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authorwww-data <www-data@mail.pglaf.org>2026-07-10 19:06:16 -0700
committerwww-data <www-data@mail.pglaf.org>2026-07-10 19:06:16 -0700
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+ On the Mechanism of the Eye | Project Gutenberg
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+<body>
+<div style='text-align:center'>*** START OF THE PROJECT GUTENBERG EBOOK 79069 ***</div>
+
+
+<div class="transnote">
+<p><b><a id="Transcribers_notes"></a>Transcriber’s notes</b>:</p>
+
+<p>This e-book comprises the text of a lecture delivered on November
+27, 1800 and subsequently published in the <i>Philosophical Transactions
+of the Royal Society</i>, Issue 91 (1801), pp. 23–88</p>
+
+<p>It retains the original page numbering and includes 57 Figures that
+are grouped together in seven Plates near the end of the lecture text.
+Cross references to the figures have been hyperlinked to the relevant
+plate containing the figure but return links back to the x-refs are not
+possible. Footnotes have been numbered consecutively and moved to the
+end. They are hyperlinked in both directions. The text contains
+sections of complex mathematics and some unfamiliar symbols.</p>
+
+<p>New original cover art included with this eBook is granted to the
+public domain.</p>
+</div>
+
+<p class="tac fs130 ls01em">The Philosophical Transactions of the Royal Society</p>
+
+<p class="surtitle">The Bakerian Lecture:</p>
+<p><span class="pagenum" id="Page_23">23</span></p>
+
+<h1>
+On the Mechanism of the Eye
+</h1>
+
+<p class="tac ws02em fs120">by Thomas Young M.D. F.R.S.</p>
+
+<p class="tac mtb1em">Read November 27, 1800.</p>
+
+
+<p class="mt2em ti0">I. In the year 1793, I had the honour of laying before the
+Royal Society, some observations on the faculty by which the
+eye accommodates itself to the perception of objects at different
+distances.‍&#x2060;<a id="FNanchor_1_1" href="#Footnote_1_1" class="fnanchor">1</a> The opinion which I then entertained, although it
+had never been placed exactly in the same light, was neither so
+new, nor so much forgotten, as was supposed by myself, and
+by most of those with whom I had any intercourse on the subject.
+Mr. <span class="smcap">Hunter</span>, who had long before formed a similar opinion,
+was still less aware of having been anticipated in it, and
+was engaged, at the time of his death, in an investigation of the
+facts relative to it;‍&#x2060;<a id="FNanchor_2_2" href="#Footnote_2_2" class="fnanchor">2</a> an investigation for which, as far as
+physiology was concerned, he was undoubtedly well qualified.
+Mr. <span class="smcap">Home</span>, with the assistance of Mr. <span class="smcap">Ramsden</span>, whose recent
+loss this Society cannot but lament, continued the inquiry
+which Mr. <span class="smcap">Hunter</span> had begun; and the results of his experiments
+appeared very satisfactorily to confute the hypothesis of
+the muscularity of the crystalline lens.‍&#x2060;<a id="FNanchor_3_3" href="#Footnote_3_3" class="fnanchor">3</a> I therefore thought
+it incumbent on me, to take the earliest opportunity of testifying
+my persuasion of the justice of Mr. <span class="smcap">Home</span>’s conclusions,
+which I accordingly mentioned in a Dissertation published at
+<span class="pagenum" id="Page_24">24</span>Gottingen in 1796,‍&#x2060;<a id="FNanchor_4_4" href="#Footnote_4_4" class="fnanchor">4</a> and also in an Essay presented last year
+to this Society.‍&#x2060;<a id="FNanchor_5_5" href="#Footnote_5_5" class="fnanchor">5</a> About three months ago, I was induced to
+resume the subject, by perusing Dr. <span class="smcap">Porterfield</span>’s paper on
+the internal motions of the eye;‍&#x2060;<a id="FNanchor_6_6" href="#Footnote_6_6" class="fnanchor">6</a> and I have very unexpectedly
+made some observations, which I think I may venture to say,
+appear to be finally conclusive in favour of my former opinion,
+as far as that opinion attributed to the lens a power of changing
+its figure. At the same time, I must remark, that every person
+who has been engaged in experiments of this nature, will
+be aware of the extreme delicacy and precaution requisite, both
+in conducting them, and in drawing inferences from them; and
+will also readily allow, that no apology is necessary for the
+fallacies which have misled many others, as well as myself, in
+the application of those experiments to optical and physiological
+determinations.</p>
+
+
+<p class="mt2em ti0">II. Besides the inquiry respecting the accommodation of the
+eye to different distances, I shall have occasion to notice some
+other particulars relative to its functions; and I shall begin
+with a general consideration of the sense of vision. I shall
+then enumerate some dioptrical propositions subservient to my
+purposes, and describe an instrument for readily ascertaining
+the focal distance of the eye. On these foundations, I shall
+investigate the dimensions and refractive powers of the human
+eye in its quiescent state; and the form and magnitude of the
+picture which is delineated on the retina, I shall next inquire,
+how great are the changes which the eye admits, and what
+degree of alteration in its proportions will be necessary for
+these changes, on the various suppositions that are principally
+<span class="pagenum" id="Page_25">25</span>deserving of comparison. I shall proceed to relate a variety of
