hurried into the corridor, taking care to close the door after him, +so Tony could get no glimpse of the mate who had risked so much to save +his friends. But he need not have been alarmed for the leader of the +mutineers was too excited over the stopping of the gas apparatus to give +any heed to who was in with the captives. + +"Do you think you can fix it?" he asked the boy. + +"I guess so," Mark replied confidently. "If I can't there is no danger, +for we will fall gradually and land in the water." + +"But I don't want to do that," Tony objected. "I want to keep on through +the air." + +Mark did not reply. By this time he was at the gas machine. He soon saw +nothing was the matter save that new material must be placed in the +retort where the vapor was generated. He refilled it, the gas was +manufactured once more, and the ship began to rise. + +"I will know how to do it next time," Tony said with a grin. Mark +realized that every time he showed the leader of the mutineers something +about the ship it was putting the professor and his friends more and +more into the power of the scoundrels. But there was no help for it. + +The ship was still plunging ahead, and kept about a mile above the +earth. As there was no further need of Mark, he was told he could go +back to his friends. When he reached the room where they were held +prisoners, he found the mate had gone away, promising again to do all he +could for them. + +The next night, which it seemed would never come, for the day, locked as +the captives were in their room, seemed endless, finally closed in. +Mark, Jack and the professor were anxious to know whether the mate would +pay them another visit. As for Andy, Tom and Bill, while they were +interested in the ship, and wanted to be free from the power of the +mutineers, they did not lose any sleep over it. + +Shortly after midnight, there came again the peculiar knock, and the +mate entered the room. He seemed much excited over something, and, as +soon as the portal was securely closed he said to Professor Henderson: + +"Is there an island any where near here where men could live for a +time?" + +"What do you mean?" asked the scientist. "Do you want us to desert the +ship and leave these scoundrels in charge?" + +"Nothing of the sort," replied the mate, who, had said his name was Jack +Rodgers. "But first answer my question. A great deal may depend on it." + +Seeing Rodgers was in earnest, the professor looked over some maps and +charts, and announced that they were within a few hundred miles of a +group of islands. + +"When would we reach them?" was Rodgers' next question. + +Mr. Henderson made a few rapid calculations on a piece of paper. + +"At the present rate of sailing," he said, "we should be there about ten +o'clock to-morrow. That is, provided the ship does not slacken speed or +increase it." + +"There is no danger of either of those two things happening," said the +mate. "Tony is too afraid of the machinery to do anything to it. So you +may safely figure that our speed will continue the same." + +"Then I can guarantee, with all reasonable certainty," the professor +said, "that about ten o'clock to-morrow we will be less than a mile from +the islands. They are a group where friendly natives live, and where +many tropical fruits abound. One could scarcely select a better place to +be shipwrecked. But I hope the plans of Tony and his friends do not +include landing us there." + +"No, nothing like that," the mate answered. "Quite the contrary. But I +had better be going. I will try and see Mark some time to-morrow. Tony +does not mind when I speak to him." + +With this Rodgers left the captives, as he heard some of the sailors +moving about and did not want to be discovered. The professor and the +boys wondered what the mate's plan might be, but they had to be content +to wait and see. + +The night passed without incident. About nine o'clock the next morning +the mate came to the door of the room where the professor and his +friends were prisoners. He made no secret of his approach, but knocked +boldly. + +"Tell Mark I want to see him," he said, as the professor answered. "All +of you keep quiet," he added in a whisper. "There may be good news +soon." + +Mark slipped from the room. He followed the mate to the upper deck +which, at that time was deserted as all the sailors were in the dining +room eating, which practice they indulged in as often as they could. + +"I have a plan to get rid of these rough men," the mate said to Mark. +"It may work, and, again it may not. At any rate it is worth trying. It +all depends on you with what help I can give you." + +"I'm willing to do my share," Mark said, and for the next ten minutes +the boy and the mate were in earnest conversation. + +It was about thirty-five minutes later when there arose a sudden +commotion in the ship. Mark had returned to his friends and the mate had +disappeared. The confusion seemed to come from the engine room where +Tony had posted some of his men. + +"We're falling down! We'll all be killed!" shouted the men. "The ship is +falling into the sea!" + +"What is the trouble?" asked the professor as he heard the commotion. + +"It is part of the mate's plan," said Mark. "He told me to tell you to +do nothing. If Tony or any of the other men come to you just refer them +to me." + +Two minutes later Tony came rushing into the apartment where the +captives were held prisoners. + +"Here! Come quickly, Mark!" he exclaimed. "Something has gone wrong with +the gas machine again, and you must come and fix it before we are all +dashed to pieces!" + +With every appearance of haste Mark rushed from the apartment, following +Tony. The latter led the way to the engine room. + +"Can anything be done?" he asked. + +Mark took a survey of the machinery. + +"It is too late," he said as though much excited. "The ship is falling +down toward the sea with terrific force." + +It needed but a glance at the height gage to show this. The pointer was +revolving rapidly about the face of the dial. + +"Will the ship stand the blow?" asked Tony. + +"Not at the rate it is falling," replied Mark. "She will go all to +pieces when she strikes the water, and she may explode!" + +"What are we to do then?" asked the leader of the mutineers. + +"We must save ourselves!" cried the mate, running in at this juncture. +"Let our prisoners shift for themselves as best they can. Let's all leap +into the sea. There we at least have a chance for our lives. But if we +stay on this ship we will all be drowned like cats in a bag." + +"What do you propose?" asked Tony, his face white with fear. + +"When the ship comes near enough the surface of the water to make it +safe we should all drop overboard!" the mate exclaimed. "We are near +some islands, I understand, and we can thus save our lives by swimming +ashore." + +This plan seemed to meet with instant favor, and a little later there +was a rush for the deck, as each one wished to be the first to escape +from the boat they believed to be doomed. + +Lower and lower fell the _Mermaid_. She was like a wounded bird which +the shot of the hunter has crippled. Down and down she fluttered. + +By this time all the sailors, save the mate were on deck. He and Mark +remained in the engine room. + +"Don't let her get too low," the mate whispered. + +"I'll watch out," Mark replied. "I want to give them a good scare while +I'm at it." + +The ship was now within fifty feet of the water. There was a cry of +terror from the sailors. Some of them leaped over the rail and started +to swim ashore, as the ship was by this time close to a group of +islands. + +Suddenly, from the engine room the mate rushed. + +"Jump! Jump for your lives!" he exclaimed. "The ship is about to blow +up!" + + + + + CHAPTER XI + + MYSTERIOUS HAPPENINGS + + +The voice of the mate echoed through the _Mermaid_. Those on deck heard +it, as did Tony in the engine room, where he was vainly trying to +understand the complicated machinery. + +An instant later there sounded from beneath the ship a series of +splashes. More sailors were leaping from the deck of the craft to the +ocean. The distance was not great, particularly as they all landed in +water. + +"Quick!" cried the mate to a group of sailors that hesitated before +taking the jump. "The ship may blow up any minute now." + +The men needed no second urging. As soon as they struck the water they +began to swim ashore, as it was not far away. One after another they +jumped over the rail. Tony was the last to go. He urged the captives to +follow him, but they all refused. + +A minute later the only one of the pirate crew left on the ship was the +mate. The others were all struggling in the sea. Eventually they all +reached shore in safety. + +The airship was now within about twenty feet of the water. It was still +falling but not so rapidly. + +"Better send her up, now," said the mate to Mark, and the boy turned the +necessary levers to accomplish this. + +Dipping into the water as a sea gull does when searching for food on the +wing, for she had come quite low, the _Mermaid_ mounted once more into +the air, and was soon sailing along over the heads of Tony and his gang. + +"What's it all about?" asked Mr. Henderson, who seemed in a sort of +stupor. "I thought the ship was broken. How, then, can it rise?" + +"It was only a trick of mine," Rodgers said. "The gas machine is not +broken. I had Mark fix it so that only a little vapor would be +generated. When the supply in the holder was not enough, and no more was +being made, the ship had to sink. Mark and I pretended it was worse than +it really was just to scare the scoundrels." + +"And you evidently succeeded," observed Mr. Henderson. "They have all +left us. I am glad you stayed." + +"So am I," said Rodgers. "I was just waiting for a chance to escape from +that crowd. This was the plan I thought of that night. I wanted to see +the men put on some island where they could manage to live, and which +was not too far away." + +The _Mermaid_ was now mounting upward rapidly, as Mark had adjusted the +machinery properly. The craft was well rid of the pirate crew, and was +able to proceed on its way, and enable Mr. Henderson to carry out his +plans. + +When the _Mermaid_ had reached a certain height her prow was turned the +other way, and she was sent back racing over the ground she had just +covered. But now the ship was in the hands of friends. Fortunately no +great damage had been done by the sailors, and the professor was soon +able to get things in ship-shape. The engines had not been molested and +were working better than ever. + +"Now to make another attempt to reach the big hole in the earth," the +professor cried. "We will be careful next time, who we rescue from ships +at sea." + +The island was soon left behind, becoming a mere speck on the ocean. +Those aboard the _Mermaid_ knew no harm could befall the sailors, as +there were no savage tribes on the little spot of land. Eventually the +sailors were picked up by a passing vessel and taken to their homes. The +story of their first mutiny leaked out and they were properly punished. + +It required several days travel before the airship regained the distance +she had lost because of the plans of the pirates. Also, there were a +number of minor repairs to make, and the professor and his friends were +kept busy. + +"How much longer before we come to the big hole?" asked Jack, one day. + +"I think we ought to be near it in about two weeks," the professor +replied. "I only hope we shall not be disappointed, and will be able to +explore it." + +"'Tain't goin' t' be no fun t' be decimated an' expurgitated inter a +conglomerous aggregation of elements constituting th' exterior portion +of human anatomy," said Washington in dubious tones. + +"You mean you're afraid of being boiled in the steam from the big hole?" +asked Mark. + +"Jest so," replied the colored man. + +"You don't need to worry about that," put in the professor. "I will not +take the ship down if there is any danger, though of course there will +be some risk." + +The ship, having been fully repaired, was now able to be speeded up, and +was sent scudding along toward her destination. Rodgers proved a +valuable acquisition toward the crew, for he had sailed many years in +the waters over which they were flying, and was able to give the +professor many valuable hints. He had heard vague stories of the island +with the big hole, but had never been near it. He did not make the trip +however, as, at his request, he was put off at an inhabited island one +night. + +It was about a week after the sailors were frightened from the ship, +that a curious experience befell Mark. Washington was on duty in the +conning tower, attending to the apparatus as the ship flew through the +air, and all the others had gone to bed. Mark had remained up, later +than the others as he was interested in reading a book on science. + +About ten o'clock he became hungry, and going to the pantry got some +bread and cold meat. He set these on a table, and then, remembering he +would need some water to drink, started after some in the cooler, which +was in a little room near the tower. + +Washington heard the boy as he turned the faucet to draw the liquid, and +spoke to him, as the colored man was rather lonesome at his post. Mark +did not linger more than a minute or two, but when he returned to where +he had left the food he was much surprised. + +There was not a trace of it to be seen. The dishes were on the table, +but every vestige of bread and meat had disappeared. + +"I wonder if a cat or dog has been here," was Mark's first thought. Then +he remembered that no such animals were aboard the _Mermaid_. + +Something on the floor caught his eye. He stooped and picked it up. It +was a slice of bread, but in such shape that the boy stared at it, +puzzled as to how it could have become so. + +It was flattened out quite thin, but the strangest part of it was that +it bore what seemed to be the marks of thumb and fingers from a very +large hand. So big, in fact, was the print, that Mark's hand scarce +covered half of it, and, where the bread had been squeezed into a putty +like mass (for it was quite fresh) the peculiar markings on the skin of +the tips of the fingers were visible. + +"It looks as if a giant grabbed this slice of bread," Mark observed. +"There are strange happenings aboard this ship. I wish I knew what they +meant." + +He looked all around for the food, thinking perhaps a rat had dragged it +off, but there was no trace of it. + +Suddenly the boy thought he heard a sound from the big storeroom. He was +almost sure he heard something moving in there. He started toward the +door when he was stopped by hearing the professor's voice call: + +"Don't open that door, Mark. Have I not told you that place must not be +entered?" + +"I thought I heard some one in there," Mark replied. + +"There is nothing in there but some apparatus of mine," Mr. Henderson +said. "I want no one to see it. What is the matter?" + +Mark explained matters to the scientist, who had, as he said later, +arisen on hearing the boy moving about. + +"Oh, it was a rat that took your stuff," Mr. Henderson said. "I guess +there are some pretty big ones on the ship. Get some more food and go to +sleep." + +Mark felt it best to obey, though he was by no means satisfied with the +professor's explanation. He listened intently to see if any more noises +came from the storeroom, but none did, and he went to bed. + +Several times after that Mark tried the experiment of leaving food +about. On each occasion it was taken. + +"It looks as if the ship was haunted," he said. "Of course I know it +isn't, but it's very queer. They must be strange rats that can get food +from shelves when there is only the smooth side of the ship to climb +up," for on some occasions Mark had tried the experiment of putting the +food as nearly out of reach as possible. + +It took several nights to learn all this, and, as he did not want to +take any one into his confidence, he had to work in secret. But, with +all his efforts he learned nothing, save that there was something odd +about the ship that he could not fathom. + +At first he believed the professor had some strange animal concealed in +the storeroom, but he dismissed this idea almost as soon as he thought +of it. For what could the scientist want with an animal when they were +going to the interior of the earth? That some beast had slipped aboard +was out of the question. Mark was much puzzled, but finally, deciding +the matter did not concern him a great deal, gave up trying to solve the +mystery, at least for a time. + +The ship was now in the neighborhood of the equator and the climate had +become much warmer. So hot indeed were some nights that they slept out +on deck, with the _Mermaid_ flying through the air at a moderate pace, +for it was deemed best not to go at any great speed after dark. + +One night the professor, after consulting various charts and maps, and +making calculations which covered several sheets of paper announced: + +"We should sight the mysterious island to-morrow." + +"That's good news!" exclaimed Jack. "I'm anxious to see what's below +inside of that big hole." + +"Everybody git ready for their funerals!" exclaimed Washington in a deep +voice. "I ain't got many----" + +"Cheer up," interrupted Jack, poking Washington in the ribs. The colored +man was very ticklish, and he began to laugh heartily, though, perhaps, +he did not feel like it. + +Suddenly, above the sound of his shouts, there came a crashing, grinding +noise from the engine room. + + + + + CHAPTER XII + + THE BIG HOLE + + +"Something has gone wrong!" exclaimed the professor as he jumped up. He +reached the engine room ahead of any one else, and when the two boys got +there they found him busy twisting wheels and shifting levers. + +"Anything serious?" asked Jack. + +"It's the gas machine again," Mr. Henderson replied. "It broke where we +fixed it. However it doesn't matter. I was going to lower the ship +anyhow, as I want to approach the island from the water. We will go down +a little sooner than I counted on." + +The disabling of the gas machine caused the vapor to escape slowly from +the tank, and this made the ship sink gradually. By means of the +emergency stop-cock the descent could be controlled almost as well as +though the machinery was in working order. Half an hour later the +_Mermaid_ rested on the water. + +It was a little rough, as there was quite a swell on, and not so +pleasant as floating in the air on an even keel, but they made the best +of it. + +On account of the little accident, and not being certain of its extent, +it was deemed best not to send the ship ahead. So they laid to until +morning. + +For the better part of two days all those on board the _Mermaid_ had +their hands full mending the break and making other repairs found +necessary. In that time they lay to, floating idly with the currents, or +blown by the wind, for the professor would not start any of the engines +or apparatus until the ship was in good condition. + +In this time Mark had several times recalled the curious happenings in +regard to the disappearing food, and the mystery of the storeroom. But +there were no further manifestations, and no other signs that there +might be a strange visitor aboard. + +"I couldn't have imagined it all," said Mark, "but I guess what did +happen may have been caused by natural means, only I can't discover +them." + +It was about two days after this, the ship having sailed scores of miles +on the surface of the water, that Mark, who was in the conning tower +exclaimed: + +"That looks like a waterspout ahead of us." + +"That's what it is!" Jack agreed. "What shall we do?" + +"Call the professor!" said Mark. "He'll know." + +When Mr. Henderson came, he looked for a long time at a cloud of black +vapor which hung low in the east. + +"It may be a waterspout," he said. "We'll rise in the air and see if we +can avoid it." + +The ship was sent up into the air. As it rose higher and higher, the +professor, making frequent observations from his conning tower, cried +out: + +"That is no waterspout!" + +"What is it?" asked Mark. + +"It is the steam and vapor rising from the big hole in the earth! Boys, +we are almost there!" + +"Are you sure that's it?" asked Mark. + +"Almost positive," Mr. Henderson replied. "You can see how much warmer +it has become of late, as we approached the equator. We are almost due +at the island, and I have no doubt we have reached it." + +As the ship flew forward the mass of dark vapor became more pronounced. +Through the glasses it could be noticed to consist of rolling masses of +clouds. What lay beneath them no one knew. The adventurers were going to +try to find out. + +Now that they had arrived at the beginning of the main part of their +journey, the travelers felt their spirits sink a little. It was one +thing to plan to go down into the depths of the earth, but it was quite +another to make the actual attempt. Still, they were not going to give +up the project. The professor had confidence in his ship and believed it +could safely make the trip. Still it was with no little apprehension +that Mr. Henderson watched the nearer approach of the craft to that +strange island. + +"Perfesser, are yo' really an' truly goin' t' depress this elongated +spheroid an' its human consignment int' that conglomerous convoluted +mass of gaseous vapor regardless of th' consequences?" asked Washington, +as he gazed with wide opened eyes at the sight before him. + +"If you mean am I going to let the _Mermaid_ go down into that hole you +are perfectly correct," the scientist answered, "though you could have +said it in fewer words, Washington." + +"I--I guess I'll get out an' walk," the colored man made reply. + +"This isn't any trolley car," observed Mark. "Don't lose your nerve, +Wash. Stay with us, and we'll discover a gold or diamond mine, maybe." + +"Is there diamonds down there?" asked the colored man, his fright +seeming to leave him. + +"There are all sorts of things inside the earth," the professor +answered. + +"Then I'm goin' along!" Washington declared. "I always did want a +diamond ring, an' I knows a little colored gal that wants one, too. I'm +goin' all right! This suttenly am th' most kloslosterous conjunctivity +of combativeness that I ever sagaciated!" and he began to do a sort of +impromptu cake-walk. + + + + + CHAPTER XIII + + DOWN INTO THE EARTH + + +It was now noon, but the adventurers did not think of dinner in the +excitement of approaching the mysterious island. The speed of the ship +was increased that they might the more quickly come to it. As they +approached they could see the masses of vapor more plainly, and it +appeared that some great commotion must be going on inside the big hole, +since clouds of steam arose. + +"I only hope it doesn't prove too hot for us," observed the professor. +"However, I provided a water jacket for the ship, and we may need it, as +well as the vacuum chambers to keep the heat from us." + +It was about three o'clock when the flying ship reached the edge of the +island. From there it was about a mile to the rim of the big hole, over +one side of which the waters of the ocean poured with a roar that could +be heard over half a mile off. + +"I think we had better halt and see that everything is in good shape +before proceeding," said Mr. Henderson. "Jack, you and Mark make a +thorough inspection of the engine room, and see that all the apparatus +is in working order." + +The two boys prepared to do as they were told. Mark, who was walking a +little ahead of Jack, entered the apartment from which the storeroom +opened. As he did so he saw, or thought he saw, the door of the place +where the extra supplies were kept, close. Without saying anything to +Jack he hurried forward, and tried the knob. It would not turn. + +"That's funny," said Mark to himself. "I could almost swear I saw some +one go into that room. Yet I know the professor did not enter, for I +just left him. And none of the others would dare to. I wonder if I will +ever solve the mystery." + +But he had too much to do to allow him to dwell on that matter. Several +of the dynamos needed adjusting and for two hours he and Jack had all +they could do. + +In the meanwhile the professor had gone over the other parts of the +ship, and gotten everything in readiness for the descent. The _Mermaid_ +was lowered to within a few hundred feet of the sea, and, through a hose +that was let down, the compartments, provided for this emergency were +filled with water. These compartments were between the outer and inner +hulls of the lower part of the craft, and were designed to prevent the +interior becoming heated in case the travelers found they had to pass +close to fire. There were also vacuum chambers, and from these the air +was exhausted, as of course every schoolboy knows a vacuum is a +non-conductor of either heat or cold. + +"Now I think we are ready," the professor announced at length. + +"Everything's all right in the engine room," announced Jack. + +"Yes, an' everything's all right in th' kitchen," put in Washington. +"I've got a good meal ready as soon as any one wants to eat." + +"It will have to wait a while," Mr. Henderson remarked. "We are going to +start to make the descent before we dine." + +The hose was reeled up, and the ship was sent a few hundred feet higher +into the air, as Mr. Henderson wanted to take a last good observation +before he went down into the hole. + +But having risen some distance above the masses of rolling vapors he +found he was at no advantage, since the strongest telescope he could +bring to bear could not pierce the cloud masses. + +"We'll just have to trust to luck," the scientist said. "I judge we're +about over the centre of the opening. Lower away Mark!" + +The boy, who, under the watchful eye of the professor, was manipulating +the levers and wheels in the conning tower, shifted some handles. The +gas was expelled from the holder, the negative gravity apparatus ceased +to work, and the _Flying Mermaid_ sank lower and lower, toward the +mysterious hole that yawned beneath her. + +The hearts of all beat strangely, if not with fear, at least with +apprehension, for they did not know what they might encounter. Perhaps +death in some terrible form awaited them. But the desire to discover +something new and strange had gripped all of them, and not one would +have voted to turn back. + +Even old Andy, who seldom got excited, was in unusual spirits. He took +down his gun and remarked: + +"Maybe I can kill some new kind of animal, and write a book about its +habits, for surely we will see strange beasts in the under-world." + +Lower and lower sank the ship. Now it was amid the first thin masses of +vapors, those that floated highest and were more like a light fog, than +anything else. By means of a window in the bottom of the craft, which +window was closed by a thick piece of plate glass, Professor Henderson +could look down and see what was beneath them. + +"The clouds seem to be getting thicker," he said, as he peered through +the small casement. "If they would only clear away we could see +something." + +But instead of doing this the vapors accumulated more thickly about the +ship. It was so dark inside the _Mermaid_ now that the electric lights +had to be switched on. In the room with the floor-window the lights were +not used, as had they shone one could not have seen down below. + +The professor maintained his position. The descent was a perilous one, +and he wanted to be on the watch to check it at once if the _Mermaid_ +was liable to dash upon some pointed rock or fall into some fiery pit. +His hand was on the signal levers. + +Suddenly he looked up and glanced at a gage on the wall. The hand of it +was slowly revolving. + +"We are at the earth's surface," the scientist said. "Now we are below +it. Now we are fairly within the big hole! Boys, we may be on the verge +of a great discovery!" + +An instant later it seemed as if a hot wave had struck the _Mermaid_, or +as if the craft had been plunged into boiling water. + +"It's going to be hot!" cried the professor. "Lucky I provided the water +jackets!" + +Then the lights in the interior of the ship went out, leaving the whole +craft in darkness. + +"What has happened?" cried Mark. + + + + + CHAPTER XIV + + MANY MILES BELOW + + +"Don't be alarmed," spoke the calm voice of the professor. "I have only +turned off the electrics. I want to switch on the search lights, to see +if we can learn anything about our position." + +As he spoke he turned a switch, and, the gloom below the ship, as the +boys could see by glimpses from the floor-window, was pierced by a +dazzling glare. In the bottom of the _Mermaid_ were set a number of +powerful electric arc lights with reflectors, constructed to throw the +beams downward. The professor had built them in for just this emergency, +as he thought that at some time they might want to illuminate what was +below the craft. + +Not that it was of much avail on this occasion, for, though the lights +were powerful, they could not pierce the miles of gloom that lay below +them. The beams only served to accentuate the darkness. + +"I guess we'll have to trust to luck," the professor said, after a vain +attempt, by means of powerful glasses, to distinguish something. "There +is too much fog and vapor." + +"What makes it so warm?" asked Mark, removing his coat. + +"Well, you must remember you are approaching the interior of the earth," +the professor answered. "It has been calculated that the heat increases +one degree for every fifty-five feet you descend. We have come down +several hundred feet and of course it is getting warmer." + +"Then if we go down very far it will get so hot we will not be able to +stand it," Jack put in. + +"I do not believe we will suffer any great inconvenience," Mr. Henderson +went on. "I believe that after we pass a certain point it will become +cooler. I think the inner fires of the earth are more or less heated gas +in a sort of inner chamber between two shells. If we can pass the second +shell, we will be all right." + +"But aren't we liable to hit something, going down into the dark this +way?" asked Mark. + +"We will guard ourselves as far as possible," the scientist answered. + +The _Mermaid_ seemed to be going down on a side of the immense shaft a +good way distant from the strange waterfall. When they had first dropped +into the hole the travelers could hear the rush of waters, but now the +noise was not audible. + +"I think the hole must widen out the farther down we go," the professor +said. "We are probably many miles from the fall now." + +"I'm sure I hope so," put in Jack. "It would be no fun to have to take a +shower bath in this place." + +After a meal, the boys and the professor took some more observations, +but with all their efforts nothing could be seen below the ship but a +vast black void, into which they were steadily descending. + +"I wonder when we're going to stop," asked Mark. "It's like playing the +game 'Going to Jerusalem,' you keep wondering when the music will cease +and you will have a chance to grab a chair. I only hope we have a chair +or something else to sit on, in case we go to smash." + +"We're not liable to have any accidents with the professor in charge," +Jack answered. "Didn't he bring us safe out of some pretty tight holes +when we went to the north pole in the airship, and again when we found +the south pole in the submarine?" + +"Yes, but this is different," objected Mark. + +"Well, I'm not worrying," Jack went on. "It doesn't do any good, and +only makes you lie awake nights. By the way, I wonder what time it is +getting to be." + +He looked at his watch and found it was close on to eight o'clock in the +evening. So late had dinner been served, and so varied were the +happenings of the last few hours, that time had passed quickly. + +"Why it's almost bed-time," said Jack. "I wonder if we are to go on +dropping into the depths of nowhere all night." + +At that moment the professor entered the room where the boys were. He +seemed quite pleased over something, and was smiling. + +"Everything is going along famously," he said. "I have just tested the +air and find it is rich in oxygen. We shall suffer nothing on that +score. The heat too, seems to have decreased. On the whole, everything +favors us." + +"Are we going on down?" asked Mark. + +"As far as we can," Mr. Henderson answered. "Let me see how far we are +below now." + +He went to the gage that indicated the vertical position of the ship. +Because of the changed conditions, the craft now sinking below the +surface of the earth instead of rising above it, as was its wont, some +calculations were necessary. These the scientist made as quickly as he +could. + +"We are now ten miles underground!" he exclaimed. "That is doing very +well. My theories are working out. I think we shall land somewhere +before long." + +"I hopes so!" exclaimed Washington coming in at this point. "I'm mighty +skeered shootin' down int' this dark hole, and no time-table t' show +when we's due t' arrive." + +"We ought to land in a couple of days more," the professor answered. +"Never mind about worrying Washington, I'll take care of you." + +"I hopes so, Perfesser," the colored man said. "I got a little girl +waitin' for me back in Georgia, an' I'd like t' see her 'fore I git +burned up." + +Accompanied by the professor, the boys made a tour of the ship to see +that all the machinery and apparatus were in working order. Owing to the +changed conditions the negative gravity engine had to be worked at +faster speed than usual, since the downward pull of the earth was +greater the farther they descended into the interior and they did not +want to fall too swiftly. But this was easily provided for, since the +professor had made the apparatus capable of standing a great strain. + +The ten miles had become fourteen when the professor, finding that +everything was in good shape, proposed that the boys go to bed. They did +not want to, though they were sleepy, and they feared to miss some +strange sights. + +But when the professor had promised to call them in case anything +unusual developed, they consented to turn in, and Bill and Tom assumed +their duties, which were light enough, now that the ship was merely +falling into the immense shaft. + +When Mark turned into his bunk he could not go to sleep at once. It may +have been the excitement over their new position, or because he had +eaten too hearty a supper, but the fact was he remained awake for some +time. + +While thus tossing restlessly on his bed, wondering what ailed him, he +thought he heard a noise in the main apartment out of which the +storeroom opened. He crawled softly from his bed, and looked from his +stateroom door. + +In the light of a shaded electric Mark saw the figure of some one glide +across the floor and take refuge in the room, which Professor Henderson +always was so particular about. + +"I wonder what or who that was," reasoned Mark. "There is some mystery +in this. Can the professor have concealed some one on this ship whose +presence he does not want to admit? It certainly looks so." + +Not wanting to awaken the ship's crew, and remembering what Mr. +Henderson had said about any one entering the storeroom, Mark went back +to bed, to fall into an uneasy slumber. + +"Breakfast!" called Washington breaking in on a fine dream Jack was +having about being captain of a company of automobile soldiers. "Last +call for breakfast!" + +"Hello! Is it morning?" asked Jack. + +"Not so's you could notice it," Washington went on. "It's as dark as a +stack of black cats and another one throwed in. But breakfast is ready +jest the same." + +The boys were soon at the table, and learned that nothing of importance +had occurred during the night. The _Mermaid_ had been kept going slowly +down, and about seven o'clock registered more than fifty miles below the +earth's surface. + +Still there was no change in the outward surroundings. It remained as +black as the interior of Egypt when that country was at its darkest. The +powerful electrics could not pierce the gloom. The ship was working +well, and the travelers were very comfortable. + +Down, down, down, went the _Mermaid_. The temperature, which had risen +to about ninety went back to sixty-nine, and there seemed to be no more +danger from the inner fires. + +They were now a hundred miles under the surface. But still the professor +kept the _Mermaid_ sinking. Every now and again he would take an +observation, but only found the impenetrable darkness surrounded them. + +"We must arrive somewhere, soon," he muttered. + +It was about six o'clock that night that the alarm bell set up a sudden +ringing. The professor who was making some calculations on a piece of +paper jumped to his feet, and so did a number of the others. + +"We are nearing the bottom!" he cried. "The bell has given us warning!" + + + + + CHAPTER XV + + IN THE STRANGE DRAUGHT + + +The boys ran to attend to the engines and apparatus to which they had +been assigned in view of this emergency. The professor, Washington, +Bill, Tom and Andy, who had kept to themselves since the descent, came +running out of the small cabin where they usually sat, and wanted to +know what it was all about. + +"We may hit something, in spite of all precautions," Mr. Henderson +remarked. "Slow down the ship." + +The _Mermaid_ was, accordingly checked in her downward flight, by a +liberal use of the gas and the negative gravity machine. + +The bell continued to ring, and the dials pointed to the mark that +indicated the ship was more than one hundred and fifty miles down. + +Mark, who had run to the engine room to check the descent, came back. + +"Why didn't you slow her down?" asked the professor. + +"I did," replied the boy. "The negative gravity and the gas machines are +working at full speed." + +"Then why are we still descending?" asked the scientist. "For a while +our speed was checked, but now we are falling faster than before." + +"I attended to the apparatus," Mark insisted. + +Just then, from without the ship, came a terrible roaring sound, as +though there was a great cyclone in progress. At the same time, those +aboard the craft could feel themselves being pulled downward with +terrific force. + +"We are caught in a draught!" Mr. Henderson cried. "We are being sucked +down into the depths of the earth!" + +He ran to the engine room. With the help of the boys he set in motion an +auxiliary gravity machine, designed to exert a most powerful influence +against the downward pull of the earth. As they watched the great wheels +spin around, and heard the hum and whirr of the dynamos, the boys +watched the pointer which indicated how low they were getting. + +And, as they watched, they saw that the needle of the dial kept moving, +moving, moving. + +"Our efforts are useless! We can't stop!" the professor cried. + +Grave indeed was the plight of the adventurers. In their ship they were +being sucked down into unknown regions and all their efforts did not +avail to save them. It was an emergency they could not guard against, +and which could not have been foreseen. + +"What are to do?" asked Mark. + +"We can only wait," Mr. Henderson replied. "The terrible suction may +cease, or it may carry us to some place of safety. Let us hope for the +best." + +Seeing there was no further use in running the engines in an effort to +check the downward rush the machines were stopped. Then they waited for +whatever might happen. + +Now that they seemed in imminent peril Washington was as cool as any +one. He went about putting his kitchen in order and getting ready for +the next meal as if they were sailing comfortably along on the surface +of the ocean. As for old Andy he was nervous and frightened, and plainly +showed it. With his gun in readiness he paced back and forth as if on +the lookout for strange beasts or birds. + +Bill and Tom were so alarmed that they were of little use in doing +anything, and they were not disturbed in their staterooms where they +went when it became known that the ship was unmanageable. + +The boys and the professor, while greatly frightened at the unexpected +turn of events, decided there was no use in giving way to foolish alarm. +They realized they could do nothing but await developments. + +At the same time they took every precaution. They piled all the bedding +on the floor of the living room, so that the pillows and mattresses +might form a sort of pad in case the ship was dashed down on the bottom +of the big hole. + +"Not that it would save us much," Jack observed with a grim smile, "but +somehow it sort of makes your mind easier." + +All this while the ship was being sucked down at a swift pace. The +pointer of the gage, indicating the depth, kept moving around and soon +they were several hundreds of miles below the surface of the earth. + +The professor tried, by means of several instruments, to discover in +which direction they were headed, and whether they were going straight +down or at an angle. But some strange influence seemed to affect the +gages and other pieces of apparatus, for the pointers and hands would +swing in all directions, at one time indicating that they were going +down, and, again, upward. + +"There must be a strong current of electricity here," Mr. Henderson +said, "or else there is, as many suspect, a powerful magnet at the +center of the earth, which we are nearing." + +"What will you do if the ship is pulled apart, or falls and is smashed?" +asked Mark with much anxiety. + +"You take a cheerful view of things," said Jack. + +"Well, it's a good thing to prepare for emergencies," Mark added. + +"If the ship was to be separated by the magnetic pull, or if it fell on +sharp rocks and was split in twain, I am afraid none of us could do +anything to save ourselves," the professor answered. "Still, if we were +given a little warning of the disaster, I have means at hand whereby we +might escape with our lives. But it would be a perilous way of----" + +"I reckon yo' all better come out an' have supper," broke in Washington. +"Leastways we'll call it supper, though I don't rightly know whether +it's night or mornin'. Anyhow I've got a meal ready." + +"I don't suppose any of us feel much like eating," observed Mr. +Henderson, "but there is no telling when we will have the chance again, +so, perhaps, we had better take advantage of it." + +For a while they ate in silence, finding that they had better appetites +than they at first thought. Old Andy in particular did full justice to +the food Washington had prepared. + +"I always found it a good plan to eat as much and as often as you can," +the hunter remarked. "This is a mighty uncertain world." + +"You started to tell us a little while ago, Professor," said Mark, +"about a plan you had for saving out lives if worst came to worst, and +there was a chance to put it into operation. What is it?" + +"I will tell you," the aged inventor said. "It is something about which +I have kept silent, as I did not want to frighten any of you. It was my +latest invention, and I had only perfected it when we started off on +this voyage. Consequently I had no chance to try it. The machine works +in theory, but whether it does in practice is another question. That is +why I say there is a risk. But we may have to take this risk. I have +placed aboard this ship a----" + +The professor was interrupted in what he was about to say by a curious +tremor that made the whole ship shiver as though it had struck some +obstruction. Yet there was no sudden jolt or jar such as would have been +occasioned by that. + +At the same time Washington, who was out in the kitchen, came running +into the dining room, crying: + +"We're droppin' into a ragin' fire, Perfesser!" + +"What do you mean?" asked Mr. Henderson. + +"I jest took a look down through th' hole in th' bottom of the ship!" +cried Washington. "It's all flames an' smoke below us!" + +"I wonder if it is the end," the professor muttered in a low voice. + +Followed by the boys, the inventor hastened to the floor-window. The +lights were turned off to enable a better view to be had of what was +below them. + +Leaning over the glass protected aperture the boys and the professor +saw, far, far down, a bright light shining. It was as if they were miles +above a whole town of blast furnaces, the stacks of which were belching +forth flames and smoke. The rolling clouds of vapor were illuminated by +a peculiar greenish light, which, at times, turned to red, blue, purple +and yellowish hues. + +The effect was weird and beautiful though it was full of terror for the +travelers. It seemed as if they were falling into some terrible pit of +fire, for the reflection of what they feared were flames, could plainly +be seen. + +"I wish I'd never come on this terrible voyage!" wailed Washington. "I'd +rather freeze to death than be burned up." + +"Washington, be quiet!" commanded the professor sternly. "This is no +time for foolishness. We must work hard to save our lives, for we are in +dire peril. + +"Mark, you and Washington, with Jack, start the engines. Turn on every +bit of power you can. Fill the gas holder as full as it will hold, and +use extra heavy pressure. I will see if I can not work the negative +gravity apparatus to better advantage than we did before. We must escape +if possible!" + +The boys, as was also Washington, were only too glad to have something +to do to take their mind off their troubles. All three were much +frightened, but Mark and Jack tried not to show it. As for Washington he +was almost crying. + +Soon the whirr and hum of the machinery in the _Mermaid_ was heard. The +craft, which was rushing in some direction, either downward, ahead or +backwards within the unknown depths, shivered from the speed of the +dynamos and other apparatus. Soon the boys could hear the professor +starting the negative gravity engine, and then began a struggle between +the forces of nature and those of mankind. + +Once more the adventurers anxiously watched the gages and indicators. +For a while the ship seemed to be holding out against the terrible +influence that was sucking her down. She appeared to hesitate. Then, as +the downward force triumphed over the mechanical energy in the craft, +she began to settle again, and soon was descending, if that was the +direction, as fast as before. + +"It is of no use," said the professor with a groan. "I must try our last +resort!" + +He started from the engine room where Mark and Jack had gone. As he did +so, he glanced at a thermometer hanging on the wall near the door. + +"Has any one turned on the heat?" he asked. + +"It's shut off," replied Mark, looking at the electric stove. + +"Then what makes it so hot?" asked the scientist. + +He pointed to the little silvery column in the tiny tube of the +instrument. It registered close to one hundred degrees, though a few +minutes before it had been but sixty. And the starting of the machinery +could not account for the rise in temperature, since most of the +apparatus was run by electricity and developed little heat save in the +immediate proximity. The thermometer was fully ten feet away from any +machine. + +"It's the fiery furnace that's doing it!" cried Washington. "We're +falling into th' terrible pit an' we're goin' t' be roasted alive!" + +"It certainly is getting warmer," observed Mark, as he took off his +coat. Soon he had to shed his vest, and Jack and the professor followed +his example. The others too, also found all superfluous garments a +burden, and, in a little while they were going about in scanty attire. + +Still the heat increased, until it was almost torture to remain in the +engine room. Nor was it much cooler elsewhere. In vain did the professor +set a score of big electric fans to whirring. He even placed cakes of +ice, from the small ice machine that was carried, in front of the +revolving blades, to cool off the air. But the ice was melted almost as +soon as it was taken from the apparatus. + +"Them flames is gittin worser!" Washington cried a little later. "We's +comin' nearer!" + +From the bottom window the professor and the boys looked down. True +enough the curious, changing, vari-colored lights seemed brighter. They +could almost see the tongues of flame shooting upward in anticipation of +what they were soon to devour. + +The heat was increasing every minute. The sides of the ship were hot. +The heads of the travelers were getting dizzy. They could hardly talk or +move about. + +"I must save our lives! I must trust to the----" The professor, who was +muttering to himself started toward the storeroom. As in a dream Mark +watched him. He remembered afterward that he had speculated on what +might be the outcome of the mystery the professor threw about the place. +"I will have to use it," he heard the scientist say softly. + +Just as Mr. Henderson was about to open the door there came a fiercer +blast of heat than any that had preceded. At the same instant the +conditions in the _Mermaid_ became so fearful that each of the travelers +felt himself fainting away. + +"Go to--storeroom--get cylinder--get in----" the professor murmured, and +then he fell forward in a faint. + + + + + CHAPTER