+experiments which appear to be the most proper to decide on
+the truth of each of these suppositions, and to examine such
+arguments as have been brought forwards, against the opinion
+which I shall endeavour to maintain; and I shall conclude with
+some anatomical illustrations of the capacity of the organs
+of various classes of animals, for the functions attributed to
+them.</p>
+
+
+<p class="mt2em ti0">III. Of all the external senses, the eye is generally supposed
+to be by far the best understood; yet so complicated and so
+diversified are its powers, that many of them have been hitherto
+uninvestigated; and on others, much laborious research has been
+spent in vain. It cannot indeed be denied, that we are capable
+of explaining the use and operation of its different parts, in a
+far more satisfactory and interesting manner than those of the
+ear, which is the only organ that can be strictly compared with
+it; since, in smelling, tasting, and feeling, the objects to be examined
+come almost unprepared into immediate contact with
+the extremities of the nerves; and the only difficulty is, in conceiving
+the nature of the effect produced by them, and its communication
+to the sensorium. But the eye and the ear are
+merely preparatory organs, calculated for transmitting the impressions
+of light and sound to the retina, and to the termination
+of the soft auditory nerve. In the eye, light is conveyed to
+the retina, without any change of the nature of its propagation:
+in the ear, it is very probable, that instead of the successive motion
+of different parts of the same elastic medium, the small bones
+transmit the vibrations of sound, as passive inelastic hard bodies,
+obeying the motions of the air in their whole extent at the same
+instant. In the eye, we judge very precisely of the direction of
+<span class="pagenum" id="Page_26">26</span>light, from the part of the retina on which it impinges: in the
+ear, we have no other criterion than the slight difference of motion
+in the small bones, according to the part of the tympanum on
+which the sound, concentrated by different reflections, first
+strikes; hence, the idea of direction is necessarily very indistinct,
+and there is no reason to suppose, that different parts of the
+auditory nerve are exclusively affected by sounds in different
+directions. Each sensitive point of the retina is capable of receiving
+distinct impressions, as well of the colour as of the
+strength of light; but it is not absolutely certain, that every
+part of the auditory nerve is capable of receiving the impression
+of each of the much greater diversity of tones that we can distinguish;
+although it is extremely probable, that all the different
+parts of the surface exposed to the fluid of the vestibule, are
+more or less affected by every sound, but in different degrees
+and succession, according to the direction and quality of the
+vibration. Whether or no, strictly speaking, we can hear two
+sounds, or see two objects, in the same instant, cannot easily be
+determined; but it is sufficient, that we can do both, without the
+intervention of any interval of time perceptible to the mind;
+and indeed we could form no idea of magnitude, without a comparative,
+and therefore nearly cotemporary perception of two
+or more parts of the same object. The extent of the field of
+perfect vision for each position of the eye, is certainly not very
+great; but it will appear hereafter, that its refractive powers are
+calculated to take in a moderately distinct view of a whole
+hemisphere: the sense of hearing is equally perfect in almost
+every direction.</p>
+
+<p><span class="pagenum" id="Page_27">27</span></p>
+
+
+<p class="mt2em ti0">IV. DIOPTRICAL PROPOSITIONS.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> I. <i>Phenomenon</i>.</p>
+
+<p>In all refractions, the ratio of the sine of the angle of
+incidence to the sine of the angle of refraction is constant.
+(<span class="smcap">Newton</span>’s Opt. I. Ax. 5. <span class="smcap">Smith</span>’s Opt. 13. <span class="smcap">Wood</span>’s Opt. 24.)</p>
+
+<p><i>Scholium</i> 1. We shall call it the ratio of <i>m</i> to <i>m</i> ⫧ 1, and
+<i>m</i> ⫧ 1, <i>n</i>. In refractions out of air into water, <i>m</i> = 4 and <i>n</i>
+= 3, very nearly; out of air into glass, the ratio is nearly that
+of 3 to 2.</p>
+
+<p><i>Scholium</i> 2. According to <span class="smcap">Barrow</span>, (<i>Lect. Opt</i>. ii 4.) <span class="smcap">Huygens</span>,
+<span class="smcap">Euler</span>, (<i>Conject. phys. circa prop, soni et luminis. Opusc. t. ii.</i>)
+and the opinion which I lately submitted to the Royal Society,
+(Phil. Trans. for 1800. p. 128,) the velocity of light is the greater
+the rarer the medium: according to <span class="smcap">Newton</span>, (Schol. Prop.
+96. l. i. Princip. Prop. 10. p. 3. l. ii. Opt.) and the doctrine
+more generally received, the reverse. On both suppositions, it
+is always the same in the same medium, and varies in the ratio
+of the sines of the angles. This circumstance is of use in facilitating
+the computation of some very complicated refractions.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> II. <i>Phenomenon</i>.</p>
+
+<p>If between two refracting mediums, a third medium, terminated
+by parallel surfaces, be interposed, the whole refraction
+will remain unchanged. (<span class="smcap">Newton</span>’s Opt. l. i. p. 2. Prop. 3.