XVI + + THE NEW LAND + + +"What is it? Tell us!" exclaimed Jack, almost in his last breath, for, a +few seconds later he too toppled over senseless. Then Washington went +down, while Andy, Bill and Tom succumbed to the terrible heat. + +Mark felt his head swimming. His eyes were almost bulging from their +sockets. He dimly remembered trying to force himself to go to the +storeroom and see what was there. He started toward it with that +intention, but fell half way to it. + +As he did so he saw something which impressed itself on his mind, half +unconscious as he was. + +The door of the storeroom suddenly opened, and from it came a giant +shape, that seemed to expand until it filled the whole of the apartment +where the stricken ones lay. It was like the form of some monster, half +human, half beast. Mark shuddered, and then, closing his eyes, he felt +himself sinking down into some terrible deep and black pit. A second +later the whole ship was jarred as though it had hit something. + +How long he and the others remained unconscious Mark did not know. He +was the first to revive, and his first sensation was one as though he +had slept hard and long, and did not want to get up. He felt very +comfortable, although he was lying flat on the floor, with his head +jammed against the side of a locker. It was so dark that he could not +distinguish his hand held close to his face. + +"I wonder if I'm dead, and if all the others are dead too," he thought +to himself. "What has happened? Let's see, the last I remember was some +horrible shape rushing from the storeroom. I wonder what it could have +been? Surely that was not the secret the professor referred to." + +Mark shuddered as he recalled the monster that seemed to have grown more +terrible as each second passed. Then the boy raised himself up from his +prostrate position. + +"Well, at any rate, some one has turned off the heat," he murmured. +"It's very comfortable in here now. I wish I could strike a light." + +He listened intently, to learn if any of the others were moving about. +He could hear them breathing, but so faintly as to indicate they were +insensible. Mark stretched out his hand and felt that some one was lying +close to him, but who of the adventurers it was he could not determine. + +"If only the dynamo was working we could have light," he said. "But it +seems to have stopped," and, indeed there was a lacking of the familiar +purr and hum of the electrical machine. In fact none of the apparatus in +the ship was working. + +"The storage battery!" exclaimed Mark. "That would give light for a +while, if I can only find the switch in the dark." + +He began crawling about on his hands and knees. It was so intensely +black that he ran into many things and received severe bruises. At last +he came to a doorway, and as he did so his hand came in contact with an +easy chair. It was the only one aboard, and by that he knew he had +passed into the sitting room. He had his general direction now, and knew +if he kept straight on he would come to the engine room. There he was +familiar enough with the apparatus and levers to be able to turn the +electric switch. + +Crawling slowly and cautiously, he reached the room where all the +engines were. Then he had to feel around the sides to locate the switch. +At length he found it. There was a click, a little flash of greenish +fire, and the copper conductors came together, and the ship was flooded +with the glow from the incandescents. + +Mark hurried back to where the others were lying. They were still +unconscious, but an uneasy movement on the part of Jack told that he was +coming out of the stupor. Mark got some ammonia and held it beneath his +comrade's nose. The strong fumes completed the work that nature had +started and Jack opened his eyes. + +"Where am I? What has happened? Are any of them dead?" he asked quickly. + +"I hope no one is dead," Mark replied. "As to the other question, I +can't answer. I don't know whether we are a thousand miles underground, +or floating on the ocean, though I'm more inclined to the former theory. +But never mind that now. Help me to bring the others back to their +senses. I'll work on the professor and you can begin on Bill or Tom. +Washington seems to be all right," for at that moment the colored man +opened his eyes, stared about him and then got up. + +"I thought I was dead for suah!" he exclaimed. + +"Some of the others may be if we don't hurry," said Mark. "Get to work, +Wash!" + +With the colored man to help them the two boys, by the use of the +ammonia, succeeded in reviving Bill, Tom and old Andy. But the +professor, probably on account of his advanced age, did not respond so +readily to the treatment. The boys were getting quite alarmed, as even +some of the diluted ammonia, forced between his lips, did not cause him +to open his eyes, or increase his heart action. + +"If he should die, and leave us all alone with the ship in this terrible +place, what would we do?" asked Jack. + +"He's not going to die!" exclaimed Mark. "Here I have another plan. +Washington bring that medical electrical battery from the engine room." +This was a small machine the professor had brought along for +experimental purposes. + +Quickly adjusting it, Mark placed the handles in the nerveless fingers +of Mr. Henderson. Then he started the current. In about a minute the +eyelids of the aged inventor began to quiver, and, in less than five +minutes he had been revived sufficiently to enable him to sit up. He +passed his hand across his forehead. + +"What has happened?" he asked in a faint voice. + +"I don't know; none of us knows," Mark answered. "We all lost our senses +when it got so hot, and there seemed to be some peculiar vapor in the +air. The last I remember was seeing some horrible shape rush from the +storeroom, soon after the ship struck. Then I fainted away. When I woke +up I managed to turn the lights on, and then I came back here." + +"I wonder where we are," the old man murmured. "I must find out. We must +take every precaution. Washington, go and look at the gage indicating +our depth." + +The colored man was gone but a few seconds. When he returned his eyes +were bulging in terror. + +"What is it?" asked Mr. Henderson, who, thanks to the battery, had +almost completely recovered. + +"It ain't possible!" gasped Washington. "I'll never believe it!" + +"What is it?" asked Mr. Henderson, while the others waited in anxiety +for the answer. + +"We're five hundred miles down!" declared Washington. + +"Five hundred miles!" muttered the inventor. "It does not seem possible, +but it must be so. We fell very rapidly and the terrible draught sucked +us down with incredible rapidity. But come, we must see what our +situation is, and where we are. We are stationary, and are evidently on +some solid substance." + +They all felt much recovered now, and, as the terrible fright of being +consumed in a fiery furnace had passed, they all were in better spirits. + +At the suggestion of the professor, the boys and Washington made a tour +of the ship. They found, for some unaccountable reason, that nearly all +the engines and apparatuses were out of gear. In some the parts had +broken, and others were merely stopped, from the failure of some other +machine, on which they were dependent. + +"I'm afraid this is the end of the _Mermaid,"_ said Mark, in a sorrowful +tone. + +"Nonsense!" replied Jack, who was of a more cheerful nature. "Things are +not so bad as they look. The professor can fix everything." + +"I'm sure I hope so," Mark went on, not much encouraged, however, by +Jack's philosophy. "It would be no joke to have to stay five hundred +miles underground the rest of our lives." + +"You don't know," retorted Jack. "Don't judge of a country you've never +seen. This may be as fine a place as it is on the surface of the earth. +I want a chance to see it," and Jack began to whistle a cheerful tune. + +They completed the tour of the ship, and found, that, aside from the +damage to the machinery, the _Mermaid_ had not sustained any harm. The +hull was in good order, though of course they could not tell about the +gas holder. It was not possible to see this except by going into the +conning tower or out on the small deck, and this they did not venture to +do. The connections between the holder and the main ship seemed to be +all right, and there was still a small quantity of gas in the big tank, +as Mark found on opening a stop-cock. + +They went back to the professor and told him what they had observed. He +seemed somewhat alarmed, the more so as the experience he had just +passed through had weakened him considerably. + +"I hope I shall be able to make the repairs," he said. "It is our only +hope." + +As he spoke he looked up at the electric lights that shone overhead from +wall brackets. + +"Who is shutting down the power?" he asked. + +"There is no power on, Professor," replied Mark. "I am running the +lights from the storage battery. But something is the matter, for they +are growing dim." + +The filaments were now mere dull red wires, and the ship was being +shrouded in gloom again. + +"The battery is failing!" exclaimed Mr. Henderson. "We shall be left in +darkness, and there is no other way to produce light. I ought to have +brought some lamps or candles along in case of emergency." + +The next instant the _Mermaid_ became as black as Egypt is popularly +supposed to be, and something like an exclamation of terror came from +the professor. + +For several minutes they all sat there in the blackness and gloom, +waiting for they knew not what. Then, suddenly, there sounded throughout +the ship, a creaking as of metal sliding along metal. Some big lever +creaked, and, a second later the whole place was flooded with light. + +"What has happened?" cried the professor, starting to his feet in alarm. + +"We are going to be burned up!" exclaimed old Andy. + +"It's all right! It's all right!" yelled Washington from the engine room +where the boys had left him. "Don't git skeered! I done it! I opened the +port holes, by yanking on the lever. Golly, but we's arrived at the new +land! Look out, everybody!" + + + + + CHAPTER XVII + + A STRANGE COUNTRY + + +They all ran to the port holes, which were openings in the side of the +ship. They were fitted with thick, double glass, and covered on the +outside with steel shutters. These shutters were worked by a single +lever from the engine room, so that one person could open or close them +in a second or two. Washington, by accident, it appeared later, had slid +back the protecting pieces of steel, and the rest followed. + +As the adventurers looked from the glass ports they saw that the light +which had flooded the ship came from without. They were in the midst of +a beautiful glow, which seemed to be diffused about them like rays from +a sun. + +Only, in place of being a yellow or white light, such as the sun gives +off at varying times, the glow was of violet hue. And, as they watched, +they saw the light change color, becoming a beautiful red, then blue, +and again green. + +"Well, this is certainly remarkable!" the professor said. "I wonder what +causes that." + +"We've arrived! We're here, anyhow!" Washington cried, coming into the +room. "See the country!" + +Then, for the first time, the travelers, taking their attention from the +curious light that was all around them, saw that they had indeed +arrived. They were on a vast plain, one, seemingly, boundless in extent, +though off to the left there was a range of lofty mountains, while to +the right there was the glimmer of what might be a big lake or inland +sea. + +"See, we are resting on the ground!" exclaimed Jack. He pointed out of +the window, and the others, looking close at hand, noted that the +_Mermaid_ had settled down in the midst of what seemed to be a field of +flowers. Big red and yellow blossoms were all in front, and some grew so +tall as to almost be up to the edge of the port. + +"I wonder if we can be seeing aright," the professor muttered. "Is this +really the interior of the earth; such a beautiful place as this?" + +There could be little doubt of it. The ship had descended through the +big shaft, had been sucked down by the terrible air current, and had +really landed in a strange country. + +Of its size, shape and general conditions the adventurers, as yet, could +but guess. They could see it was a pleasant place, and one where there +might be the means to sustain life. For, as the professor said +afterward, he felt that where there were flowers there would be fruits, +and where both of these provisions of nature were to be found there +would likely be animal life, and even, perhaps, human beings. + +But, for the time, they were content to look from the port on the +beautiful scene that lay stretched out before them. The ship rested on +an even keel and had landed so softly that none of the plates were +strained. + +"We have plenty of air, at all events," said the professor as he took a +deep breath. "I was afraid of that, but it seems there was no need. The +air appears to be as good and fresh as that on the surface of the earth, +only there is a curious property to it. It makes one feel larger. I +imagine it must be thinner than the air of the earth, which is a rather +strange thing, since the higher one goes the more rarefied the air +becomes, and the lower, the more dense. Still we can not apply natural +philosophy to conditions under the earth. All the usual theories may be +upset. However, we should be content to take things as we find them, and +be glad we were not dashed to pieces when the ship was caught in the +terrible current." + +"What do you suppose caused the awful heat, and then made it go away +again?" asked Jack. + +"I can only make a guess at it," Mr. Henderson answered. "There are many +strange things we will come across if we stay here long, I believe. As +for the fire I think we must have passed a sort of interior volcano." + +"But what sort of a place do you think we have come to, Professor?" +asked Mark. + +"It is hard to say," the scientist replied. "We are certainly somewhere +within the earth. Our gage tells us it is five hundred miles. That may +or may not be correct, but I believe we are several hundred miles under +the crust, at all events. As to what sort of a place it is, you can see +for yourselves." + +"But how is it we can breathe here, and things can grow?" asked Bill, +who was beginning to lose his fright at the thought of being practically +buried alive. + +"I do not know what makes such things possible," Mr. Henderson replied, +"but that there is air here is a certainty. I can hardly believe it is +drawn from the surface of the earth, down the big hole, and I am +inclined to think this place of the under-world has an atmosphere of its +own, and one which produces different effects than does our own." + +"They certainly have larger flowers than we have," said Mark. "See how +big they grow, and what strong colors they have." + +He pointed to the port, against which some of the blooms were nodding in +the wind that had sprung up, for, in spite of the many differences, the +under-world was in some respects like the upper one. + +"Probably the difference in the atmosphere accounts for that," the +professor said. "It enables things to grow larger. And, by the way, +Mark, that reminds me of something you said about seeing some horrible +monster fleeing from the ship. Did you dream that?" + +"I did see something horrible, Professor," he answered. "I'm not +positive what it was, but I'll tell you as nearly as I can what it was +like." + +Thereupon Mark detailed what he had seen. + +"But how could anything, least of all some big monster, be concealed in +the storeroom, and we not know anything about it?" asked Mr. Henderson. + +"I thought you did know something of it," replied Mark. + +"Who, me? My dear boy, you must be dreaming again. Why should I want to +conceal any being in the storeroom? Come, there is something back of +this. Tell me all you know of it. I can't imagine why you think I was +hiding something in the apartment." + +"I thought so because you were always so anxious not to have me go near +it," answered the boy. "Don't you remember when you saw me going toward +it, several times, you warned me away?" + +"So I did!" exclaimed Mr. Henderson, a light breaking over his face. +"But, Mark, it was not because I had hidden some human being or animal +there. I can't tell you what it is yet, save that I can say it is merely +a machine of mine that I have invented. For reasons of my own I don't +want any one to see it yet. Perhaps it may never be seen. I thought, not +long ago, that we might have to undertake a terrible risk in escaping +from this place. I directed you to go to the storeroom--but there, I +can't say any more, my friends. Sufficient that I had nothing in the +animal line concealed there." + +"But I am certain there was some beast or human being in there," +insisted Mark. "I heard curious noises in there. Besides, how do you +account for the food disappearing and the door being open at times?" + +"It might have been rats," said Jack. + +"I don't believe there are rats in the ship," put in the professor. +"More likely it was one of us who got up hungry and took the victuals." + +"I'm sorry I can't agree with you," Mark added respectfully. "I am sure +some strange being was on board this ship, and I believe it has now +escaped. Who or what it was I can't say, but you'll find I'm right, some +day." + +"All right," spoke Mr. Henderson with a laugh. "I like to see any one +brave enough to stick up for his opinion, but, at the same time, I can't +very well imagine any person or thing being concealed in that storeroom +ever since we started. How could it get in?" + +Mark did not answer, but there came to him the recollection of that +night, previous to the sailing of the _Flying Mermaid_, when he had +observed some strange shadow that seemed to glide aboard the craft. + +"Now let's forget all about such things," the professor went on. "We are +in a strange country, and there are many things to see and do. Let's +explore a little. Then we must see what we can do with the ship. We are +dependent on it, and it will not do to allow it to remain in a damaged +state. We expect to travel many miles in the interior of the earth if it +is possible, and we have only our craft to go in." + +"I reckon we'd all better assimilate into our interior progression some +molecules and atoms of partly disentegrated matter in order to supply +combustion for the carbonaceous elements and assist in the manufacture +of red corpuscles," said Washington, appearing in the door, with a broad +grin on his good-natured face. + +"Which, being interpreted," the professor said, "means, I suppose, that +we had better eat something to keep our digestive apparatus in good +working order?" + +"Yo' done guessed it!" exclaimed the colored man, relapsing into his +ordinary speech. "I'se got a meal all ready." + +They agreed that they might not have another opportunity soon to partake +of food, so they all gathered about the table, on which Washington had +spread a good meal. + +"Come on, let's go outside and view this new and strange land at closer +quarters," the professor said, when they had satisfied their appetites. +"We can't see much from inside the ship." + +Accordingly the heavy door in the side of the _Mermaid_ was slid back, +and, for the first time the travelers stepped out on the surface of the +land in the interior of the earth. + +At first it seemed no different than the ordinary land to which they +were accustomed. But they soon found it had many strange attributes. The +queer shifting and changing light, with the myriad of hues was one of +them, but to this the adventurers had, by this time, become accustomed, +though it was, none the less, a marvel to them. It was odd enough to see +the landscape blood red one instant, and a pale green the next, as it +does when you look through differently colored glasses. + +Then, too, they noticed that the grass and flowers grew much more +abundantly than in the outer part of the world. They saw clover six feet +high, and blades of grass even taller. In some places the growth of +grass was so big that they were in danger of getting lost in it. + +"If the grass is like this, what will the trees be?" asked Mark. + +"There are some away over there," Jack replied. "We'll have to take a +sail over. They must be several hundred feet high." + +"Well, at any rate, here's a little brook, and the water looks good to +drink," went on Mark. "I'm thirsty, so here goes." + +He hurried to where a stream was flowing sluggishly between grassy +banks. The water was as clear as crystal, and Mark got down on his face +and prepared to sip some of the liquid up. + +But, no sooner had his lips touched it, than he sprang up with a cry and +stood gazing at the water. + +"What's the matter?" asked Jack. "Hot?" + +"No, it isn't hot," Mark replied, "but it isn't water. It's white +molasses!" + +"White molasses?" repeated the professor, coming up at that moment. +"What are you talking about?" + +He stooped down and dipped his finger into the stream. He drew it up +quickly, and there ran from it big drops that flowed as slowly as the +extract of the sugarcane does in cold weather. + +"You're about right, Mark," he said. "It's water but it's almost as +thick as molasses." He touched his finger to his tongue. "It's good to +drink, all right," he went on, "only it will be a little slow going +down." + +Then he dipped up a palm full, and let it trickle down his throat. + +"It is the strangest water I ever saw," he added. "It must be that the +lack of some peculiar property of air, which we have on the surface, has +caused this. I must make some notes on it," and he drew out pencil and +paper. He was about to jot down some facts when he was interrupted by a +cry from Washington. + +"Come and see what's the matter with this stone!" he cried. + + + + + CHAPTER XVIII + + CAUGHT BY A STRANGE PLANT + + +"Washington is in trouble!" exclaimed Mr. Henderson. Followed by the two +boys he ran to where the colored man stood in a stooping position over a +small pile of stones. + +"What is it? Has something bit you?" asked the scientist, as he came up +on the run. + +"No, but I can't git this stone up!" Washington said. "Look at what a +little stone it is, but I can't lift it. Something must have happened to +me. Maybe some one put th' evil eye on me! Maybe I'm bewitched!" + +"Nonsense!" exclaimed the professor, "what did you want the stone for?" + +"Nothin' in particular," replied Washington, still tugging away at the +stone, which was the size of his head. "I was just goin' t' throw it at +a big bird, but when I went to lift it this little stone 'peared t' be +glued fast." + +Washington moved aside to give Mr. Henderson a chance to try to pick up +the piece of rock. As the scientist grasped it a look of surprise came +over his features: + +"This is most remarkable!" he exclaimed. "I can't budge it. I wonder if +a giant magnet is holding it down." + +He tugged and tugged until he was red in the face. Then he beckoned to +the two boys, and they came to his aid. There was barely room for them +all to each get one hand on the rock, and then, only after a powerful +tug did it come up. Almost instantly it dropped back to the earth. + +"This is remarkable!" the professor said. "I wonder if the other stones +are the same." + +He tried several others, and one and all resisted his efforts. It was +only the small stones he was able to lift alone, and these, he said, +were so weighty that it would have been a task to throw them any +distance. + +"The water and the stones are strangely heavy in this land," he said. "I +wonder what other queer things we shall see." + +"I saw a bird a little while ago, when I went to pick up that stone," +observed Washington. + +"What kind was it?" asked the inventor. + +"I don't know, only it was about as big as an eagle." + +The travelers wandered about a quarter of a mile from the ship. They +avoided the tall grass and the lofty nodding flowers that seemed to grow +in regular groves, and kept to places where they could walk with +comparative freedom. + +"Have you formed any idea, Professor, as to the nature of this country?" +asked Mark, who liked to get at the bottom of things. + +"I have, but it is only a theory," Mr. Henderson answered. "I believe we +are on a sort of small earth that is inside the larger one we live on. +This sphere floats in space, just as our earth does and we have passed +through the void that lies between our globe and this interior one. I +think this new