+<span class="smcap">Smith</span>, r. 399. <span class="smcap">Wood</span>, 105.)</p>
+
+<p><i>Corollary</i>. Hence, when the refractions out of two mediums
+into a third are given, the refraction at the common surface of
+these mediums may be thus found. Let the refractions given
+<span class="pagenum" id="Page_28">28</span>be as <i>m</i>: <i>n</i>, and as <i>m</i>′: <i>n</i>′; then the ratio sought will be that of
+<i>m n</i>′: <i>m</i>′ <i>n</i>. For instance, let the three mediums be glass, water,
+and air; then <i>m</i> = 3, <i>n</i> = 2, <i>m</i>′ = 4, <i>n</i>′ = 3, <i>m n</i>′ = 9, and
+<i>m</i>′ <i>n</i> = 8. If the ratios be 4: 3, and 13: 14, we have <i>m&nbsp;n</i>′: <i>m</i>′ <i>n</i>
+:: 39: 56; and, dividing by 56—39, we obtain 2.3 and 3.3
+for <i>m</i> and <i>m</i> + 1, in Schol. 1, Prop. I.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> III. <i>Problem</i>. (Plate II. <a href="#Pl.II">Fig. 1</a>.)</p>
+
+<p>At the vertex of a given triangle (CBA), to place a given refracting
+surface (B), so that the incident and refracted rays may
+coincide with the sides of the triangle (AB and BC.)</p>
+
+<p>Let the sides be called <i>d</i> and <i>e</i>; then in the base take, next to
+<i>d</i> (or AB), a portion (AE) equal to <img style="vertical-align: -1.738ex; width: 9.336ex; height: 4.837ex;" src="images/1.svg" alt=" " data-tex="\(\dfrac{nd}{nd+me}\)">, or (AD =) <img style="vertical-align: -1.738ex; width: 9.336ex; height: 4.837ex;" src="images/2.svg" alt=" " data-tex="\(\dfrac{md}{md+ne}\)">;
+draw a line (EB, or DB) to the vertex, and the surface must be
+perpendicular to this line, whenever the problem is physically
+possible. When <img style="vertical-align: -0.025ex; width: 1.054ex; height: 1.025ex;" src="images/3.svg" alt=" " data-tex="\(e\)"> becomes infinite, and parallel to the base, take
+<img style="vertical-align: -1.577ex; width: 3.529ex; height: 4.676ex;" src="images/4.svg" alt=" " data-tex="\(\dfrac{nd}{m}\)"> or <img style="vertical-align: -1.577ex; width: 4.158ex; height: 4.676ex;" src="images/5.svg" alt=" " data-tex="\(\dfrac{md}{n}\)"> next to <img style="vertical-align: -0.023ex; width: 1.176ex; height: 1.593ex;" src="images/6.svg" alt=" " data-tex="\(d\)">, for the intersection of the radius of curvature.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> IV. <i>Theorem</i>. (<a href="#Pl.II">Fig. 2</a>.)</p>
+
+<p>In oblique refractions at spherical surfaces, the line (AI, KL,)
+joining the conjugate foci (A, I; K, L;) passes through the point
+(G), where a perpendicular from the centre (H) falls on the
+line (EF), bisecting the chords (BC, BD,) cut off from the incident
+and refracted rays.</p>
+
+<p>Corollary 1. Let <i>t</i> and <i>u</i> be the cosines of incidence and refraction,
+the radius being 1, and <i>d</i> and <i>e</i> the respective distances
+of the foci of incident and refracted rays; then <img style="vertical-align: -1.738ex; width: 21.397ex; height: 4.837ex;" src="images/7.svg" alt=" " data-tex="\(e=\dfrac{mduu}{mdu-ndt-ntt}\)"></p>
+
+<p><i>Corollary</i> 2. For a plane surface, <img style="vertical-align: -1.738ex; width: 10.818ex; height: 4.837ex;" src="images/8.svg" alt=" " data-tex="\(e=\dfrac{mduu}{-ntt}\)">.</p>
+
+<p><span class="pagenum" id="Page_29">29</span></p>
+
+<p><i>Corollary</i> 3. For parallel rays, <img style="vertical-align: -0.186ex; width: 6.456ex; height: 1.756ex;" src="images/9.svg" alt=" " data-tex="\(d=\infty\)">, and <img style="vertical-align: -1.738ex; width: 13.287ex; height: 4.267ex;" src="images/10.svg" alt=" " data-tex="\(e=\dfrac{muu}{mu-nt}\)">.</p>
+
+<p><i>Scholium</i> 1. It may be observed, that the caustic by refraction
+stops short at its cusp, not geometrically, but physically, the
+total reflection interfering.</p>
+
+<p><i>Corollary</i> 4. Call <img style="vertical-align: -1.738ex; width: 9.216ex; height: 4.267ex;" src="images/11.svg" alt=" " data-tex="\(\dfrac{muu}{mu-nt}\)">, <i>b</i> and <img style="vertical-align: -1.738ex; width: 9.216ex; height: 4.683ex;" src="images/12.svg" alt=" " data-tex="\(\dfrac{ntt}{mu-nt}\)">, <i>c</i>;
+then <img style="vertical-align: -1.738ex; width: 9.989ex; height: 4.837ex;" src="images/13.svg" alt=" " data-tex="\(e=\dfrac{bd}{d-c}\)">,
+and <img style="vertical-align: -1.738ex; width: 13.725ex; height: 4.837ex;" src="images/14.svg" alt=" " data-tex="\(e-b=\dfrac{bc}{d-c}\)">; or, in words, the rectangle contained by the
+focal lengths of parallel rays, passing and repassing any surface
+in the same lines, is equal to the rectangle contained by the
+differences between these lengths and the distances of any conjugate
+foci.</p>
+
+<p><i>Corollary</i> 5. For perpendicular rays, <img style="vertical-align: -1.738ex; width: 24.431ex; height: 4.837ex;" src="images/15.svg" alt=" " data-tex="\(e=\dfrac{md}{d-n}=m+\dfrac{mn}{d-n}\)">;
+or, if the radius be <img style="vertical-align: -1.738ex; width: 13.766ex; height: 4.837ex;" src="images/16.svg" alt=" " data-tex="\(a,e=\dfrac{mad}{d-na}\)">; and if <i>d</i> and <i>e</i> be given to find
+the radius, <img style="vertical-align: -1.738ex; width: 13.55ex; height: 4.837ex;" src="images/17.svg" alt=" " data-tex="\(a=\dfrac{de}{md+ne}\)">.</p>
+
+<p><i>Corollary</i> 6. For rays perpendicular and parallel, <i>e</i>&nbsp;=&nbsp;<i>m</i>, or
+<i>e</i>&nbsp;=&nbsp;<i>m&nbsp;a</i>.</p>
+
+<p><i>Corollary</i> 7. For a double convex lens, neglecting the thickness,
+call the first radius <i>g</i>, the second <i>h</i>, and <img style="vertical-align: -2.016ex; width: 19.073ex; height: 5.115ex;" src="images/18.svg" alt=" " data-tex="\(e=\dfrac{ndgh}{dg+dh-ngh}\)">.