earth is about a quarter the size of ours and in some +respects the same. In others it is vastly different. + +"But we will not think of those things now. We must see what our +situation is, whether we are in any danger, and must look to repairing +our ship. There will be time enough for other matters later." + +The travelers were walking slowly along, noting the strange things on +every side. As they advanced the vegetation seemed to become more +luxuriant, as if nature had tried to out-do herself in providing +beautiful flowers and plants. The changing lights added to the beauty +and weirdness of the scene. + +The plain was a rolling one, and here and there were small hills and +hollows. As the travelers topped a rise Jack, who was in advance, called +out: + +"Oh what queer plants! They are giant Jacks-in-the-pulpit!" + +The others hastened forward to see what the boy had discovered. Jack was +too eager to wait, and pressed on. The hill which sloped away from the +top of the little plateau on which he stood, was steeper than he had +counted on. As he leaned forward he lost his balance and toppled, head +foremost, down the declivity, rolling over. + +"Look out!" cried Mark, who had almost reached his comrade's side. + +The scene that confronted the travelers was a strange one. Before them +in a sort of hollow, were scores of big plants, shaped somewhat like a +Jack-in-the-pulpit, or a big lily, with a curved top or flap to it. + +The plants were about eight feet tall, three feet across the top, and +the flap or covering was raised about two feet. They were nodding and +swaying in the wind on their short stems. + +"He's headed right for one of them!" Mr. Henderson exclaimed. "I hope +he'll not fall into one of the openings." + +"Is there any danger?" asked Mark. + +"I'm afraid there is," the inventor added. "Those plants are a variety +of the well-known pitcher plant, or fly-trap, as they are sometimes +called. In tropical countries they grow to a large size, but nothing +like these. They are filled, in the cup, with a sort of sticky, sweet +mixture, and this attracts insects. When one enters the cup the top flap +folds over, and the hapless insect is caught there. The plant actually +devours it, nature providing a sort of vegetable digestive apparatus. +These giant plants are the same, and they seem large enough to take in a +man, to say nothing of Jack!" + +With anxious faces the adventurers turned to watch the fate of their +comrade. Jack was slipping, sliding and rolling down the hill. He could +not seem to stop, though he was making desperate efforts to do so. He +was headed straight for one of the largest of the terrible plants. + +In vain, as he saw what was in front of him, did he try to change the +course of his involuntary voyage. Over and over he rolled, until, at +length, he struck a little grassy hummock, bounced into the air, and +right into the opening of a monster pitcher plant. + +"It has him!" cried Mark. "We must save him! Come on everyone!" + +He raced down the hill, while the others came closely after him. They +reached the plant into which Jack had bounced. The flap, or top piece, +had closed down, tightly over the unfortunate boy. + +"Quick! We must save him or he will be smothered to death or drowned in +the liquid the cup contains!" Mr. Henderson exclaimed. "Attack the plant +with anything you can find!" + +"Let's cut through the side of the flower-cup!" suggested Mark. "That +seems softer than the stem." + +His idea was quickly put into operation. Andy's long hunting knife came +in very handy. While the sides of the long natural cup were tough, the +knife made an impression on them, and, soon, a small door or opening had +been cut in the side of the pitcher plant, large enough to enable a +human body to pass through. + +When the last fibre had been severed by Andy, who was chosen to wield +the knife because of his long practice as a hunter, there was a sudden +commotion within the plant. Then a dark object, dripping water, made a +spring and landed almost at the feet of the professor. + +It was Jack, and a sorry sight he presented. He was covered from head to +foot with some sticky substance, which dripped from all over him. + +With hasty movements he cleared the stuff from his eyes and mouth, and +spluttered: + +"It's a good thing you cut me out when you did. I couldn't have held on +much longer!" + + + + + CHAPTER XIX + + THE BIG PEACH + + +Jack soon recovered from his remarkable experience. The terrible plant +that had nearly eaten him alive was a mass of cut-up vegetable matter +which attracted a swarm of insects. Most of them were ants, but such +large ones the boys had never seen before, and the professor said they +exceeded in size anything he had read about. Some of them were as large +as big rats. They bit off large pieces of the fallen plant and carried +them to holes in the ground which were big enough for Washington to slip +his foot into, and he wore a No. 11 shoe. + +But the adventurers felt there were more important things for them to +look at than ants, so they started away again, the professor telling +them all to be careful and avoid accidents. + +It was while they were strolling through a little glade, which they came +upon unexpectedly, that Washington, who was in the lead called out: + +"Gracious goodness! It must be Thanksgivin'!" + +"Why so?" asked Jack. + +"'Cause here's th' remarkablest extraordinary and expansionist of a +pumpkin that ever I laid eyes on!" the colored man cried. + +They all hurried to where Washington had come to a halt. There, on the +ground in front of him, was a big round object, about the size of a +hogshead. It was yellow in color, and was not unlike the golden +vegetable from which mothers make such delicious pies. + +"I allers was fond of pumpkins," said Washington, placing his hand on +the thing, which was almost as tall as he was, "but I never thought I'd +come across such a one as this." + +The professor and the two boys went closer to the monstrosity. Mr. +Henderson passed his hand over it and then, bending closer, smelled of +it. + +"That's not a pumpkin!" he exclaimed. + +"What is it then?" asked Washington. + +"It's a giant peach," the inventor remarked. "Can't you see the fuzz, +and smell it? Of course it's a peach." + +"Well I'll be horn-swoggled!" cried Washington, leaning against the big +fruit, which easily supported him. + +"Hurrah!" cried Jack, drawing his knife from his pocket and opening the +largest blade. "I always did like peaches. Now I can have all I want," +and he drove the steel into the object, cutting off a big slice which he +began to eat. + +"It may be poisonous!" exclaimed Mark. + +"Too late now," responded Jack, the juice running down from his mouth. +"Taste's good, anyhow." + +They all watched Jack while he devoured his slice of fruit. Washington +acted as if he expected his friend to topple over unconscious, but Jack +showed no bad symptoms. + +"You'd better all have some," the boy said. "It's the best I ever +tasted." + +Encouraged by Jack's example, Mark thought he, too, would have some of +the fruit. He opened his knife and was about to take off some of the +peach when suddenly the thing began to roll forward, almost upon him. + +"Hi! Stop your shoving!" he exclaimed. "Do you want to have the thing +roll over me, Jack?" + +"I'm not shoving!" replied Jack. + +"Some one is!" Mark went on. He dodged around the far side of the +immense fruit and what he saw made him cry out in astonishment. + +Two grasshoppers, each one standing about three feet high, were standing +on their hind legs, and with their fore feet were pushing the peach +along the ground. They had been attracted to the fruit by some juice +which escaped from a bruise on that side, which was the ripest, and, +being fond of sweets had, evidently decided to take their find to some +safe place where they could eat it at their leisure. Or perhaps they +wanted to provide for their families if grasshoppers have them. + +"Did you ever see such monsters?" asked Jack. "They're as big as dogs!" + +At the sound of his voice the two grasshoppers, becoming alarmed, ceased +their endeavors to roll the peach along, and, assuming a crouching +attitude seemed to be waiting. + +"They certainly are remarkable specimens," Mr. Henderson said. "If the +other animals are in proportion, and if there are persons in this new +world, we are likely to have a hard time of it." + +This time the immense insects concluded the strangers were not to their +liking. With a snapping of their big muscular legs and a whirr of their +wings that was like the starting of an automobile, the grasshoppers rose +into the air and sailed away over the heads of the adventurers. Their +flight was more than an eighth of a mile in extent, and they came down +in a patch of the very tall grass. + +"Let's go after them!" exclaimed old Andy. "I was so excited I forgot to +take a shot at them. Come on!" + +"I think we'd better not," counseled the professor. "In the first place +we don't need them. They would be no good for food. Then we don't know +but what they might attack us, and it would be no joke to be bitten by a +grasshopper of that size. Let them alone. We may find other game which +will need your attention, Andy. Better save your ammunition." + +Somewhat against his will, Andy had to submit to the professor's ruling. +The old hunter consoled himself with the reflection that if insects grew +to that size he would have some excellent sport hunting even the birds +of the inner world. + +"I wonder what sort of a tree that peach grew on," Jack remarked, as he +cut off another slice, when the excitement caused by the discovery of +the grasshoppers had subsided. "It must be taller than a church steeple. +I wonder how the fruit got here, for there are no trees around." + +"I fancy those insects rolled it along for a good distance," Mr. +Henderson put in. "You can see the marks on the ground, where they +pushed it. They are wonderful creatures." + +"Are we going any farther?" asked Mark. "Perhaps we can find the peach +tree, and, likely there are other fruit trees near it." + +At the professor's suggestion they strolled along for some distance. +They were now about three miles from the airship, and found that what +they had supposed was a rather level plain, was becoming a succession of +hills and hollows. It was while descending into a rather deep valley +that Jack pointed ahead and exclaimed: + +"I guess there's our peach orchard, but I never saw one like it before." + +Nor had any of the others. Instead of trees the peaches were attached to +vines growing along the ground. They covered a large part of the valley, +and the peaches, some bigger than the one they first discovered, some +small and green, rose up amid the vines, just as pumpkins do in a corn +field. + +"Stranger and stranger," the professor murmured. "Peaches grow on vines. +I suppose potatoes will grow on trees. Everything seems to be reversed +here." + +They made their way down toward the peach "orchard" as Jack called it, +though "patch" would have been a better name. Besides peaches they found +plums, apples, and pears growing in the same way, and all of a size +proportionate to the first-named fruit. + +"Well, one thing is evident," Mr. Henderson remarked, "we shall not +starve here. There is plenty to eat, even, if we have to turn +vegetarians." + +"I wonder what time it is getting to be," Jack remarked. "My watch says +twelve o'clock but whether it's noon or midnight I can't tell, with this +colored light coming and going. I wonder if it ever sets as the sun +does." + +"That is something we'll have to get used to," the professor said. "But +I think we had better go back to the ship now. We have many things to do +to get it in order again. Besides, I am a little afraid to leave it +unguarded so long. No telling but what some strange beast--or persons, +for that matter--might injure it." + +"I'm going to take back some slices of peaches with me, anyhow," Mark +said, and he and Jack cut off enough to make several meals, while Bill, +Tom and Washington took along all they could carry. + +As they walked back toward the ship the strange lights seemed to be +dying out. At first they hardly noticed this, but as they continued on +it became quite gloomy, and an odd sort of gloom it was too, first +green, then yellow, then red and then blue. + +"I believe whatever serves as a sun down here is setting," the professor +observed. "We must hurry. I don't want to be caught out here after +dark." + +They hurried on, the lights dying out more and more, until, as they came +in sight of their ship, it was so black they could hardly see. + +Mark who was in the rear turned around, glancing behind him. As he did +so he caught sight of a gigantic shadow moving along on top of the +nearest hill. The shadow was not unlike that of a man in shape, but of +such gigantic stature that Mark knew it could be like no human being he +had ever seen. At the same time it bore a curious resemblance to the +weird shadow he had seen slip into the _Mermaid_ that night before they +sailed. + +"I wonder if it can be the same--the same thing--grown larger, just as +the peach grows larger than those in our world," Mark thought, while a +shiver of fear seemed to go over him. "I wonder if that--that thing +could have been on the ship----" + +Then the last rays of light died away and there was total darkness. + + + + + CHAPTER XX + + OVERHAULING THE SHIP + + +"Keep together!" shouted the professor. "It will not do to become lost +now. We are close to the ship, and will soon be there. Come after me." + +It was more by following the sound of the scientist's voice, than by any +sight which the others could get of him, that they managed to trail +along behind. They reached the ship in safety, however, and entered. +There was no sound as of beasts or insects within, and, though Mark felt +a little apprehensive on account of what he had seen, he and the others +as well, were glad to be again in something that seemed like home. + +"I wish we had some candles, or some sort of a light to see by," the +professor remarked. "We can do nothing in the dark, and there is no +telling how long this night is going to last once it has set in. If I +could have a little illumination, I might be able to fix the dynamo, and +then we could turn on the incandescents. That portable light we had is +broken." + +"By cracky!" exclaimed Andy. "I believe I have the very thing!" + +"You don't mean to say you have a torch or a candle with you, do you?" +asked Mr. Henderson. + +"No, but I have my patent pipe lighting apparatus," the hunter said. "I +always carry it. It gives a little light, but not much, though it may be +enough to work by." + +Not until after several hours work, handicapped as they were by lack of +light, were the repairs to the ship completed. + +"Now we'll start the engine and see how we will come out," the inventor +exclaimed, as he wiped his hands on some waste. + +It did not take long to generate enough power to turn the dynamo. Soon +the familiar hum and whirr was heard, and, a few seconds later the +filaments in the lamps began to glow a dull red, which gradually +brightened until they were shining in all their usual brilliancy. + +"Hurrah!" cried the boys. "Now we can see!" + +They all felt in better spirits with the restoration of the lights, and, +washing off the grease and dirt of their labors in the engine room, they +prepared to sit down to the meal which Washington prepared. + +As soon as the dynamo was working well, care had to be taken not to +speed it too much on account of a mended belt. The professor turned off +part of the lights and switched some of the current into the storage +batteries, to provide for emergencies. For there was no telling how long +the night might last. + +Jack was the first one to finish the meal--they did not know whether to +call it dinner, supper or breakfast. He went into the conning tower, +and, as soon as he reached it he called out: + +"Come on up here, professor! There's something strange going on!" + +Mr. Henderson, followed by Mark, hurried to the tower. As he reached it +and looked out of the forward window, a beautiful white glow illuminated +the whole scene, and then, from below the horizon, there arose seven +luminous disks. One was in the centre, while about it circled the other +six, like some immense pin-wheel. + +"It's the moon!" cried Mark. + +"It's seven moons!" Jack exclaimed. "Why it's almost as light as day!" + +And so it was, for the seven moons, if that is what they were, gave an +illumination not unlike the sun in brilliancy though it was like the +beams from the pale moon of the earth. + +"I guess we need not have worried about the darkness," the professor +remarked. "Still it is a good thing I fixed the dynamo." + +For some time he and the other adventurers watched the odd sight of the +moons, as they rose higher and higher overhead. The scene was a +beautiful, if weird one, for the whole plain was bathed in the soft +light. + +"I guess we can turn off the incandescents, and use all the power for +the storage batteries," Mr. Henderson went on, as he descended into the +ship, and opened the port shutters which had been closed when they +started off on their exploring tour. The interior of the _Mermaid_ was +almost as light as when the odd colored beams had been playing over the +new earth to which they had come. + +"I think we had better continue with our work of making repairs," Mr. +Henderson said. "We can't count on these moons remaining here any length +of time, and I want to take advantage of them. So though some of us +perhaps need sleep, we will forego it and fix up the _Mermaid_. I want +to take a trip and see what other wonders await us." + +They all agreed that they would rather work than sleep, and soon the +entire force was busy in the engine room. There was much to be done, and +the most important things were attended to first. The motive power was +overhauled and found to be in need of several new parts. These were put +in and then the gas generator, and the negative gravity machine, were +put in shape. + +It would have taken something very substantial to have awakened any one +on board the _Mermaid_ that night. They all slept soundly and awoke to +find the strange colored lights shining in through the glass covered +port holes. + +"Well, the sun, or what corresponds to it, is up," observed Jack, "and I +guess we had better do as the little boy in the school reader did, and +get up, too, Mark." + +Soon all the travelers were aroused, and the sound of Washington +bustling about in the kitchen, whence came the smell of coffee, bacon +and eggs, told the hungry ones that breakfast was under way. + +After the meal work was again started on repairing the ship, and by noon +the professor remarked: + +"I think we shall try a little flight after dinner. That is, if one +thing doesn't prevent us." + +"What is that?" asked Jack. + +"We may be held down, as were those stones," was the grave answer. + + + + + CHAPTER XXI + + THE FISH THAT WALKED + + +It was with no little apprehension that the professor prepared to take +his first flight aboard the ship in the realms of the new world. He knew +little or nothing of the conditions he might meet with, the density of +the atmosphere, or how the _Mermaid_ would behave under another +environment than that to which she was accustomed. + +Yet he felt it was necessary to make a start. They would have to attempt +a flight sooner or later, and Mr. Henderson was not the one to delay +matters. So, the last adjustment having been made to the repaired +machinery, they all took their places in the ship. + +The boys and the professor went to the conning tower to direct matters, +while Washington and the others were in the engine room to see that the +machinery worked properly. Mark gave a last look outside as he closed +the big steel cover over the hole through which admission was had to the +craft. He thought he might catch a glimpse of the queer shadow, but +nothing was in sight. It was like a beautiful summer's day, save for the +strange lights, shifting and changing. But the travelers had become +somewhat used to them by this time. + +The professor turned the valve that allowed the gas to enter the holder. +There was a hissing sound and a sort of trembling throughout the entire +ship. The dynamos were whizzing away and the negative gravity machine +was all ready to start. + +For several minutes the travelers waited until the big lifting tank was +filled with the strong vapor. They watched the gages which indicated the +pressure to be several hundred pounds. + +"I think we can chance it now," remarked Mr. Henderson, as he threw over +several levers. "We'll try, at any rate." + +With a tremor the _Mermaid_ left the surface of the inner earth and went +sailing upward toward the--well it wasn't exactly the sky, but it was +what corresponded to it in the new world, though there were no clouds +and no blue depths such as the boys were used to. At all events the +_Mermaid_ was flying again, and, as the adventurers felt themselves +being lifted up they gave a spontaneous cheer at the success which had +crowned their efforts. + +The ship went up several hundred feet, and then, the professor, having +brought her to a stop, sent her ahead at a slow pace. He wanted to be +sure all the apparatus was in good working order before he tried any +speed. + +The _Mermaid_ responded readily. Straight as an arrow through the air +she flew. + +"Well, this is almost as good as being on the regular earth!" exclaimed +Jack. + +"It's better," put in Mark. "We haven't seen half the wonders yet. Let's +open the floor shutter, and see how it looks down below." + +He and Jack went to the room where there was an opening in the floor of +the ship, covered by heavy glass. They slid back the steel shutter and +there, down below them, was the strange new world they had come to, +stretched out like some big map. + +They could see mountains, forests, plains, and rivers, the water +sparkling in the colored light. Over green fields they flew, then across +some stretches where only sand and rocks were to be seen. Faster and +faster the ship went, as the professor found the machinery was once more +in perfect order. Jack was idly watching the play of tinted lights over +the surface of the ground. + +"I wonder what makes it," he said. + +"I have tried to account for it in several ways," said the professor, +who had called Washington to the conning tower and come to join the +boys. "I have had first one theory and then another, but the one I am +almost sure is correct is that hidden volcanic fires cause the +illumination. + +"I think they flare up and die away, and have become so regular that +they produce the same effect as night and day with us. Probably the +fires go out for lack of fuel, and when it is supplied they start up +again. Perhaps it is a sort of gas that they burn." + +"Well, it's queer enough, whatever it is," Jack remarked. "What strikes +me as funny, though, is that we haven't seen a single person since we +came here. Surely this place must be inhabited." + +Mark thought of the strange shadow he had seen, but said nothing. + +"I believe it is," the professor answered. "We will probably come upon +the inhabitants soon. I only hope they are a people who will do us no +harm." + +"If they tried any of their tricks we could mount up in our ship and +escape them," said Andy. + +"Provided they gave us the chance," Mr. Henderson put in. "Well, we'll +not worry about that now." + +For several hours the ship traveled on, until it had come to a different +sort of country. It was wilder and not so level, and there were a number +of streams and small lakes to be seen. + +"Are you going to sail all night?" asked Jack. + +"No," replied the professor. "I think we'll descend very soon now, and +camp out for a while. That lake just ahead seems to offer a good place," +and he pointed to a large sheet of water that sparkled in the distance, +for by this time they had all gone back to the conning tower. + +The lake was in the midst of a wood that extended for some distance on +all sides, and was down in a sort of valley. The ship headed toward it, +and in a short time a landing was made close to shore. + +"Maybe we can have some fresh fish for supper," exclaimed Jack as he ran +from the ship as soon as the sliding door in the side was opened. "Looks +as if that lake had some in it. It is not thick water like in that +stream we stopped at," he added. + +"I believe you're right," old Andy put in, as he turned back to look for +some lines and hooks among his traps. He soon found what he wanted, and +gave them to the boys, taking his trusty gun along for himself. + +While the professor, Washington, Tom and Bill remained behind to make +some adjustments to the machinery, and to get things in shape for the +night, which, they calculated would soon be upon them, Jack, Mark and +Andy went down to the shore of the lake. The boys cut some poles from +the trees, and baiting the hooks with some fat worms found under the +bark, threw in. + +"Let's see who'll get the first bite," spoke Jack. "I'm pretty generally +lucky at fishing." + +"Well, while you're waiting to decide that there contest, I think I'll +take a stroll along shore and see if I can see anything to shoot," Andy +remarked. + +For several minutes the boys sat in silence on the bank of the lake, +watching the play of the vari-colored lights on the water. Suddenly Jack +felt a quiver on his line, and his pole began to shake. + +"I've got something!" he cried. Then his pole bent almost double and he +began to pull for all he was worth. "It's a whopper!" he cried. "Come +and help me, Mark!" + +Mark ran to his friend's aid. Whatever was on the other end of the line +was strong enough to tax the muscles of both boys. They could hear the +pole beginning to break. But for the excellent quality of Andy's line +that would have parted some time before. + +All at once there came a sudden slacking of the pull from whatever was +in the water. And so quickly did it cease that both boys went over +backward in a heap. + +"He's got away!" cried Jack, getting up and brushing some of the dirt +from his clothes. + +"There's something that didn't get away!" cried Mark, who had risen to +his knees, and was pointing at the lake. Jack looked and what he saw +made him almost believe he was dreaming. + +For, emerging from the water, dragging the pole and line the boys had +dropped along with it, was a most curious creature. It was a big fish, +but a fish with four short legs on which it was walking, or rather +waddling along as much as a duck, with a double supply of feet, might +do. + +"Say, do I see that or is there something the matter with my eyes?" sung +out Jack, making ready to run away. + +"It's there all right!" exclaimed Mark. "Hi! Andy! Here's something to +shoot!" he yelled, for indeed the creature was big enough to warrant +attack with a gun. It was about five feet long and two feet through. + +On and on it came, straight at the boys, as if to have revenge for the +pain the fish hook must have caused it, for the barb could be seen +dangling from its lip. On and on it came, waddling forward, the water +dripping from it at every step. It had the body and general shape of a +fish, save that the tail was rather large in proportion. As it came +nearer the boys noted that the feet were webbed, like those of a water +fowl. + +"Come on!" cried Jack. "It may attack us!" + +At that moment the creature opened its mouth, showing a triple row of +formidable teeth, and gave utterance to a sort of groan and grunt +combined. + +This was enough to send Jack and Mark off on a run up the bank, and did +they stop until they heard Andy's voice hailing them. + +"What's the matter, boys?" + +"Come here! Quick!" answered Jack. + +The fish-animal had halted and seemed to be taking an observation. To do +this, as it could not turn its neck, it had to shift its whole body. Old +Andy came up on the run, his gun held in readiness. + +"Where is it?" he asked, and the boys pointed silently. + +The hunter could not repress a start of astonishment as he saw the +strange creature. But he did not hesitate a second. There was a crack of +the rifle, and the thing, whatever it was, toppled over, dead. + +Andy hurried up to it, to get a closer view. + +"Well, this is the limit!" he exclaimed. "First we have grasshoppers +that can roll peaches as big as hogsheads, and now we come across fish +that walk. I wonder what we will see next." + +"I don't want to go fishing in this lake any more," spoke Jack, as he +looked at the repulsive creature. "I never want to eat fish any more." + +"Same here," agreed Mark, and old Andy was of the opinion that the thing +killed would not make a wholesome dish for the table. + +"There don't seem to be any game in this section," he remarked. "Not a +sign could I see, nor have I since we have been here, unless you count +those grasshoppers. But the fruit is good, I'll say that." + +"Come on, we'd better be getting back," Mark said, as he noticed it was +getting dark. "I'm hungry." + + + + + CHAPTER XXII + + THE SNAKE-TREE + + +They managed to make a good meal of the food supplies they had brought +along, and as a dessert Washington made some peach short-cake from the +slices of the giant fruit they had found the day before. Just as they +finished supper it got very dark, but, in about an hour, the moonbeams, +as the travelers called them, came up, and illuminated the lake with a +weird light. + +As the machinery of the _Mermaid_ was now in working order there was no +further alarm because of the darkness. The ship rested on a level keel +about a hundred yards back from the lake, and, seeing that all was snug, +and the fastenings secure, the travelers went to bed. + +Though they had to forego fish for breakfast the travelers made a good +meal. After seeing that the ship was in readiness for a quick start, the +professor suggested they take a walk around and see what sort of country +they might be in now. + +They tramped on for several miles, meeting with no adventures, and +seeing nothing out of the ordinary. It was a pleasant day, just warm +enough to be comfortable, and a little wind was blowing through the +trees. + +"It would be almost like home if it wasn't for the strange lights, and +the memory of the queer things here," said Jack. "I feel fine. Let's see +if you can hit that dead tree over there, Mark." + +Jack stooped to grab up a stone, but no sooner had his fingers touched +it than he called out: + +"There! I forgot all about the stones here being heavier than lead. +Guess we can't throw any of 'em. But come on. I'll race you to the dead +tree!" + +Mark was willing, so the two boys set off at a fast pace. + +"Look out where you're going!" the professor called after them. "No +telling what may be in those woods," for the boys were approaching a +little glade, on the edge of which the dead tree stood. + +Jack reached the goal first, and stood leaning against the trunk, +waiting for Mark. + +"You'd better practice sprinting!" exclaimed the victor. + +Mark was about to excuse himself for his poor showing, on the plea of +having eaten too much breakfast, when to his horror he saw what seemed +to be a long thin snake spring out from the branches of a near-by tree +and twine itself about Jack. + +"Help me! Save me!" cried the unfortunate boy, as he was lifted high +into the air and pulled within the shadow of the wood. + +For an instant Mark was too horror-stricken to move. Then with a shout +that alarmed the others, who were coming along more slowly, he made a +dash for the place he had last seen Jack. + +Had old Andy not been on the watch, with those keen eyes of his, there +might have been a double tragedy. He had seen from afar the sudden +snatching up of Jack, and noted Mark's rush to save his chum. + +"Stand still! Don't go in there for your life!" yelled the hunter, at +the same time running forward with gun ready. + +His example was followed by the professor, Washington and the other two +men. + +"A snake has Jack!" called Mark, when Andy was at his side. + +"No! It's not a snake!" replied the hunter. "It's worse. It's the +snake-tree!" + +"What's that?" asked Mr. Henderson, hurrying up. + +"The snake-tree has Jack," the hunter went on. "It is a plant, half +animal, half-vegetable. It has long branches, not unlike a snake in +shape. They can move about and grab things." + +"One of them got a grip on Jack as he leaned against the dead tree +trunk. I just caught a glimpse of it, and called to prevent Mark from +running into danger." + +"Can't we save him?" asked Mr. Henderson. + +"I'm going to try!" replied Andy. "Quick! Gather up some pieces of dry +wood. I have some paper, and my pipe lighter. We must fight the +snake-tree with fire!" + + + + + CHAPTER XXIII + + THE DESERTED VILLAGE + + +Jack's cries were growing fainter and fainter. Peering in through the +branches of the dead tree the professor could see the whip-like limbs +winding closer and closer about the boy. + +"I am afraid we will be too late!" he said. + +Andy had twisted some paper into a rude torch. He set fire to it with +his pocket lighter, and, when Bill and Mark brought him some little +pieces of dead wood the old hunter added them to his bundle, which was +now blazing brightly. + +"How are you going to do it?" asked the professor. + +"I'll show you," replied Andy. He bound the sticks and paper together +with wisps of grass and then, when it was so hot he could hardly hold it +longer, he ran as close as he dared to the snake-tree and tossed the +torch at the foot of it. + +The blazing bundle fell among some damp leaves and grass, as Andy had +intended it should, and soon a dense smoke arose, pouring straight up +through the branches of the animal-tree, the limbs of which were +gathered in a knot about the half-unconscious form of the boy. + +For a few minutes they all waited anxiously. Would Andy's trick succeed? +Had the terrible tree not already squeezed the life from Jack? + +But, while they watched, there seemed to come a change over the tree. +The snake-like arms waved less and less. They seemed to straighten out, +as though deprived of power by the smoke which was now so dense as to +hide Jack from sight. Then the arms suddenly relaxed and something +rolled from them and fell to the ground. With a quick movement Andy +darted in, crawling on his hands and knees beneath the limbs, and +brought Jack out. The boy was white and his eyes were closed. + +"Get some water!" cried the old hunter. + +Mark ran toward a stream a little distance away. He brought some of the +curiously thick liquid in his hat, and while Andy held the boy the +professor sprinkled some of the drops on his face, and forced some +between his lips. In a little while Jack's eyes slowly opened. + +"Don't let it eat me!" he begged. + +"You're all right now," said Andy heartily. "Not a bit harmed, Jack. +But," he added in a low tone, "it was a close call." + +A few whiffs from a bottle of ammonia the professor carried soon brought +Jack's color back. + +"Do you feel better now?" asked Mark. + +"I guess so. Yes, I'm all right," replied Jack, struggling to his feet. +"What happened? Feels as if I had been tied up with a lot of rope." + +"That's about what you were," Andy replied, "only it was the worst kind +of rope I ever saw. Those snake-trees are terrible things. I've read of +'em, but I never saw one before. The book that told of them says they +squeeze their victims to death just as a snake does. The only way to do +is to make some smoke and fire at the bottom. This sort of kills the +branches or makes them stupid and they let go. The trees are half +animal, and awful things. I hope we don't meet with any more." + +"Same here," added Jack fervently, as he grasped Andy's hand, and +thanked him for saving his life. + +"Do you think you can go on, or shall we return to the ship?" the +professor asked. + +"Oh I can trail along, if you move a little slowly," Jack replied. "I'm +a bit stiff, that's all." + +So they resumed their journey. They had gone, perhaps, three miles when +Washington, who was in the lead, suddenly stopped and called: + +"Sounds like thunder." + +The others listened. Sure enough there was a dull rumble and roar +audible. It seemed off to the left, but they could see no clouds in the +sky, nor any signs of a storm. + +"Let's take a walk over that way and see what it is," Mr. Henderson +suggested. + +As they walked on the noise became louder, until in about half an hour +it was like the sound from a blast furnace. + +"What do you suppose it can be?" asked Mark. + +"Perhaps some new freak of nature," the professor replied. "We seem to +have a good many of them here." + +They were all on their guard now, for there was no telling into what +danger they might run. As they went up a little hill the noise became +much louder. The professor and Andy, who had taken the lead, kept a +sharp lookout ahead, that they might not unexpectedly fall into some +hidden stream or lake. As they topped the hill they saw before them a +deep valley, and in the midst of it was that which was causing the +roaring sound. + +From the centre of an immense mound of rock and earth there spouted up a +great column of water, three hundred feet or more, as straight as a flag +staff. It was about ten feet in diameter, and at the top it broke into a +rosette of sparkling liquid, which as the vari-colored lights played on +it, resembled some wonderful flower. + +"It's a great geyser!" the professor exclaimed. "We have come to a place +like Yellowstone Park. We must be very careful. The crust may be very +thin here, and let us down into some boiling spring." + +The others gathered around the professor, and, from a safe distance +watched the ever rising and falling shaft of water. + +It was not regular in motion. Sometimes it would shoot up to a great +distance, nearly a thousand feet, the professor estimated. Again it +would sink down, as the power sending it out lessened, until it was only +a few hundred feet above the rounded top of the mound from which it +spurted. But it never fell below this. All the while there was the +constant roaring sound, as though the forces of nature below the surface +were calling to be let out. + +"I hope there are not many of those about," Mr. Henderson remarked after +a pause. "If the ship should hit one during the night it would be all up +with us. We must keep a careful lookout." + +The spouting column had a fascination which held them to the spot for +some time. From the hill they had a good view of the surrounding +country, but did not see any more geysers. + +"Do you think it is hot water?" asked Mark. + +"There is no vapor," the professor answered, "but most of the geysers +are produced by the action of steam in the interior of the earth. +However we'll not take any chances by investigating. I fear it would not +be safe to go into that valley." + +"Look there!" cried Andy. "I guess we're better off here!" He pointed a +little to the right of where the water spouted. The others looked, and +saw, coming from a hole in the ground, some shaggy black object. + +"What is it?" asked Jack. + +"It looks like a bear," replied the hunter, "but I never saw one like it +before." + +Nor had any of the others, for the creature was a terrible one. It had +the body of a bear, but the feet and legs were those of an alligator, +while the tail trailed out behind like a snake, and the head had a long +snout, not unlike the trunk of an elephant. The creature was about ten +feet long and five feet in height. + +"Let me try a shot at it!" exclaimed Andy. "That is something worth +shooting," and he cocked his rifle. + +"Don't!" exclaimed the professor shortly. "You might only wound it, and +it would pursue us. We are not ready to fight such creatures as that, +and you are the only one armed." + +"I never missed anything I aimed at yet," said Andy, a little hurt that +any one should doubt his ability to kill at the first shot. + +"Perhaps not, but how do you know but what this creature has a bullet +proof armor under its hide. This is a strange world, Andy. It is better +to take no chances." + +"I hate to see him get away," the hunter said. + +But, as it happened, the beast was not to get away. As they watched they +saw the horrible animal approach the mound from which the water spurted. +Up the sides it climbed. + +"I guess he's going to get a drink," said Mark. + +That was evidently the beast's intention. It went close to the spouting +column of water, and thrust its head out so that its tongue could lap +from the side. It seemed to have been in the habit of doing this. + +For once, and for the last time, however, it made a mistake. The water +seemed to veer to one side. In its eagerness to get a drink the animal +took another step forward. At that moment the direction of the column +changed again, and it tilted over toward the beast. + +Suddenly, as the travelers watched, the full force of the big column +caught the beast just under the fore shoulders. Up into the air the +creature shot, propelled by thousands of pounds pressure. Right up to +the top of the column it went, and this time the water rose a thousand +feet into the air. + +Up and up went the animal, struggling to get away from the remorseless +grip. Then, when the water had reached its height, it shot the beast off +to one side. Then the brute began to fall, twisting, turning, wiggling +and struggling. Down it came with a thud that could be heard above the +noise of the geyser. + +"I reckon that finishes him," observed Andy. And it had, for there was +not a sign of life from the creature. + +"I guess we have seen enough for one morning," the professor said. +"Let's go back to the airship. It must be nearly dinner time." + +They started away. Mark gave a last look at the queer column of water +and the dead body of the strange animal. As he passed down the hill he +thought he saw the creature move, and stayed to see if this was so. But +a second glance convinced him he was mistaken. + +The others had gone on and were some distance ahead. Mark hurried on to +join them. As he got a last glance at the top of the column, over the +brow of the hill, he happened to look off to the left. There was another +hill, about the size of the one they had been on. + +[Illustration: UP IN THE AIR THE CREATURE SHOT] + +And, as Mark looked he saw something move. At first he thought it was +another beast. But, to his terror he saw that the creature had only two +legs, and that it stood upright like a man, but such a man as Mark had +never seen before, for he was nearly twelve feet tall. + +He was about to cry out and warn the others, when the thing, whatever it +was, sunk down, apparently behind some tall bushes, and disappeared as +if the earth had opened and swallowed it. + +"I wonder if I had better tell them," thought Mark. "I can't show them +anything. I wonder if I really saw it, or if it was only a shadow. I +guess I'll say nothing. But it is very strange." + +Then he hurried on to join the others. + +"What makes you so pale?" asked Jack of his chum. + +"Nothing," said Mark, somewhat confused. "I guess I'm a little tired, +that's all." + +They reached the ship in safety, and, having dinner started the +machinery and took the _Mermaid_ up into the air. + +"We'll travel on and see if we can't find some human beings," the +professor said. + +All that afternoon they sailed, the country below them unfolding like a +panorama. They passed over big lakes, sailing on the surface of some, +and over rivers, and vast stretches of forest and dreary plains. But +they never saw a sign of human inhabitants. + +It was getting on to five o'clock, the hour when the brilliant lights +usually disappeared, when Mark, who was steering in the conning tower, +gave a cry. + +"What is it?" asked the professor, looking up from a rude map he was +making of the land they had just traversed. + +"It looks like a town before us," said the boy. + +Mr. Henderson and Jack looked to where Mark pointed. A few miles ahead +and below them were great mounds, not unlike that from which the geyser +had spouted. But they were arranged in regular form, like houses on a +street, row after row of them. And, as they approached nearer, they +could see that the mounds had doors and windows to them. Some of the +mounds were larger than others, and some were of double and triple +formation. + +"It's a city! The first city of the new world!" cried Jack. + +"It is a deserted village!" said the professor. "We have found where the +people live, but we have not found them." And he was right, for there +was not a sign of life about the place, over which the airship was now +suspended. + + + + + CHAPTER XXIV + + THE GIANTS + + +"Let's go down and investigate," suggested Jack. + +"Better wait," counseled the professor. "It will soon be dark, and, +though we will have moonlight, we can not see to advantage. I think it +will be best to keep the ship in the air to-night, and descend in the +morning. Then we can look about and decide on what to do." + +They all agreed this was the best plan, and, after making a circle above +the deserted village, and noting no signs of life, the _Mermaid_ was +brought to a halt over the centre of the town, and about three hundred +feet above it. There the travelers would be comparatively safe. + +It was deemed best to keep watch that night, and so, Mark, Jack, Bill +and Tom took turns, though there was nothing for them to do, as not a +thing happened. With the first appearance of dawn Mr. Henderson gave +orders to have the ship lowered, and it came to rest in the middle of +what corresponded to a street in the queer mound village. + +"Now to see what kind of people have lived here!" cried Jack. "They must +have been a queer lot. Something like the Esquimaux, only they probably +had more trouble keeping cool than the chaps up at the north pole do." + +Now that they were down among the mound houses, they saw that the +dwellings were much larger than they had supposed. They towered high +above the boys' heads, and some of them were large enough in area to +have accommodated a company of soldiers. + +"Say, the chaps who lived in these must have been some pumpkins," said +Jack. "Why the ceilings are about fifteen feet high, and the doors +almost the same! Talk about giants! I guess we've struck where they used +to hang out, at any rate." + +The houses were a curious mixture of clay and soft stone. There were +doors, with big skins from animals as curtains, and the windows were +devoid of glass. Instead of stairs there were rude ladders, and the +furniture in the mound houses was of the roughest kind. + +There were fire-places in some of the houses, and the blackened and +smoked walls showed that they must have been used. In one or two of the +houses clay dishes, most of them broken, were scattered about, and the +size of them, in keeping with everything else, indicated that those who +used them were of no small stature. + +"Some of the bowls would do for bath tubs," said Jack, as he came across +one or two large ones. + +By this time the professor, Bill and Tom had joined the boys, and the +five went on with the exploring tour, while Washington and Andy remained +in the ship to get breakfast. + +"The inhabitants are evidently of a half-civilized race," the professor +said. "Their houses, and the manner in which they live, show them to be +allied to the Aztecs, though of course they are much larger than that +race." + +"What's bothering me," Bill said, "is not so much what race they belong +to, as what chance we'd stand in a race with them if they took it into +their heads to chase after us. I've read that them there Azhandled +races----" + +"You mean the Aztecs," interrupted the professor. + +"Well the Aztecs, then. But I've read they used to place their enemies +on a stone altar and cut their hearts out. Now I'm not hankerin' after +anything like that." + +"Don't be foolish," spoke Mr. Henderson. "Wait until you meet some of +the giants, if that is what they are, and then you can decide what to +do." + +"It may be too late then," remarked Bill in a low tone, and the boys +were somewhat inclined to agree with him. + +However, there seemed to be no immediate danger, as there was no sign of +any of the big people about the village. The adventurers walked about +for some time, but made no discoveries that would throw any light on the +reason for the place being left uninhabited. It seemed as if there had +been a sudden departure from the place, for in a number of the houses +the remains of half-cooked meals were seen. + +"Well, I think we have noted enough for the time being," the professor +remarked, after they had traversed almost half the length of what seemed +to be the principal street. "Let's go back to the ship and have +something to eat. Washington may have become alarmed at our absence." + +They made a circle in order to take in another part of the town on their +way back. While passing through a sort of alley, though it was only +narrow by comparison with the other thoroughfares that were very wide, +Mark came to a place where there was a circular slab of stone, resting +on the ground. In the centre was a big