+Hence <img style="vertical-align: -2.016ex; width: 18.145ex; height: 5.115ex;" src="images/19.svg" alt=" " data-tex="\(n=\dfrac{de}{d+e}\cdot \dfrac{g+h}{gh}\)">. and,
+for parallel rays, <img style="vertical-align: -2.016ex; width: 10.215ex; height: 5.115ex;" src="images/20.svg" alt=" " data-tex="\(e=\dfrac{ngh}{g+h}\)">, and
+<img style="vertical-align: -2.016ex; width: 13.207ex; height: 5.115ex;" src="images/21.svg" alt=" " data-tex="\(n=e\cdot \dfrac{g+h}{gh}\)">. If <img style="vertical-align: -1.738ex; width: 23.314ex; height: 4.837ex;" src="images/22.svg" alt=" " data-tex="\(g=h=a, e=\dfrac{nad}{2d-na}\)">; and for parallel rays <img style="vertical-align: -1.552ex; width: 7.621ex; height: 4.081ex;" src="images/23.svg" alt=" " data-tex="\(e=\dfrac{na}{2}\)">:
+calling this principal focal length <i>b</i>, <img style="vertical-align: -1.738ex; width: 9.98ex; height: 4.837ex;" src="images/24.svg" alt=" " data-tex="\(e=\dfrac{bd}{d-b}\)">, as in
+Cor. 4; whence we have the joint focus of two lenses; also,
+<img style="vertical-align: -1.738ex; width: 9.98ex; height: 4.837ex;" src="images/25.svg" alt=" " data-tex="\(b=\dfrac{de}{d+e}\)">.</p>
+
+<p><i>Corollary</i> 8. In a sphere, <img style="vertical-align: -2.172ex; width: 23.798ex; height: 5.271ex;" src="images/26.svg" alt=" " data-tex="\(e=ma\cdot \dfrac{d+a}{2d-(m-2)a}\)">, for the distance
+from the centre, and <img style="vertical-align: -1.552ex; width: 8.166ex; height: 4.081ex;" src="images/27.svg" alt=" " data-tex="\(b=\dfrac{ma}{2}\)">.</p>
+
+<p><span class="pagenum" id="Page_30">30</span></p>
+
+<p><i>Scholium</i> 2. In all these cases, if the rays converge, <i>d</i> must
+be negative. For instance, to find the joint focus of two convex,
+or concave lenses, the expression becomes, <img style="vertical-align: -1.738ex; width: 9.98ex; height: 4.837ex;" src="images/28.svg" alt=" " data-tex="\(e=\dfrac{bd}{b+d}\)">.</p>
+
+<p><i>Corollary</i> 9. In Cor. 3, the divisor becomes ultimately constant;
+and, when the inclination is smalls the focus varies as <i>u&nbsp;u</i>.</p>
+
+<p><i>Corollary</i> 10. For parallel rays falling obliquely on a double
+convex, or double concave lens, of inconsiderable thickness, the
+radius being 1, <img style="vertical-align: -2.172ex; width: 16.179ex; height: 5.118ex;" src="images/29.svg" alt=" " data-tex="\(e=\dfrac{ntu}{2(mu-nt)}\)">; which varies ultimately as the
+product of the cosines, or as <img style="vertical-align: -1.577ex; width: 12.492ex; height: 4.425ex;" src="images/30.svg" alt=" " data-tex="\(\dfrac{m+n}{nn}t+t^{2}\)">.</p>
+
+<p><i>Scholium</i> 3. In the double convex lens, the thickness diminishes
+the effect of the obliquity near the axis; in the double
+concave, it increases it.</p>
+
+<p><i>Scholium</i> 4. No spherical surface, excepting one particular
+case, (<span class="smcap">Wood</span>, 155,) can collect an oblique pencil of rays, even
+to a physical point. The oblique rays which we have hitherto
+considered, are only such as lie in that section of the pencil
+which is made by a plane passing through the centre and the
+radiant point. They continue in this plane, notwithstanding the
+refraction, and therefore will not meet the rays of the collateral
+sections, till they arrive at the axis. The remark was made by
+Sir <span class="smcap">Isaac Newton</span>, and extended by Dr. <span class="smcap">Smith</span>, (<span class="smcap">Smith</span> r.