iron ring. + +"Hello! Here's something new!" he exclaimed. "Maybe it leads to a secret +passage, or covers some hidden treasure." + +"I guess it will have to continue to cover it then," Jack spoke. "That +probably weighs several tons. None of us could move it." + +They made their way back to the ship, where they found Washington and +Andy discussing the advisability of going off in search of them. + +"Breakfast is mighty near spoiled," said the colored man with an injured +air. + +But the travelers did full justice to the meal, notwithstanding this. +Deciding there was nothing to be gained by staying in that vicinity, the +professor started the ship off again. + +They traveled several hundred miles in the air, and, as the afternoon +was coming to a close, Jack, who was in charge of the conning tower, +spied, just ahead of them, another village. + +"We will descend there for the night," the professor said. "Does there +seem to be any sign of life about?" + +"None," replied Mark, who was observing through a telescope the town +they were approaching. "It's as dead as the other one." + +The airship settled down in a field back of some of the mound houses. + +"Now for supper!" cried Jack. "I'm as hungry as----" + +He stopped short, for, seeming to rise from the very ground, all about +the ship, there appeared a throng of men. And such men as they were! For +not one was less than ten feet tall, and some were nearly fifteen! + +"The giants have us!" cried Bill, as he saw the horde of creatures +surrounding the ship. + + + + + CHAPTER XXV + + HELD BY THE ENEMY + + +"Keep the doors closed!" cried the professor. "It is our only hope! I +will send the ship up again!" + +But it was too late. Washington, who had obeyed the signal from the +conning tower to shut off the engines, had disconnected most of them so +they could not be started again save from the main room. At the same +time there came a yell of dismay from the colored man, who had slid back +the steel covering of the main side entrance to the _Mermaid_. + +"I'm caught!" cried Washington. + +As the professor and the boys hurried from the tower, they could hear a +struggle from where Washington was, and his voice calling: + +"Let me go! Let me go!" + +Reaching the engine room, which opened directly on the side entrance, +the professor saw a pair of enormous hands and arms dragging poor +Washington, feet first, out of the ship. Bill and Tom were crouched in +one corner, pale with fright. + +"Wait until I get my gun!" cried Andy, as he ran for his rifle. + +"Hold on!" called the professor in a loud voice. "It will be folly to +shoot them! We must try strategy!" + +Washington's cries ceased as he was drawn entirely from the ship, the +giant hands disappearing at the same time. + +"Follow me!" yelled Mr. Henderson, running out of the door. + +Hardly knowing what they did, the boys went after him, and their hearts +almost stopped beating in fright as they saw the terrible things, which, +in the glare of the changing lights, were on every side of them. + +For the men were very repulsive looking. They were attired in clothes, +very similar in cut to those worn by the travelers, and which seemed to +be made of some sort of cloth. But they were loose and baggy and only +added to the queer appearance of the giants. Veritable giants they were +too. Their faces seemed as large as kegs, and they were so clumsy in +shape that Mark, even, frightened as he was, exclaimed: + +"They look like men made of putty!" At the same time he saw they bore a +resemblance to the creature he had observed on the hill top. + +"What shall we do?" asked Andy of the professor. "They are really +carrying Washington away!" + +Three of the giants were dragging the colored man along the ground, +while the other terrible beings stood about as if waiting to see the +outcome of the first sally. + +"I will try to speak to them," Mr. Henderson said. "I know several +languages. They may understand one." + +But before he could start on his parley a surprising thing happened. +There was a struggle in the little group about Washington. The colored +man seemed to be fighting, though the odds, it would appear, were too +great to enable him to accomplish anything. But, making a desperate +effort to escape, Washington quickly wrenched himself free from the +giants' hands and then, striking out with his fists, knocked the three +down, one after another. + +"I never knew Washington was so strong!" exclaimed Jack. + +"Nor I," put in Mark. "Why I should think the men could carry him in one +arm as if he was a baby." + +The three giants rose slowly to their feet. They uttered strange cries, +and motioned with their hands toward the professor, the boys, and the +others in the crowd. + +"Look out! They're goin' t' grab yo'!" cried Washington. + +Three of the giants approached Mark, and a like number closed in on +Jack. + +"Back to the ship!" cried the professor. "We must defend ourselves!" + +But by this time the big men had grabbed the two boys. Then a strange +thing took place. Mark and Jack, though they felt that the giants must +overcome them in a test of strength, struggled with all their might +against being captured. They fought, as a cornered rat will fight, +though it knows the odds to be overwhelming. But in this case the +unexpected happened. + +Both boys found they could easily break the holds of the giants, and +Mark, by a vigorous effort, pushed the three men away from him, one at a +time violently so that they fell in a heap, one on top of the other. + +"Hurrah! We can fight 'em!" cried Mark. "Don't be afraid. They're like +mush! They're putty men!" + +And, so it seemed, the giants were. Though big in size they were flabby +and had nothing like the muscle they should have had in proportion to +their build. They went down like meal sacks and were slow to rise. + +[Illustration: THE BIG MEN HAD GATHERED IN A COMPACT MASS] + +Jack, seeing how successful his comrade was, attacked the three giants +who were striving to make him a captive. He succeeded in disposing of +them, knocking one down so hard that the man was unable to rise until +his companions helped him. + +"That's the way!" cried Washington. "They're soft as snow men!" + +The vanquished giants set up a sort of roar, which was answered by their +fellows, and soon there was a terrible din. + +"All get together!" called the professor. "They are evidently going to +make a rush for us. If we stand by one another we may fight them off, +though they outnumber us a hundred to one. Besides it will soon be dark, +and we may be able to escape!" + +Washington, Jack and Mark retreated toward the ship, in the direction of +which the others had also made their way. The big men had gathered in a +compact mass and were advancing on the adventurers. + +"What do you suppose makes them so soft?" asked Mark. "I believe I could +manage half a dozen." + +"It must be the effect of the climate and conditions here," the +professor replied. "Probably they have to be big to stand the pressure +of the thick water, and the increased attraction of gravitation. Then +too, being without the weight of the atmosphere to which we are +accustomed, they have probably expanded. If they were to go up to earth, +they might shrink to our size." + +"Do you think that possible?" + +"Of course. Why do you ask?" + +"Nothing in particular," replied Mark. But to himself, he added: "That +would explain it all." + +It was getting dusk now. The travelers had reached their ship, and +rushed inside and tried to close the doors in the face of the advancing +horde. But, by this time the giants were so close that one or two of +them thrust their big feet in, and prevented this movement. At the same +time they set up a great howling. + +"Quick!" cried the professor. "We must start the ship and get away!" + +"I can't close the door!" yelled Washington, who had been the last to +enter. + +"Never mind that! _Go_ up with it open! Drag them along if they won't +let go!" answered Mr. Henderson, as he ran toward the engine room. + +There was a sudden rush among the giants, and a sound as if something +was being thrown over the top and ends of the ship. Mark turned the gas +machine on, while Jack worked the negative gravity apparatus. They +waited for the ship to rise. + +"Why don't we go up?" asked the professor. + +"'Cause they've caught us!" called out Washington. + +"Caught us? How?" + +"They've thrown ropes over the top and ends of the ship, and fastened +them to their big houses!" + +Running to a side window the professor saw that the _Mermaid_ was +fastened down by a score of cables, each one six inches thick. They were +held captives by the enemy. + + + + + CHAPTER XXVII + + A FRIEND INDEED + + +Though the giants, man for man, were no match for the travelers, +collectively the horde proved too much. They had swarmed about the ship, +and, by passing the big cables over her, effectively held her down. + +"Let me get out and I'll cut 'em!" cried Andy. "We must get away from +these savages!" + +"No, no, don't go out!" exclaimed the professor. "They would eventually +kill you, though you might fight them off for a time. We must wait and +see what develops. They can have no object in harming us, as we have not +injured them." + +"I'd rather fight 'em," insisted the old hunter. + +But the professor had his way and Andy was forced to obey. The giants +had withdrawn their big feet from the side door and Washington had +closed it. But nothing else had been accomplished, and the ship could +not rise. The gas and negative gravity machines were stopped, as they +were only under a useless strain. + +Suddenly, the colored lights which had been growing dimmer and dimmer, +with the approach of night, went out altogether. Almost as suddenly, +Mark, who was watching the giants from the conning tower, as they made +fast the loose ends of the cables, saw them make a dash for the mound +houses. + +"They're afraid of the dark!" he cried. "Come on! We can go out now and +loosen the ropes!" + +He hurried to tell the professor what he had noticed. + +"Good!" exclaimed Mr. Henderson. "Perhaps we can escape now!" + +They waited a few minutes, listening to the sound of many big feet +running away from the ship, and then, Bill cautiously opened the side +door. The others were behind him, waiting, with knives and hatchets in +their hands, to rush out and cut the restraining cables. + +"All ready!" called Bill. "There doesn't seem to be a one in sight!" + +He stepped out but no sooner had he set foot on the ground than there +came a thud, and Bill went down as if some one had knocked his feet from +under him. + +"Go back! Go back!" he cried. "They hit me with something. I'm being +smothered!" + +"Bring a light!" cried the professor, for the sally had been started in +the dark. + +Jack brought the portable electric it having been repaired and flashed +it out of the door. In the gleam of it, Bill was seen lying prostrate, +half covered by an orange, about half as big as himself. The fruit was +as soft and mushy as some of the giants themselves, or Bill would not +have fared so easily. + +Then, as the others stood watching, and while Bill arose and wiped some +of the juice from his face, there came a regular shower of the monstrous +oranges. + +"Get inside quick! We'll be smothered under them!" Mr. Henderson cried. + +Pausing only to rescue Bill, the adventurers retreated inside the ship, +and made fast the door. Outside they could hear the thud as the oranges +were thrown, some hitting the _Flying Mermaid_ and many dropping all +about her. + +"I guess they are going to have things their own way," observed Bill, as +he gazed down on his clothes, which were covered with juice from the +fruit. + +The night was one of anxiety. The travelers took turns standing guard, +but nothing more occurred. The giants remained in their houses, and the +heavy ropes still held the ship fast. + +"We must hold a council of war," the professor decided as they gathered +at breakfast, which was far from a cheerful meal. + +With the return of the colored lights the giants again made their +appearance. They came swarming from the mound houses, and a great crowd +they proved to be. Several thousand at least, Jack estimated, and when +he went up into the conning tower and took a survey he could see the +strange and terrible creatures pouring in from the surrounding country. + +"I'm afraid there will be trouble," he said, as he came down and +reported what he had seen. + +"We must hold a council of war," repeated the professor. "Has any one +anything to suggest?" + +"Get a lot of powder and blow 'em up!" cried Andy. + +"Arrange electric wires and shock 'em to death!" was Bill's plan. + +"Can't we slip the ropes in some way and escape?" asked Jack. "I don't +believe we can successfully fight the giants. They are too many, even if +they are weak, individually." + +"I think you're right there," Mr. Henderson said. "We must try some sort +of strategy, but what? That is the question." + +For a few minutes no one spoke. They were all thinking deeply, for their +lives might hang in the balance. + +"I think I have a plan," said Mark, at length. "Did we bring any diving +suits with us?" + +"There may be one or two," the professor replied. "But what good will +they do?" + +"Two of us could put them on," continued Mark, "and, as they afford good +protection from any missiles like fruit, we could crawl out on the deck +of the ship. From there, armed with hatchets or knives we could cut the +ropes. Then the ship could rise." + +"That's a good plan!" cried the scientist. "We'll try it at once!" + +Search revealed that two diving suits were among the stores of the +_Mermaid_. Jack and Mark wanted to be the ones to don them, but as the +suits were rather large, and as the professor thought it would take more +strength than the boys had to do the work, it was decided that Andy and +Washington should make the attempt to cut the ropes. + +The hunter and colored man lost little time in getting into the modern +armor. In the meanwhile Jack, who had been posted as a lookout, reported +that there seemed to be some activity among the giants. They were +running here and there, and some seemed to be going off toward the +woods, that were not far away. + +"Now work quickly," urged the professor. "We will be on the watch, and +as soon as the last rope is cut we will start the machinery and send the +ship up. We will not wait for you to come back inside, so hold fast as +best you can when the _Mermaid_ rises." + +"We will," answered Andy, just before the big copper helmet was fastened +on his head, and Washington nodded to show he understood. + +The two who were to attempt the rescue of their comrades were soon on +deck. In the conning tower Jack and the professor kept anxious watch, +while Mark, Bill and Tom were at the various machines, ready, at the +signal, to start the engines. + +The giants had now become so interested in whatever plan they had afoot, +that they paid little attention to the ship. Consequently Washington and +Andy, crawling along the deck in their diving suits, did not, at first +attract any attention. + +In fact they had cut several of the big ropes, and it began to look as +if the plan would succeed, particularly as they were partly hidden from +view by the upper gas holder. They were working with feverish haste, +sawing away at the big cables with keen knives. + +"I guess we'll beat 'em yet!" cried Jack. + +"I hope so," replied the professor. "It looks----" + +He stopped short, for at that moment a cry arose from the midst of the +giants, and one of them pointed toward the ship. An instant later the +air was darkened with a flight of big oranges, which the queer creatures +seemed to favor as missiles. Probably they found stones too heavy. + +"Well, those things can't hurt 'em much with those heavy suits on," +observed Mr. Henderson. "There, Washington got one right on the head +that time, and it didn't bother him a bit." + +Jack had seen the fruit strike the big copper helmet and observed that +the colored man only moved his head slightly in order to get rid of the +orange. + +In fact the giants, seeing for themselves that this mode of warfare was +not going to answer, since the two men on the ship continued to cut the +restraining cables, gave it up. There was a good deal of shouting among +them, and a number ran here and there, seemingly gathering up long +poles. + +"I wonder if they are going to try the flailing method, and beat poor +Andy and Washington," said Mr. Henderson. "It looks so." + +The two rescuers were now about a quarter through their hard task. The +throwing of the oranges had ceased. But the giants were up to a new +trick. They divided into two sections, one taking up a position on one +side of the ship, and the other on the opposite. There were about two +hundred in each crowd, while the others in the horde drew some distance +back. + +"They're up to some queer dodge," observed Jack. "What are they placing +those sticks to their mouths for?" + +The professor observed the throng curiously for a few seconds. Then he +exclaimed: + +"They are using blow-guns! They are going to shoot arrows at Washington +and Andy! We must get them in at once!" + +He darted toward a door that opened from the conning tower out on the +deck. + +"Don't go!" cried Jack. "It's too late! They are beginning to blow!" + +He pointed to the throng of giants. The professor could see their cheeks +puffed out as the big creatures filled their lungs with air and prepared +to expel it through the hollow tubes. + +Then there came a sound as if a great wind was blowing. It howled and +roared over the ship, not unlike a hurricane in its fury. But there was +no flight of arrows through the air, such as would have come from +regular blow guns. + +"That is strange," said the professor. He thought for a moment. "I have +it!" he cried, "They are trying to blow Washington and Andy off the ship +by the power of their breaths! They are not blowing arrows at them! My, +but they, must have strong lungs!" + +And, in truth, that was the plan of the giants. The hollow tubes, made +from some sort of big weed, sent a blast of air at the two men on the +ship's deck, that made them lie flat and cling with both hands to avoid +being sent flying into the midst of the giants, on one side or the +other. But the giants had reckoned without the weight of the diving +suits, and it was those, with the big lead soles of the shoes, that +helped to hold Washington and Andy in place. + +"Come back! Come back!" cried the professor, opening the conning tower +door and calling to the two brave men. "Come back, both of you! Do you +hear?" + +As the portal slid back the rush of air was almost like that of a +cyclone. Then it suddenly ceased, as the giants saw their plan was not +likely to succeed. + +But now there arose from the outer circle of the horde a shout of +triumph. It was caused by the return of those who had, a little while +before, hurried off to the woods. They came back bearing big trees, tall +and slender, stripped of their branches, so that they resembled flag +staffs. It took a dozen giants to carry each one. + +The whole throng was soon busy laying the poles in a row in front of the +ship. + +"What can they be up to now?" asked Jack. + +"It looks as if they were going to slide the ship along on rollers," the +professor replied. + +Sure enough this was the giant's plan. A few minutes later those in the +_Mermaid_ felt her moving forward, as the giants, massed behind, shoved. +On to the poles she slid. The ropes were loosened to permit this, but +not enough to enable the boat to rise. + +Then the travelers felt the ship being lifted up. + +"They are going to carry us away, with the poles for a big stretcher!" +cried the professor. + +Looking from the side windows the boys saw that a great crowd of the big +men were on either side of the _Mermaid_, each giant grasping a pole, +and lifting. Farther out were others, holding the ends of the cables +which Washington and Andy had not succeeded in cutting. + +The ship was being carried along by a thousand or more giants, as the +ancient warriors, slain in battle, were carried home on the spears of +their comrades. + +"This is the end of the _Mermaid_!" murmured Mr. Henderson in sorrowful +tones. + +As they looked from the conning tower the professor and the two boys +observed a commotion among the leaders of the giants. They seemed to be +wavering. Suddenly the forward part of the ship sank, as those ahead +laid their poles down on the ground. Then those behind did the same, and +the _Mermaid_, came to a stop, and once more rested on the earth. + +"What does this mean?" asked the scientist in wonder. + +All at once the entire crowd of giants threw themselves down on their +faces, and there, standing at the bow of the ship, was a giant, half +again as large as any of the others. He was clad in a complete suit of +golden armor on which the changing lights played with beautiful effect, +and in his hand he held an immense golden sword. He pointed the weapon +at the ship as if he had raised it in protection, and his hand was +stretched in commanding gesture over the prostrate giants. + +"Perhaps he has come to save us!" cried Mark. + + + + + CHAPTER XXVII + + A GREAT JOURNEY + + +Such indeed, seemed to be the case. The golden-armored giant, after +standing for a few moments in an attitude of command, waved his sword +three times about his head, and uttered a command, in a voice that +sounded like thunder. Then the prostrate ones arose, and, making low +bows hurried away in all directions. + +Watching them disappear, the golden one sheathed his weapon and +approached the ship. He caught sight of the professor and the two boys +in the conning tower, for Mark had gone there when he found the ship +being transported, and held up his two hands, the palms outward. + +"It is the sign of peace in the language all natives employ," said the +professor. "I think I shall trust him." + +Followed by the boys he descended from the little platform in the tower, +and to the door that opened on the deck. + +"Shall we go out?" he asked. + +"We can't be much worse off," replied Mark. "Let's chance it." + +So, not without many misgivings, they slid back the portal and stepped +out to face the strange and terrible being who had so suddenly come to +their rescue. + +The giant in the golden armor did not seem surprised to see them. In +fact he acted as though he rather expected them. He continued to hold up +one hand, with the palm, outward, while, with the other, he removed his +helmet and bowed low. Then he cast his sword on the ground and advanced +toward the ship. When within ten feet he sat down on the ground, and +this brought his head nearer the earth, so that his auditors could both +see and hear him to better advantage. + +As soon as the giant saw the travelers were outside their ship he began +to speak to them in a voice, which, though he might have meant it to be +low and gentle, was like the bellowing of a bull. At the same time he +made many gestures, pointing to the ship, to himself and to Mark. + +"What is he saying, professor?" asked Jack. + +"I can't understand all he says," Mr. Henderson replied. "He uses some +words derived from the Latin and some from the Greek. But by piecing it +out here and there, and by interpreting his motions I am able to get at +something." + +"And what is it all about?" + +"It is a strange story," the scientist replied. "He has only gone about +half way through it. Wait until he finishes and I will tell you." + +The golden-armored giant, who had stopped in his narrative while Jack +was speaking, resumed. His gestures became more rapid, and his words +came faster. Several times Mr. Henderson held up his hand for him to +cease, while he puzzled out what was meant. + +At one point, the professor seemed much startled, and motioned for the +strange being to repeat the last part of his discourse. When this had +been done Mr. Henderson shook his head as though in doubt. + +At length the story was finished, and the lone giant, for there were no +others in sight now, folded his arms and seemed to await what the +professor's answer might be. Mr. Henderson turned to the boys, and to +the others of the _Mermaid's_ company, who, by this time, had joined +him, and said: + +"Friends, I have just listened to a strange story. It is so strange +that, but for the fact that our own adventures are verging on the +marvelous, I could hardly believe it. In the first place, this man here +is the king of this country. That is why all the other natives obeyed +him. + +"In the second place it seems he has been a