+493, 494:) it appears, however, to have been too little noticed.
+(<span class="smcap">Wood</span>, 362.) The geometrical focus thus becomes a line, a
+circle, an oval, or other figure, according to the form of the
+pencil, the nature of the surface, and the place of the plane receiving
+the image. Some of the varieties of the focal image of
+a cylindrical pencil obliquely refracted are shown in Plate VI.
+<a href="#Pl.VI">Fig. 28</a>.</p>
+
+<p><span class="pagenum" id="Page_31">31</span></p>
+
+<p><i>Corollary</i> 11. Hence the line joining the remoter conjugate
+foci, will always pass through the centre. The distance
+of the remoter focus of parallel rays will be expressed by
+<img style="vertical-align: -1.738ex; width: 13.477ex; height: 4.267ex;" src="images/31.svg" alt=" " data-tex="\(f=\dfrac{m}{mu-nt}\)">; and the least circle of aberration will be at the
+distance <img style="vertical-align: -2.172ex; width: 20.856ex; height: 5.606ex;" src="images/32.svg" alt=" " data-tex="\(\dfrac{1+u^{2}-2u^{4}}{(1+uu)\cdot (mu-nt)}\)"> dividing the length of aberration in
+the ratio of the distance of its limits from the surface. In the
+case of Cor. 10. <img style="vertical-align: -2.172ex; width: 16.369ex; height: 4.701ex;" src="images/33.svg" alt=" " data-tex="\(f=\dfrac{n}{2(mu-nt)}\)">.</p>
+
+<p>Corollary 12. This proposition extends also to reflected rays;
+and, in that case, the line from the centre passes through the
+point of incidence.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> V. <i>Problem</i>.</p>
+
+<p>To find the place and magnitude of the image of a small
+object, after refraction at any number of spherical surfaces.</p>
+
+<p><i>Construction</i>. (Plate II. <a href="#Pl.II">Fig. 3</a>.) From any point (B) in the
+object (AB), draw lines to (C), the centre of the first surface,
+and to (D), the focus of parallel rays coming in a contrary
+direction: from the intersection of the second line (BD) with
+the tangent (EF) at the vertex, draw a line (EH) parallel to
+the axis, and it will cut the first line (BC) in (H), the first
+image of the point (B). Proceed with this image as a new object,
+and repeat the operation for each surface, and the last point
+will be in the image required. For calculation, find the place
+of the image by Cor. 5. Prop. IV. and its magnitude will be to
+that of the object, as their respective distances from the centre.</p>
+
+<p><i>Corollary</i>. If a confused image be received on any given
+plane, its magnitude will be determined by the line drawn from
+the preceding image through the centre of the last surface.</p>
+
+<p><span class="pagenum" id="Page_32">32</span></p>
+
+<p class="tac mtb1em"><i>Proposition</i> VI. <i>Problem</i>.</p>
+
+<p>To determine the law by which the refraction at a spherical
+surface must vary, so as to collect parallel rays to a perfect
+focus.</p>
+
+<p><i>Solution</i>. Let <i>v</i> be the versed sine to the radius 1; then, at
+each point without the axis, <i>n</i> remaining the same, <i>m</i> must
+become <img style="vertical-align: -0.238ex; width: 12.254ex; height: 2.398ex;" src="images/34.svg" alt=" " data-tex="\(\sqrt{mm±2nv}\)">; and all the rays will be collected in
+the principal focus.</p>
+
+<p><i>Corollary</i>. The same law will serve for a double convex lens,
+in the case of equidistant conjugate foci, substituting <i>n</i> for <i>m</i>.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> VII. <i>Problem</i>.</p>
+
+<p>To find the principal focus of a sphere, or lens, of which the
+internal parts are more dense than the external.</p>
+
+<p><i>Solution</i>. In order that the focal distance may be finite, the
+density of a finite portion about the centre must be equable:
+call the radius of this portion <img style="vertical-align: -1.577ex; width: 2.127ex; height: 4.613ex;" src="images/35.svg" alt=" " data-tex="\(\dfrac{1}{l}\)">, that of the sphere being unity;
+let the whole refraction out of the surrounding medium into this
+central part, be as <i>m</i> to <i>n</i>; take <img style="vertical-align: -2.018ex; width: 17.679ex; height: 5.118ex;" src="images/36.svg" alt=" " data-tex="\(r=\dfrac{\log l}{\log m- \log n}\)">, and let the density
+be supposed to vary every where inversely as the power <img style="vertical-align: -1.577ex; width: 2.127ex; height: 4.613ex;" src="images/37.svg" alt=" " data-tex="\(\dfrac{1}{r}\)">
+of the distance from the centre: then the principal focal distance
+from the centre will be <img style="vertical-align: -1.738ex; width: 15.327ex; height: 4.774ex;" src="images/38.svg" alt=" " data-tex="\(\dfrac{r-1}{2}\cdot \dfrac{m}{nl-m}\)">. When <i>r</i>&nbsp;=&nbsp;1, it becomes
+<img style="vertical-align: -2.172ex; width: 19.488ex; height: 5.208ex;" src="images/39.svg" alt=" " data-tex="\(\dfrac{1}{2(\text{H.L}.m-\text{H.L}.n)}\)">. For a lens, deduct one fourth of the difference
+between its axis and the diameter of the sphere of which its
+surfaces are portions.</p>
+
+<p><i>Corollary</i>. If the density be supposed to vary suddenly at the
+surface, <i>m</i> must express the difference of the refractions at the
+<span class="pagenum" id="Page_33">33</span>centre and at the surface; and the focal distance, thus determined,
+must be diminished according to the refraction at the surface.</p>
+
+<p class="tac mtb1em"><i>Proposition</i> VIII. <i>Problem</i>.</p>
+
+<p>To find the nearer focus of parallel rays falling obliquely on
+a sphere of variable density.</p>
+
+<p><i>Solution</i>. Let <i>r</i> be as in the last proposition, <i>s</i> the sine of incidence,
+<i>t</i> the cosine, and <i>e</i> the distance of the focus from the