passenger in our boat, and +came here from the earth's surface with us!" + +"What's that?" cried Jack. + +"That explains the strange happenings!" ejaculated Mark. "No wonder I +could never solve the secret of the storeroom." + +"You are right, it does," replied Mr. Henderson. "I will not go into all +the details of how it happened, but it seems the big hole through which +we came is only one of two entrances to this inner world. Rather it is +the entrance, and there is another, close to it, which is the exit. +Through the latter a big stream of water spouts up, just as one pours +down through the opening we used. + +"Hankos, which is the name of the king, was for many years a student of +science. He longed to see where the big stream of upward spurting water +went, and wanted to know whence came the down-pouring one. So he +undertook a daring experiment. + +"He constructed a great cylinder, and, keeping his plans a secret, +conveyed it to the spouting water, entered it, and, by means of pulleys +and levers, after he had shut himself inside, cast himself into the +up-shooting column. He took along compressed air cylinders to supply an +atmosphere he could breathe, and some food to eat, for it appears our +giant friends are something of inventors in their way. The current of +water bore him to the surface of the earth, and he was cast up on the +ocean, in what was probably taken for a waterspout if any one saw it. + +"Then a strange thing happened. No sooner did Hankos open his cylinder, +which served him as a boat, than he lost his gigantic size, owing to the +difference of the two atmospheres. He became almost of the same size as +ourselves, except that his skin hung in great folds on him, and he +seemed like a wrinkled old man. His clothes too, were a world too large. + +"He had a terrible time before he reached shore, and a hard one after +it, for his strange appearance turned almost every one against him. He +was sorry he had ventured to solve the mystery of the up-shooting stream +of water, for he was worse than an outcast. + +"Then he began to plan to get back to his own inner world. But he could +not find the downward stream, and, not knowing the language of the +countries where he landed, he had no means of ascertaining. He traveled +from place to place, always seeking for something that would lead him +back to his own country. + +"Finally he heard of us, and of our ship, though how I do not know, as I +thought I had kept it a great secret. By almost superhuman struggles he +made his way to our island. He says he concealed himself aboard the +_Mermaid_ the night before we sailed, but I hardly believe it possible. +It seems----" + +"He did it, for I saw him!" interrupted Mark. + +"You saw him!" cried Mr. Henderson. + +Then Mark told of the many things that had puzzled him so, how he had +seen the queer figure slinking aboard the boat, of the disappearance of +food from time to time, and of the strange noises in the storeroom. + +"That bears out what he told me," the professor said. "Hankos says he +used to steal out nights and take what food he could get, and he also +mentions some one, answering to Mark's description, who nearly +discovered him once as he hurried back into the apartment. + +"However, it seems to be true, since Mark confirms it. At any rate +Hankos stayed in hiding, and made the entire trip with us, and, just as +we all became overcome with the strange gas he escaped, having begun to +expand to his original giant size, and being unable to remain any longer +in his cramped quarters." + +"That's so, he did!" cried Mark. "I saw him come out of the place just +before I lost my senses. It was a terrible sight, and none of you would +believe me when I told you some of the occurrences afterward." + +"You must forgive us for that," the professor said. "We have learned +much since then." + +"What did Hankos do after he left the ship when it landed in this +country?" asked Jack. + +"He traveled until he came to this village, which is the chief one of +this country," replied the professor. "Part of the time he followed us +at a distance, being able to travel very fast." + +Mark remembered the strange figure of a giant he had seen on the hill +tops several times, and knew that he had been observing the being who +had played such a queer part in their lives. + +"When he came back among his own people," went on Mr. Henderson, "they +would not receive him at first, believing him to be an impostor. But +Hankos convinced them of his identity and was allowed to don the golden +armor, which is the badge of kingship. He had only been in office for a +little while when he heard of the arrival of the strange thing, which +turned out to be our ship. He recognized it from the description, and, +learning that we were likely to be sacrificed to the fury and ignorance +of the giants, he hurried here and saved our lives. + +"He says he can never thank us enough for being the means whereby he was +able to get back to his own country, and says the freedom of this whole +inner world is ours. He has given orders that we are to go wherever we +like, and none will molest us. He tells me the land is a wonderful one, +compared to our own, and urges us to make a long journey. He would like +to go with us, only, now that he has resumed his natural size, he can +not get inside the ship." + +"Hurrah for King Hankos!" cried Jack and the others joined him in a +hearty cheer. + +The giant in the golden armor evidently understood the compliment which +was paid him, for he waved his helmet in the air and responded with a +shout of welcome that made the ground tremble. + +Hankos waited until the professor had translated all of the story to the +other travelers. Then the genial giant began to talk some more, and the +professor listened intently. + +"He says," spoke Mr. Henderson to his friends, "that we will be supplied +with all the fruit we want, and with the best of the houses to sleep in +on our journey. He also tells me he has great stores of shining stones +and piles of the metal of which his armor is made, and that we are +welcome to as much as we want. If this means unlimited gold and +diamonds, we may make our fortunes." + +"Jest let me git ma' hand on a few sparklers an' I'll quit work!" +exclaimed Washington. + +"I have told him," the scientist went on, "that we will take advantage +of his kind offer. We will start on our trip in a day or so, after we +have looked over the ship to see if it is not damaged. He tells me the +gold and sparkling stones are several thousand miles away, on top of a +high mountain. We will make that our objective point." + +The interview between the king and Mr. Henderson having ended, the +former waved his sword in the air and the swarm of big men came back. +They had been hiding back in the woods. Now their manner was very +different. They carefully, removed the rollers and ropes, and soon there +was brought to the adventurers an immense pile of fine fruits. If our +friends had stayed there a year they could not have eaten it all. The +giants were judging the appetites of the travelers by their own. + +That night the adventurers slept more soundly than they had since +entering the strange world. They felt they had nothing to fear from the +giants. In the morning they were not molested, though big crowds +gathered to look at the ship. But they kept back a good distance. The +machinery was found to be in good shape, save for a few repairs, and +when these were made, the professor announced he would start on a long +journey. + +For several weeks after that the travelers swung about in their ship, +sometimes sailing in the air and again on big seas and lakes viewing the +wonders of the inner world. They were many and varied, and the professor +collected enough material for a score of books which he said he would +write when he got back to the outer world once more. + +One afternoon, as they were sailing over a vast stretch of woodland, +which did not seem to be inhabited, Mr. Henderson, looking at one of the +gages on the wall, asked: + +"Boys do you know how far you have traveled underground?" + +"How far?" asked Jack, who hated to guess riddles. + +"More than four thousand miles," was the answer. + +"But we haven't come to that mountain of gold and diamonds," said Mark. +"I am anxious to see that." + +"Have patience," replied the professor. "I have not steered toward it +yet. There are other things to see." + +Just then Washington's voice could be heard calling from the conning +tower: + +"We're coming to a big mountain!" + + + + + CHAPTER XXVIII + + THE TEMPLE OF TREASURE + + +"What's that?" fairly yelled the professor. + +"We am propelling ourselves in a contiguous direction an' in close +proximity to an elevated portion of th' earth's surface which rises in +antiguous proximity t' th' forward part of our present means of +locomotion!" said the colored man in a loud voice. + +"Which means there may be a collision," the professor said, as he and +the boys hurried toward the tower. + +"Jest what I said," retorted Washington. "What'll I do?" + +"Send the ship a little higher," answered Mr. Henderson. "We mustn't hit +any mountains." + +Washington forced more gas into the holder, and speeded the negative +gravity machine up some, so that the _Mermaid_, which was flying rather +low, ascended until it was in no danger of colliding with the peak which +reared its lofty height just ahead of them. + +As the ship sailed slowly over the mountain, Mark gazed down and +exclaimed: + +"Doesn't that look like the ruins of some building?" + +The professor took a pair of field glasses from a rack in the wall and +took a long view. + +"It must be the place," he said in a low voice. + +"What place?" asked Jack. + +"The temple of treasure," was the answer. "Hankos told me it was on top +of the highest mountain in the land, and this must be it, for it is the +loftiest place we have seen. But we must be careful, for there is danger +down there." + +"What kind?" asked Mark. + +"The place was long ago deserted by the giants," Mr. Henderson went on. +"Ages ago it was one of their storehouses for treasure, but there were +wars among themselves, Hankos said, and this part of the country was +laid waste. Savage beasts took up their abode in the temple, and since +then, in spite of the great size of the giants, they have not dared to +venture here. If we brave the animals we may have all the gold and +diamonds we can take away." + +"Then for one, I'm willin' t' go down an' begin th' extermination at +once," put in Andy. "I've always wanted t' be rich." + +"We must proceed cautiously," the professor said. "We are ill prepared +to fight any such beasts as we saw at the big geyser. At the same time +they may have deserted this place. I think we will lower the ship down +over the temple, and spend several hours in observation. Then, if +nothing develops, we can enter and see if the treasure is there." + +This plan was voted a good one, and the _Mermaid_ after having been +steered directly over the ruined temple, was brought to a halt, and +enough gas let out so that it fell to about fifty feet in the air above +it. + +The adventurers began their watch. The afternoon waned and there were no +signs of any beasts in or about the temple. + +"I reckon we can take a chance," said Andy, who was anxious to get his +hands on some diamonds. + +"Better wait until morning," counseled Mr. Henderson. "It will soon be +dark, and it doesn't look like a nice place to go stumbling about in by +moonlight." + +So, though all but the scientist were anxious, they had to wait until +the night had passed. Several times Washington got up to see if the +temple had, by any chance, taken wings during the long hours of +darkness, but each time he found it was still in place. + +"Seems laik it'll never come mornin'," he said. + +But dawn came at length, and, after a hasty breakfast, preparations to +enter the temple were made. Andy loaded his gun for "bear" as he +expressed it, and the boys each took a revolver. + +The ship was lowered to as level a place as could be found, and then, +seeing that everything was in readiness for a quick departure, the +professor led the way out of the _Mermaid_. + +The entrance to the temple was through a big arched gateway. Some of the +stones had fallen down, and the whole structure looked as if it might +topple over at any moment. + +"Go carefully," cautioned Mr. Henderson. "Watch on all sides and up +above. Better let Andy and me go ahead." + +The scientist and the old hunter led the way. Through the arch they +went, and emerged into what must at one time have been a magnificent +courtyard. Before them was the temple proper, a vast structure, with an +opening through which fifty men might have marched abreast. But the +doors were gone, and the portal was but a black hole. + +"I hope there ain't any ghosts in there," said Washington, with a +shiver. + +"Nonsense!" exclaimed the professor. "There may be things as bad, but +there are no such things as ghosts. Have your gun ready, Andy." + +With every sense on the alert, the old hunter advanced. Every one was a +bit nervous, and, as Mark and Jack afterward admitted, they half +expected some terrible beast to rush out at them. But nothing of the +kind happened, and they went into the interior of the temple. + +At first it was so dark they could see nothing. There were vast dim +shapes on every side, and from the hollow echo of their footsteps they +judged the roof must be very high and the structure big in every way. + +Then, as their eyes became used to the darkness, they could make out, up +front, something like an altar or pulpit. + +"Perhaps that's where they offered up the gold and diamonds as a +sacrifice to their gods," spoke Mark in a whisper. + +"Sacrifice to their gods!" came back a hundred echoes and the sound made +every one shudder. + +"Oh!" said Washington, in a low voice. + +"Oh! Oh! Oh!" repeated the echoes in voices of thunder. + +"Well, this is pleasant," spoke Andy, in his natural tones, and, to the +surprise of all there was no echo. It was only when a person whispered +or spoke low that the sound was heard. After that they talked naturally. + +"You stay here, and Andy and I will go up front and see what there is," +said Mr. Henderson. "Be on your guard, and if you hear us coming back in +a hurry, run!" + +It was with no little feeling of nervousness that the boys, Bill, Tom +and Washington watched the two men move off in the darkness. They could +hear their footsteps on the stone flags and could dimly see them. + +"They must be almost to the altar by this time," said Mark, after a long +pause. + +Hardly had he spoken than there came a loud sound from where Mr. +Henderson and Andy had gone. It was as if some giant wings were beating +the air. Then came shrill cries and the voice of the old hunter could be +heard calling: + +"Kneel down, Professor! Let me get a shot at the brute!" + +Those waiting in the rear of the temple huddled closer together. What +terrible beast could have been aroused? + +The next instant the place seemed illuminated as if by a lightning +flash, and a sound as of a thousand thunder claps resounded. + +"I think I winged him!" cried Andy's voice, and the boys knew he had +fired at something. + +Then there came a crash, and from the roof of the old temple a dozen +stones toppled off to one side, letting in a flood of colored light. + +By this illumination could be seen, flapping through the big space +overhead, an enormous bat, as large as three eagles. And, as it flew +about in a circle it gave utterance to shrill cries. + +"Bang!" Andy's gun spoke again, and the bat with a louder cry than +before, darted through the hole in the roof made by the falling stones, +which had been loosened by the concussion from the rifle. + +"Come on!" cried the old hunter. "That was the guardian of the treasure! +We are safe now!" + +Then, in the light which streamed through the broken roof, the +adventurers could see, heaped up on a great altar, behind which sat a +horrible graven image, piles of yellow metal, and sparkling stones. In +little heaps they were, arranged as if offerings to the terrible god of +the giants. There were bars and rings of gold, dishes of odd shape, and +even weapons. As for the sparkling stones, they were of many colors, but +the white ones were more plentiful than all the others. + +"Gold and diamonds! Diamonds and gold!" murmured the professor. "There +is the ransom of many kings in this ancient temple." + +"Wish I had a big bag!" exclaimed Washington, as he began filling all +his pockets with the precious metal and gems. "If I had a-thought I'd +have brought a dress-suit case!" + +"A dress-suit case full of diamonds!" exclaimed Mark. + +Then he too, as did all the others, fell to filling his pockets with the +wealth spread so lavishly before them. There was the riches of a whole +world in one place and no one but themselves to take it. + +For several minutes no one spoke. The only sound was the rattle of the +stones and the clink of gold, and when some of the diamonds dropped on +the floor they did not bother to gather them up. There were too many on +the altar. + +"We will be rich for life!" gasped old Andy, who had been poor all his +years. + +"I can't carry any more!" gasped Washington. "I'm goin' back for----" + +What he was going back for he never said, for, at that instant, +happening to look up at the hole in the roof, he gave a startled cry: + +"Here come the terrible bats!" + +They all gazed upward. Through the opening they could see a great flock +of the awful birds, headed for the temple, and they were led by one +which seemed to fly with difficulty. It was the guardian of the treasure +that Andy had wounded. + +"Quick! We must get out of here!" shouted the old hunter. "They are big +enough and strong enough to tear us all to pieces. Hurry!" + +Down the centre of the temple they rushed, and not a moment too soon, +for, ere they had passed half way to the entrance, the opening in the +roof was darkened by the coming of the bats, and soon the flapping of +their wings awoke the thundering echoes in the ruined structure, while +their shrill cries struck terror to the hearts of the travelers. + +Up to the altar circled the bats, and then wheeling they flapped down +the dim aisles toward the adventurers. + +"Hurry! Hurry!" shouted Andy, who was in the rear. + +He raised his rifle and fired several shots into the midst of the +terrible creatures. + +A number of the bats were wounded, and the others were so frightened by +the sound of the shots and the flashes of fire that they turned back. +This enabled the fleeing ones to gain the entrance to the temple, and +soon they were outside. + +"To the ship!" yelled Bill. + +"There's little danger now!" called Andy, panting, for the run had +winded him. "They will hardly attack us in the light!" + +And he was right, for, though they could hear the bats flying about +inside the temple, and uttering their cries, none came outside. + +But no one felt like staying near the uncanny structure, and little time +was lost in reaching the _Mermaid_. Then the doors were fastened, and +the ship was sent high up into the air. + +"Which way?" asked Jack, when Mr. Henderson told him to go to the +conning tower and steer. + +"Back to where we first met the giants," replied the professor. "We must +prepare to start for our own earth again soon." + +"I've almost forgotten how real sunlight looks," thought Jack, as he +headed the ship around the other way. As he turned the levers a big +diamond dropped from his pocket and rolled on the floor. + +"This will be a good reminder of our trip though," he added. + +The travelers, even including Mr. Henderson, were so taken up with their +suddenly acquired riches that they hardly thought of meals. At the +professor's suggestion they tied their gold and stones up in small +packages convenient to carry. + +"Better place them where you can grab them in a hurry in case of +accident," the old scientist went on. "Of course if there should be too +bad an accident they would never be of any use to us down here, but +we'll look on the bright side of things." + +"Do you anticipate any accident?" asked Jack anxiously. + +"No, Oh no," replied Mr. Henderson, but Jack thought the aged man had +something weighing on his mind. + + + + + CHAPTER XXIX + + BACK HOME--CONCLUSION + + +On and on sped the _Mermaid_. Now that the travelers felt their journey +accomplished they were anxious to begin the homeward trip. They made a +straight course for the village where they had so nearly met with +disaster, and where the king of the giants had saved them. They went in +a direct line, and did not travel here and there, as they had after they +left the town. Consequently they shortened the route by a great +distance. Yet it was long enough, and when they finally came in sight of +the place the dial registered a trip of five thousand miles underground. + +It was one evening when they landed almost at the spot whence they had +taken flight eventually to reach the temple of the treasure. Most of the +giants had betaken themselves to their mound houses, but Hankos was +walking in the fields, and, when he caught sight of the airship hovering +above him he waved his great sword in welcome. + +He rushed up to shake hands with the travelers when they came out of the +ship, though to greet him it was only possible for the adventurers to +grasp one of his immense fingers. + +As soon as the greetings were over Hankos began to speak rapidly to the +professor, at the same time going through many strange motions. + +"It is as I feared!" suddenly exclaimed the scientist. + +"What is the matter?" asked Mark. + +"The worst has happened!" went on Mr. Henderson. "The great hole by +which we came into this place has been closed by an earthquake shock!" + +"The hole closed?" repeated Jack. + +"An earthquake shock!" murmured Mark. + +"Then how are we going to get back to earth?" asked old Andy. + +A terrible fear entered the hearts of the travelers. The closing of the +opening by which they had come to the strange world meant, in all +probability that they would have to spend the rest of their lives in +this underground place. + +"What good did it do us to get all those diamonds and that gold?" asked +Mark in a sorrowful tone. + +Hankos began to speak again, using his gestures which were almost as +eloquent as words. The professor watched and listened intently. Then +there seemed to come a more hopeful look to his face. He nodded +vigorously as Hankos went on with what seemed to be an explanation. + +"It's worth trying, at all events!" the scientist exclaimed. "It is our +only hope!" + +"What is?" asked Jack. + +"Friends," began the professor in solemn tones. "I must admit our plight +is desperate. At the same time there is a bare chance of our getting +back to our own earth. As you remember, Hankos went from this place to +the upper regions through the upward spouting column of water." + +"If we had our submarine we might also," interrupted Jack. "But the +_Mermaid_ isn't built to sail in that fashion." + +"Nor would the _Porpoise_ have served us in this emergency," said the +professor. "It would prove too heavy. But, nevertheless, I think I have +a plan. Now, Mark, you are about to learn the secret of the storeroom. +The real one, not the hiding of Hankos in there, which you imagined to +be the cause of my desire to keep something hidden. When we planned a +trip to this underground world I had a dim idea that we might meet with +trouble. So I planned and made a cylinder lifeboat." + +"A cylinder lifeboat?" repeated Mark. + +"Yes," replied Mr. Henderson. "I have it in the storeroom. I did not +want any of you to see it for fear you would have faint hearts. I +thought there might be no necessity of using it. But, since there is, we +must do our best. I will admit it may be a fearful ordeal, but we will +have to risk something in order to escape. + +"I have in the storeroom a large cylinder, capable of holding us all. It +will also contain food and drink for a month, but we will all have to +go, packed almost like sardines in a box. My plan is to take the +_Mermaid_ to the place where the column of water shoots up. There we +will get into the cylinder, close it, and trust ourselves to the +terrible force that may bring us back to the upper world. What do you +say? Shall we attempt it?" + +For a few seconds no one spoke. Then Jack said slowly: + +"I don't see that we can do anything else. I don't want to stay here all +my life." + +"I wants a chance t' wear some of them sparklers," put in Washington. + +"Then we will make the attempt," the