+point of emersion. Then <img style="vertical-align: -1.738ex; width: 11.4ex; height: 4.683ex;" src="images/40.svg" alt=" " data-tex="\(e=\dfrac{w-t}{2-tw}\)">, <i>w</i> being <img style="vertical-align: -2.76ex; width: 14.415ex; height: 5.796ex;" src="images/41.svg" alt=" " data-tex="\(=\dfrac{2}{(r-1)s^{\frac{r+1}{r-1}\cdot }}\)">
+<img style="vertical-align: -0.566ex; width: 49.549ex; height: 2.47ex;" src="images/42.svg" alt=" " data-tex="\((a\text{A}+b\text{B}+c\text{C}+...)+2a\text{A}+6b\text{B}s^{2}+10c\text{C}s^{4}+...\)">
+where <img style="vertical-align: -1.738ex; width: 10.127ex; height: 4.267ex;" src="images/43.svg" alt=" " data-tex="\(a=\dfrac{r}{r+1}\)">, <img style="vertical-align: -1.738ex; width: 11.032ex; height: 4.267ex;" src="images/44.svg" alt=" " data-tex="\(b=\dfrac{r}{3r-1}\)">, <img style="vertical-align: -1.738ex; width: 11.041ex; height: 4.267ex;" src="images/45.svg" alt=" " data-tex="\(c=\dfrac{r}{5r-3}\)">, <img style="vertical-align: -0.816ex; width: 33.197ex; height: 2.773ex;" src="images/46.svg" alt=" " data-tex="\(\text{A}=1, \text{B}=\frac{1}{2}\text{A}, \text{C}=\frac{3}{4}\text{B}, \text{D}=\frac{5}{6}\text{C}\)">. But, when <i>s</i> is large, the latter part of the series converges
+somewhat slowly. The former part might be abridged
+if it were necessary: but, since the focus in this case is always
+very imperfect, it is of the less consequence to provide an easy
+calculation.</p>
+
+<p><i>General Scholium</i>. The two first propositions relate to well
+known phenomena; the third can hardly be new; the fourth
+approaches the nearest to <span class="smcap">Maclaurin</span>’s construction, but is far
+more simple and convenient; the fifth and sixth have no difficulty;
+but the two last require a long demonstration. The one
+is abridged by a property of logarithms; the other is derived from
+the laws of centripetal forces, on the supposition of velocities
+directly as the refractive densities, correcting the series for the
+place of the apsis, and making the sine of incidence variable,
+to determine the fluxion of the angle of deviation.</p>
+
+<p class="mt2em ti0">V. Dr. <span class="smcap">Porterfield</span> has employed an experiment, first
+made by <span class="smcap">Scheiner</span>, to the determination of the focal distance
+<span class="pagenum" id="Page_34">34</span>of the eye; and has described, under the name of an optometer,
+a very excellent instrument, founded on the principle of the
+phenomenon.‍&#x2060;<a id="FNanchor_7_7" href="#Footnote_7_7" class="fnanchor">7</a> But the apparatus is capable of considerable
+improvement; and I shall beg leave to describe an optometer,
+simple in its construction, and equally convenient and accurate
+in its application.</p>
+
+<p>Let an obstacle be interposed between a radiant point (R,
+Plate II. <a href="#Pl.II">Fig. 4</a>,) and any refracting surface, or lens (CD),
+and let this obstacle be perforated at two points (A and B) only.
+Let the refracted rays be intercepted by a plane, so as to form
+an image on it. Then it is evident, that when this plane (EF)
+passes through the focus of refracted rays, the image formed
+on it will be a single point. But, if the plane be advanced forwards
+(to GH), or removed backwards (to IK), the small
+pencils passing through the perforations, will no longer meet
+in a single point, but will fall on two distinct spots of the plane
+(G,&nbsp;H; I,&nbsp;K;) and, in either case, form a double image of the
+object.</p>
+
+<p>Let us now add two more radiating points, (S and T, <a href="#Pl.II">Fig. 5</a>,)
+the one nearer to the lens than the first point, the other more
+remote; and, when the plane which receives the images passes
+through the focus of rays coming from the first point, the images
+of the second and third points must both be double (<i>s&nbsp;s</i>, <i>t&nbsp;t</i>;)
+since the plane (EF) is without the focal distance of rays
+coming from the furthest point, and within that of rays coming
+from the nearest. Upon this principle. Dr. <span class="smcap">Porterfield</span>’s
+optometer was founded.</p>
+
+<p>But, if the three points be supposed to be joined by a line,
+and this line to be somewhat inclined to the axis of the lens,
+<span class="pagenum" id="Page_35">35</span>each point of the line, except the first point (R, <a href="#Pl.II">Fig. 6</a>,) will
+have a double image; and each pair of images, being contiguous
+to those of the neighbouring radiant points, will form with them
+two continued lines, and the images being more widely separated
+as the point which they represent is further from the first
+radiant point, the lines (<i>s&nbsp;t</i>, <i>s&nbsp;t</i>,) will converge on each side
+towards (<i>r</i>) the image of this point, and there will intersect
+each other.</p>
+
+<p>The same happens when we look at any object through two
+pin holes, within the limits of the pupil. If the object be at the
+point of perfect vision, the image on the retina will be single:
+but, in every other case, the image being double, we shall appear
+to see a double object: and, if we look at a line pointed nearly
+to the eye, it will appear as two lines, crossing each other in the
+point of perfect vision. For this purpose, the holes may be
+converted into slits, which render the images nearly as distinct,
+at the same time that they admit more light. The number may
+be increased from two to four, or more, whenever particular
+investigations render it necessary.</p>
+
+<p>The optometer may be made of a slip of card-paper, or of
+ivory, about eight inches in length, and one in breadth, divided
+longitudinally by a black line, which must not be too strong.