professor added. "Now all aboard +for the place where the water shoots up!" + +Questioning Hankos, the professor learned how to reach the strange +place. It was in the midst of a desolate country where none of the +giants ever went, so afraid were they of the strange phenomenon. + +It was a week's journey. Sometimes the _Mermaid_ flew through the air, +and again it sailed on vast lakes or inland seas. On the trip they met +with big waterfalls and terrible geysers that spouted a mile or more +into the air. They traveled by night as well as day, though it was +necessary to keep a sharp watch. + +Sometimes the ship passed through great flocks of birds that surrounded +her and sought to pierce the aluminum hull with their sharp beaks and +talons. Over the mountains and valleys the ship sailed until, one +evening, there sounded through the air a strange rumbling sound. + +"It is thunder," said Old Andy. + +"It is the water column," replied the scientist. "We are at the end of +our trip. May the remainder be as successful!" + +The ship was lowered to the surface, as it was deemed best to approach +the column when the lights were shining. No one slept much that night, +for the roaring and rumbling never ceased. + +In the morning the ship was sent forward slowly. Ever and ever the +terrific sound increased, until it was almost deafening. They had to +call to each other to be heard. + +Then, as the _Mermaid_ passed over a mountain, the adventurers saw, in a +valley below them, the up-shooting water. + +It was a vast column, nearly three hundred feet in thickness, and as +solid and white as a shaft _of_ marble. Up, up, up, it went, until it +was lost to sight, but there were no falling drops, and not even a spray +came from the watery shafts. + +"There is a terrible power to it," the professor said. "May it prove our +salvation!" + +The ship was lowered about a hundred feet away from the waterspout. All +around them the ground was vibrating with the force of the fluid. + +"To think that connects with the world above!" exclaimed Jack. + +"It's a good thing for us that it does," Mark answered. + +"We must lose no time," the professor put in. "If the earthquake +destroyed the downward shaft, it may effect this one in time. We must +escape while we can." + +Then, for the first time, he opened the storeroom and the big cylinder +was disclosed to view. It was made of aluminum, and shaped like an +immense cigar. The hull was double, and it was strongly braced. Inside +were padded berths for the occupants, and there was just room enough for +the seven adventurers. Once they had entered they could not move about, +but must stay in their little compartment. + +Compressed air in strong cylinders furnished a means of breathing, and +there were tiny electric lights operated by a storage battery. There was +also a chamber to be filled with the lifting gas. The cylinder was so +arranged that it would float on it's long axis if thrown into the water. +A trap door hermetically sealed gave access to the interior. A small +propellor, worked by compressed air, furnished motive power. + +The food supply consisted of compressed capsules on which a man could +subsist for several days. There was also some water, but not much, since +that can not be compressed and would, therefore, take considerable room. + +"The only thing for us to do," said the professor, "is to get into the +cylinder, seal it up, and trust to Providence. This is what I intended +to use when we were caught in the draught." + +"How can we get into the column of water after we shut ourselves into +the cylinder?" asked Mark. + +"The cylinder fits into a sort of improvised cannon," said Mr. +Henderson. "It is fired by electricity and compressed air. We will aim +it at the column, press the button and be projected into the midst of +the water. Then----" He did not finish the sentence, but the others knew +what he meant. + +"When are we to start?" asked Mark. + +"As soon as possible," replied the professor. "I must arrange the +cylinder, compress the air and lay out the food supply." + +It took the rest of the day to do this, as the inventor found it would +be advisable to attach a weight to the end of the cylinder, to hold it +upright in the column of water. The weight could be detached +automatically when they were shot up into the midst of the ocean, where, +as Hankos had told them, the column spurted forth. + +Then some food was stored in the tiny ship that was destined to be their +last hope, and some tanks of water were placed in it. + +"I think we are almost ready," Mr. Henderson said about noon the next +day. + +"What about our gold and diamonds?" asked Jack suddenly. "Can we take +them with us in the cylinder?" + +"That's so!" exclaimed Mr. Henderson. "I forgot about them. I'm afraid +we'll have to leave the riches behind. We will not be able to carry them +and the food we need, for it may be a week or more before we can leave +the cylinder. Gold and diamonds will be a poor substitute for something +to eat." + +"I'm goin' t' take mine!" said Washington with much conviction. "I might +as well starve rich as starve poor!" + +"We may be able to take a few diamonds," the professor answered. "The +gold will be too heavy. Let each one select the largest of the diamonds +he has and put them in his pockets." + +Then began a sorting of the wealth. It was strange, as they recalled +afterward, throwing away riches that would have made millionaires +envious, but it had to be done. All the wealth in the world would not +equal a beef capsule when they were starving, and they realized it. So +they only saved a few pieces of gold as souvenirs, and took the best of +the diamonds. But even then they had a vast fortune with them. + +At last all was in readiness. The cylinder had been placed in the tube +from which it was to be shot gently forth by compressed air, so that it +would fall into the upward spouting column of water. The charge of +compressed air was put in and the electric wires arranged. + +"Are we all ready?" asked Mr. Henderson. + +"I think so," said Jack, in what sounded like a whisper, but which was +loud, only the noise of the water muffled it. + +"Then we had better enter the cylinder," spoke the inventor. "Take a +last look at the _Flying Mermaid_, boys, for you will never see again +the ship that has borne us many thousand miles. She served us well, and +might again, but for the freak of nature that has placed us in this +position." + +For the first time the adventurers realized that they must abandon the +craft in which they had reached the new world. So it was with no little +feeling of sadness that they climbed up the ladder that had been +arranged and slid down into the cylinder. One by one they took their +places in the padded berths arranged for them. It was a snug fit, for +the professor knew if there was too much room he and the others might be +so tossed about as to be killed. + +Mr. Henderson was the last to enter. Standing at the manhole he took a +final look at his pet creation, the _Mermaid_. Through the opened +windows the colored lights came, shifting here and there. Outside the +terrible column of water was roaring as if anxious to devour them. + +"Good-bye, _Mermaid_!" said the professor softly. + +Then he closed down the manhole cover and tightened the screws that held +it in place. He touched a button that turned on the electric lights and +the interior of the cylinder was illuminated with a soft glow. + +"Are you all ready?" he asked. + +"Jest as much as I ever will be," replied Washington, who, as the crisis +approached, seemed more light-hearted than any of the others. + +"Then here we go!" exclaimed Mr. Henderson. + +His fingers touched the button that connected with the electric machine, +which operated the compressed air. + +There sounded a muffled report. Then it seemed to those in the cylinder +that the end of the world had come. They shot upward and outward, +through the top of the conning tower which had been removed. The +cylinder, launched straight at the column of water struck it squarely +and, an instant later was caught in the grasp of the giant force and +hurled toward the upper world. + +Up and up and up the mass of metal with its human freight went. Now it +was spinning like a top, again it shot toward the earth's crust like an +arrow from the archer's bow. + +It was moving with the velocity of a meteor, yet because of being +surrounded with water, and traveling with the same velocity as the +column, there was no friction. Had there been, the heat generated would +have melted the case in an instant. + +For the first few seconds those in the cylinder were dazed by the sudden +rush. Then as it became greater and greater there came a curious dull +feeling, and, one after another lost consciousness. The terror of the +water column, and the frightful speed, had made them senseless. + + * * * * * + +It seemed like a month later, though, of course, it could have been only +a few hours or a day at most when Jack opened his eyes. He saw his +companions, white and senseless all around him, and at first thought +they were dead. Then he saw Mark looking at him, and Washington asked: + +"Is any one livin' 'sides me?" + +"I am," replied Jack decidedly. + +Then, one after another they regained their senses. But they were in a +strange daze, for they were being carried along like a shooting star, +only, as they went at the same rate as did the element carrying them, +they did not _realize_ this. + +"I think I'm hungry," said Bill, who had the best appetite of any of the +travelers. + +"You'll find a beef capsule in the little compartment over your head," +spoke the professor. + +Bill was about to reach for it, when they were all startled by a sudden +side motion of the cylinder. Then came a violent shock, and a sound as +of splashing water. Next the cylinder seemed to be falling, and, a few +minutes later to be shooting upward. Following this there was another +splash and the cylinder began to bob about like a cork on a mill pond. + +"We have reached the sea! We are afloat on the ocean!" cried the +professor. + +Hurriedly he disengaged himself from the straps that held him to his +bunk. He pushed back the lever that opened the manhole. Into the opening +glowed the glorious sunlight, while to the occupants came the breath of +salt air. + +"Hurrah!" cried Jack. "We are safe at last!" + +"Safe at last!" the professor answered, and then they all gave a cheer. + +For their cylinder, which might now be termed a boat, was floating on +the great Atlantic. The blue sky was overhead and the air of the sea +fanned their cheeks. + +They had shot up from the underground earth, in the column of water, had +been tossed high into the air, had fallen back when the liquid shaft +broke into spray, had descended into the ocean, gone down a hundred feet +or more, and then had shot up like a cork to bob about the surface. + +For a week they were afloat, and then they were picked up by a passing +vessel, rather weak and very much cramped, but otherwise in good shape. +They said nothing of their adventures, save to explain that they were +experimenting in a new kind of boat. About a month later, for the ship +that had rescued them was a slow sailer, they were back on the island +whence that wonderful voyage was begun. + + * * * * * + +"Well, we solved the mystery of the center of the earth," remarked Jack, +one evening, when they were gathered in the old shack where so many +wonderful adventures had been planned. + +"Yes, we did," said Mr. Henderson. "And no one else is ever likely to go +there." + +"Why?" + +"Because the only way of getting there was destroyed by the earthquake, +and no one could ever force his way down through that upward-shooting +column of water." + +"That's so. Well, we have the diamonds, anyway," spoke Mark. "They ought +to make us rich." + +And the jewels did, for the stones proved to be of great value, even +though the adventurers had saved only a few of the many they found in +the ruined temple. + +But there was money enough so that they all could live in comfort the +rest of their lives. As the professor was getting quite old, and +incapable of making any more wonderful inventions, he closed up his +workshop and settled down to a quiet life. As for Washington, Andy, and +Bill and Tom, they invested their money received from the sale of the +diamonds in different business ventures, and each one did well. + +"I am going in for a good education," said Jack to Mark. + +"Just what I am going to do," answered his chum. "And after we've got +that----" He paused suggestively. + +"We'll go in for inventing airships, or something like that, eh?" + +"Yes. We've learned a great deal from Mr. Henderson, and in the course +of time we ought to be able to turn out something even more wonderful +than the _Electric Monarch_, the _Porpoise_, or the _Flying Mermaid_." + +"Yes, and when we've invented something better----" + +"We'll take another trip." + +"Right you are!" + +And then the two chums shook hands warmly; and here we will say +good-bye. + + THE END. + +------------------------------------------------------------------------ + + NEW ALGER BOOKS + + JOE, THE HOTEL BOY + Or, Winning Out by Pluck + By HORATIO ALGER, Jr. + + Illustrated, 12mo. Cloth, 60 cents + +[Illustration: small image of book cover] + +This is one of the last stories penned by that prince of all juvenile +writers, Horatio Alger, Jr., and is one of his best. It describes the +adventures of a youth brought up in the country by an old hermit. When +the hermit dies the boy obtains work at a nearby hotel, and later on +drifts to the city and obtains a position in another hotel. There is a +mystery concerning the lad's identity and likewise the disappearance of +a certain blue box, but in the end all terminates satisfactorily. + + BEN LOGAN'S TRIUMPH + Or, The Boys of Boxwood Academy + By HORATIO ALGER, Jr. + + Illustrated, 12mo. Cloth, 60 cents + +[Illustration: small image of book cover] + +This story was penned by Mr. Alger some years before his death, but has +never appeared in book form. Ben was a city newsboy, rather rough, but +with a heart of gold. He did a great service for a good-hearted farmer, +and the latter took Ben home with him. The lad had never been in the +country before, and his eyes were opened to a new world. Then the youth +was sent to a boarding school, where he made his way to the front amid +many difficulties. Mr. Alger's charm as a juvenile writer is so well +known it is needless to mention it here, and this story is in his best +vein. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + THE JACK RANGER SERIES + By Clarence Young + Author of the Motor Boys Series + + Cloth. 12mo. Illustrated, Price per volume, $1.00, postpaid + +[Illustration: small image of book cover] + + JACK RANGER'S SCHOOLDAYS + Or, The Rivals of Washington Hall + +You will love Jack Ranger--you simply can't help it. He is so bright and +cheery, and so real and lifelike. A typical boarding school tale, +without a dull line in it. + + JACK RANGER'S SCHOOL VICTORIES + Or, Track, Gridiron and Diamond + +In this tale Jack gets back to Washington Hall and goes in for all sorts +of school games. There are numerous contests on the athletic field, and +also a great baseball game and a football game, all dear to a boy's +heart. The rivalry is bitter at times, and enemies try to put Jack "in a +hole" more than once. + + JACK RANGER'S WESTERN TRIP + Or, From Boarding School to Ranch and Range + +This volume takes the hero and several of his chums to the great West. +Jack is anxious to clear up the mystery surrounding his father's +disappearance. At the ranch and on the range adventures of the strenuous +sort befall him. + + JACK RANGER'S OCEAN CRUISE + Or, The Wreck of the Polly Ann + +Here is a tale of the bounding sea, with many stirring adventures. How +the ship was wrecked, and Jack was cast away, is told in a style all +boys and girls will find exceedingly interesting. There is plenty of fun +as well as excitement. + + JACK RANGER'S GUN CLUB + Or, From Schoolroom to Camp and Trail + +Jack, with his chums, goes in quest of big game. The boys fall in with a +mysterious body of men, and have a terrific slide down a mountain side. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + THE DOROTHY DALE SERIES + By Margaret Penrose + + Cloth, 12mo. Illustrated. Price per volume, 60 cents, postpaid + + DOROTHY DALE: A GIRL OF TO-DAY + +Dorothy is the daughter of an old Civil War veteran who is running a +weekly newspaper in a small Eastern town. When her father falls sick, +and the newspaper property is in danger of going to pieces, the girl +shows what she can do to support the family. + +[Illustration: small image of book cover] + + DOROTHY DALE AT GLENWOOD SCHOOL + +More prosperous times have come to the Dale family, and Major Dale +resolves to send Dorothy to a boarding school to complete her education. +At Glenwood School the girl makes a host of friends and has many good +times. But some girls are jealous of Dorothy's popularity, and they seek +to get her into trouble in more ways than one. + + DOROTHY DALE'S GREAT SECRET + +A splendid story of one girl's devotion to another. Dorothy's chum ran +away to join a theatrical company. What Dorothy did, and how she kept +the secret, makes a tale no girl will care to miss. + + DOROTHY DALE AND HER CHUMS + +A story of school life, and of strange adventures among the gypsies. +Dorothy befriends a little French girl and also a gypsy waif, in a +manner sure to touch the hearts of all readers. + + DOROTHY DALE'S QUEER HOLIDAYS + +Relates the details of a mystery that surrounded Tanglewood Park. There +is a great snowstorm, and the young folks become snowbound, much to +their dismay. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + BOYS OF BUSINESS SERIES + By Allen Chapman + + Illustrated, 12mo. Cloth, 60 cents per volume + +[Illustration: small image of book cover] + + THE YOUNG EXPRESS AGENT + Or, Bart Stirling's Road to Success + +Bart's father was the express agent in a country town. When an explosion +of fireworks rendered him unfit for work, the boy took it upon himself +to run the express office. The tale gives a good idea of the express +business in general. + + TWO BOY PUBLISHERS + Or, From Typecase to Editor's Chair + +This tale will appeal strongly to all lads who wish to know how a +newspaper is printed and published. The two boy publishers work their +way up, step by step, from a tiny printing office to the ownership of a +town paper. + + MAIL ORDER FRANK + Or, A Smart Boy and His Chances + +Here we have a story covering an absolutely new field--that of the +mail-order business. How Frank started in a small way and gradually +worked his way tip to a business figure of considerable importance is +told in a fascinating manner. + + A BUSINESS BOY + Or, Winning Success + +This relates the ups and downs of a young storekeeper. He has some keen +rivals, but "wins out" in more ways than one. All youths who wish to go +into business will want this volume. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + MOTOR BOYS SERIES + (Trade Mark, Reg. U. S. Pat. Of.) + By Clarence Young + + Cloth. 12mo. Illustrated. Price per volume. 60 cents, postpaid + +[Illustration: small image of book cover] + + THE MOTOR BOYS + Or, Chums Through Thick and Thin + +In this volume is related how the three boys got together and planned to +obtain a touring car and make a trip lasting through the summer. + + THE MOTOR BOYS OVERLAND + Or, A Long Trip for Fun and Fortune + +With the money won at the great motorcycle race the three boys purchase +their touring car and commence their travels. + + THE MOTOR BOYS IN MEXICO + Or, The Secret of the Buried City + +From our own country the scene is shifted to Mexico, where the motor +boys journey in quest of a city said to have been buried centuries ago +by an earthquake. + + THE MOTOR BOYS ACROSS THE PLAINS + Or, The Hermit of Lost Lake + +Unraveling the mystery surrounding an old hermit and a poor boy. + + THE MOTOR BOYS AFLOAT + Or, The Stirring Cruise of the Dartaway + +In this volume the boys take to a motorboat, and have many adventures. + + THE MOTOR BOYS ON THE ATLANTIC + Or, The Mystery of the Lighthouse + +How the lads foiled the bad men who wanted to wreck a steamer by means +of false lights is dramatically related. + + THE MOTOR BOYS IN STRANGE WATERS + Or, Lost in a Floating Forest + +Telling of many adventures in the mysterious Everglades of Florida. + + THE MOTOR BOYS ON THE PACIFIC + Or, The Young Derelict Hunters + +The derelict was of great value, and the hunt for it proved full of +perils. + + THE MOTOR BOYS IN THE CLOUDS + Or, A Trip for Fame and Fortune + +The boys fall in with an inventor and invest in a flying machine. After +a number of stirring adventures in the clouds they enter a big race. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + THE BOY HUNTERS SERIES + By Captain Ralph Bonehill + + Cloth. 15mo. Illustrated. Price per volume, 60 cents, postpaid + +[Illustration: small image of book cover] + + FOUR BOY HUNTERS + Or, The Outing of the Gun Club + +A fine, breezy story of the woods and waters, of adventures in search of +game, and of great times around the campfire, told in Captain Bonehill's +best style. In the book are given full directions for camping out. + + GUNS AND SNOWSHOES + Or, The Winter Outing of the Young Hunters + +In this volume the young-hunters leave home for a winter outing on the +shores of a small lake. They hunt and trap to their heart's content, and +have adventures in plenty, all calculated to make boys "sit up and take +notice." A good healthy book; one with the odor of the pine forests and +the glare of the welcome campfire in every chapter. + + YOUNG HUNTERS OF THE LAKE + Or, Out with Rod and Gun + +Another tale of woods and waters, with some strong hunting scenes and a +good deal of mystery. The three volumes make a splendid outdoor series. + + OUT WITH GUN AND CAMERA + Or, The Boy Hunters in the Mountains + +Takes up the new fad of photographing wild animals as well as shooting +them. An escaped circus chimpanzee and an escaped lion add to the +interest of the narrative. + + CUPPLES & LEON CO., Publishers, NEW YORK + +------------------------------------------------------------------------ + + THE DAREWELL CHUMS SERIES + By Allen Chapman + + Cloth. 12mo. Illustrated. 60 cents each, postpaid. + + THE DAREWELL CHUMS + Or, The Heroes of the School + +A bright, lively story for boys, telling of the doings of four chums, at +school and elsewhere. There is a strong holding plot, and several +characters who are highly amusing. Any youth getting this book will +consider it a prize and tell all his friends about it. + + THE DAREWELL CHUMS IN THE CITY + Or, The Disappearance of Ned Wilding + +From a country town the scene is changed to a great city. One of the +chums has disappeared in an extraordinary manner, and the others +institute a hunt for him. The youths befriend a city waif, who in turn +makes a revelation which clears up the mystery. + +[Illustration: small image of book cover] + + DAREWELL CHUMS IN THE WOODS + Or, Frank Roscoe's Secret + +The boys had planned for a grand outing when something happened of which +none of them had dreamed. They thought one of their number had done a +great wrong--at least, it looked so. But they could not really believe +the accusations made, so they set to work to help Frank all they could. +All went camping some miles from home, and when not hunting and fishing +spent their time in learning the truth of what had occurred. + + THE DAREWELL CHUMS ON A CRUISE + Or, Fenn Masterson's Odd Discovery + +A tale of the Great Lakes. The boys run across some Canadian smugglers +and stumble on the secret of a valuable mine. Some curious adventures +underground are well told. + + CUPPLES & LEON CO., Publishers, NEW YORK + + + + + + +End of Project Gutenberg's Five Thousand Miles Underground, by Roy Rockwood + +*** END OF THIS PROJECT GUTENBERG EBOOK FIVE THOUSAND MILES UNDERGROUND *** + +***** This file should be named 4994.txt or 4994.zip ***** +This and all associated files of various formats will be found in: + http://www.gutenberg.org/4/9/9/4994/ + +Produced by Jim Weiler and Roger Frank + +Updated editions will replace the previous one--the old editions +will be renamed. + +Creating the works from public domain print editions means that no +one owns a United States copyright in these works, so the Foundation +(and you!) can copy and distribute it in the United States without +permission and without paying copyright royalties. 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