+The end of the card must be cut as is shown in Plate III. <a href="#Pl.III">Fig. 7</a>,
+in order that it may be turned up, and fixed in an inclined
+position by means of the shoulder: or a detached piece, nearly
+of this form, may be applied to the optometer, as it is here engraved.
+A hole about half an inch square must be made in this
+part; and the sides so cut as to receive a slider of thick paper,
+with slits of different sizes, from a fortieth to a tenth of an inch
+in breadth, divided by spaces somewhat broader; so that each
+observer may choose that which best suits the aperture of his pupil.
+<span class="pagenum" id="Page_36">36</span>In order to adapt the instrument to the use of presbyopic eyes,
+the other end must be furnished with a lens of four inches focal
+length; and a scale must be made near the line on each side
+of it, divided from one end into inches, and from the other according
+to the table here calculated from Cor. 7. Prop. IV, by
+means of which, not only diverging, but also parallel and converging
+rays from the lens are referred to their virtual focus.
+The instrument is easily applicable to the purpose of ascertaining
+the focal length of spectacles required for myopic or
+presbyopic eyes. Mr. <span class="smcap">Cary</span> has been so good as to furnish
+me with the numbers and focal lengths of the glasses commonly
+made; and I have calculated the distances at which those
+numbers must be placed on the scale of the optometer, so that
+a presbyopic eye may be enabled to see at eight inches distance,
+by using the glasses of the focal length placed opposite to the
+nearest crossing of the lines; and a myopic eye with parallel
+rays, by using the glasses indicated by the number that stands
+opposite their furthest crossing. To facilitate the observation,
+I have also placed these numbers opposite that point which
+will be the nearest crossing to myopic eyes; but this, upon the
+arbitrary supposition of an equal capability of change of focus
+in every eye, which I must confess is often far from the truth.
+It cannot be expected, that every person, on the first trial,
+will fix precisely upon that power which best suits the defect
+of his sight. Few can bring their eyes at pleasure to the state
+of full action, or of perfect relaxation; and a power two or
+three degrees lower than that which is thus ascertained, will be
+found sufficient for ordinary purposes. I have also added to the
+second table, such numbers as will point out the spectacles
+necessary for a presbyopic eye, to see at twelve and at eighteen
+inches respectively: the middle series will perhaps be the most
+<span class="pagenum" id="Page_37">37</span>proper for placing the numbers on the scale. The optometer
+should be applied to each eye; and, at the time of observing, the
+opposite eye should not be shut, but the instrument should be
+screened from its view. The place of intersection may be accurately
+ascertained, by means of an index sliding along the scale.
+The optometer is represented in Plate III. <a href="#Pl.III">Fig. 8 and 9</a>; and
+the manner in which the lines appear, in <a href="#Pl.III">Fig. 10.</a></p>
+
+<p class="tac pt1"><i>Table</i> I. <i>For extending the scale by a lens of 4 inches focus:</i></p>
+
+<div class="center">
+<table id="table1">
+<tr class="bt">
+<td>
+ 4
+</td>
+<td>
+2.00
+</td>
+<td>
+11
+</td>
+<td>
+2.93
+</td>
+<td>
+ 30
+</td>
+<td>
+3.52
+</td>
+<td>
+ 200
+</td>
+<td>
+3.92
+</td>
+<td>
+-35
+</td>
+<td>
+4.51
+</td>
+<td>
+-12 
+</td>
+<td>
+6.00
+</td>
+</tr>
+<tr>
+<td>
+ 5
+</td>
+<td>
+2.22
+</td>
+<td>
+12
+</td>
+<td>
+3.00
+</td>
+<td>
+ 40
+</td>
+<td>
+3.64
+</td>
+<td>
+∞
+</td>
+<td>
+4.00
+</td>
+<td>
+-30
+</td>
+<td>
+4.62
+</td>
+<td>
+-11 
+</td>
+<td>
+6.29
+</td>
+</tr>
+<tr>
+<td>
+ 6
+</td>
+<td>
+2.40
+</td>
+<td>
+13
+</td>
+<td>
+3.06
+</td>
+<td>
+ 50
+</td>
+<td>
+3.70
+</td>
+<td>
+-200
+</td>
+<td>
+4.08
+</td>
+<td>
+-25
+</td>
+<td>
+4.76
+</td>
+<td>
+-10 
+</td>
+<td>
+6.67
+</td>
+</tr>
+<tr>
+<td>
+ 7
+</td>
+<td>
+2.55
+</td>
+<td>
+14
+</td>
+<td>
+3.11
+</td>
+<td>
+ 60
+</td>
+<td>
+3.75
+</td>
+<td>
+-100
+</td>
+<td>
+4.17
+</td>
+<td>
+-20
+</td>
+<td>
+5.00
+</td>
+<td>
+-9.5
+</td>
+<td>
+6.90
+</td>
+</tr>
+<tr>
+<td>
+ 8
+</td>
+<td>
+2.67
+</td>
+<td>
+15
+</td>
+<td>
+3.16
+</td>
+<td>
+ 70
+</td>
+<td>
+3.78
+</td>
+<td>
+-50 
+</td>
+<td>
+4.35
+</td>
+<td>
+-15
+</td>
+<td>
+5.45
+</td>
+<td>
+-9.0
+</td>
+<td>
+7.20
+</td>
+</tr>
+<tr>
+<td>
+ 9
+</td>
+<td>
+2.77
+</td>
+<td>
+20
+</td>
+<td>
+3.33
+</td>
+<td>
+ 80
+</td>
+<td>
+3.81
+</td>
+<td>
+-45 
+</td>
+<td>
+4.39
+</td>
+<td>
+-14
+</td>
+<td>
+5.60
+</td>
+<td>
+-8.5
+</td>
+<td>
+7.56
+</td>
+</tr>
+<tr class="bb">
+<td>
+10
+</td>
+<td>
+2.86
+</td>
+<td>
+25
+</td>
+<td>
+3.45
+</td>
+<td>
+100
+</td>
+<td>
+3.85
+</td>
+<td>
+-40 
+</td>
+<td>
+4.44
+</td>
+<td>
+-13
+</td>
+<td>
+5.78
+</td>
+<td>
+-8.0
+</td>
+<td>
+8.00
+</td>
+</tr>
+</table>
+</div>
+
+<p class="tac pt1"><i>Table</i> II. <i>For placing the numbers indicating the focal length of
+convex glasses.</i></p>
+
+<div class="center">
+<table id="table2">
+<thead>
+<tr>
+<th>
+Foc.
+</th>
+<th>
+VIII.
+</th>
+<th>
+XII.
+</th>
+<th>
+XVIII.
+</th>
+<th>
+Foc.
+</th>
+<th>
+VIII.
+</th>
+<th>
+XII.
+</th>
+<th>
+XVIII.
+</th>
+<th>
+Foc.
+</th>
+<th>
+VIII.
+</th>
+<th>
+XII.
+</th>
+<th>
+XVIII.
+</th>
+</tr>
+</thead>
+<tr>
+<td>
+ 0
+</td>
+<td>
+ 8.00
+</td>
+<td>
+12.00
+</td>
+<td>
+18.00
+</td>
+<td>
+20
+</td>
+<td>
+13.33
+</td>
+<td>
+  30.00
+</td>
+<td>
+180.00
+</td>
+<td>
+8  
+</td>
+<td>
+∞
+</td>
+<td>
+-24.00
+</td>
+<td>
+-14.40
+</td>
+</tr>
+<tr>
+<td>
+40
+</td>
+<td>
+10.00
+</td>
+<td>
+17.14
+</td>
+<td>
+32.73
+</td>
+<td>
+18
+</td>
+<td>
+14.40
+</td>
+<td>
+  36.00
+</td>
+<td>
+∞
+</td>
+<td>
+7  
+</td>
+<td>
+-56.00
+</td>
+<td>
+-16.80
+</td>
+<td>
+-11.45
+</td>
+</tr>
+<tr>
+<td>
+36
+</td>
+<td>
+10.28
+</td>
+<td>
+18.00
+</td>
+<td>
+36.00
+</td>
+<td>
+16
+</td>
+<td>
+16.00
+</td>
+<td>
+  48.00
+</td>
+<td>
+-144.00
+</td>
+<td>
+6  
+</td>
+<td>
+-24.00
+</td>
+<td>
+-12.00
+</td>
+<td>
+- 9.00
+</td>
+</tr>
+<tr>
+<td>
+30
+</td>
+<td>
+10.91
+</td>
+<td>
+20.00
+</td>
+<td>
+45.00
+</td>
+<td>
+14
+</td>
+<td>
+18.67
+</td>
+<td>
+  84.00
+</td>
+<td>
+- 63.00
+</td>
+<td>
+5  
+</td>
+<td>
+-13.33
+</td>
+<td>
+- 8.57
+</td>
+<td>
+- 5.92
+</td>
+</tr>
+<tr>
+<td>
+28
+</td>
+<td>
+11.20
+</td>
+<td>
+21.00
+</td>
+<td>
+50.40
+</td>
+<td>
+12
+</td>
+<td>
+24.00
+</td>
+<td>
+∞
+</td>
+<td>
+- 36.00
+</td>
+<td>
+4.5
+</td>
+<td>
+-10.29
+</td>
+<td>
+- 7.20
+</td>
+<td>
+- 6.00
+</td>
+</tr>
+<tr>
+<td>
+26
+</td>
+<td>
+11.56
+</td>
+<td>
+22.29
+</td>
+<td>
+58.50
+</td>
+<td>
+11
+</td>
+<td>
+29.33
+</td>
+<td>
+-132.00
+</td>
+<td>
+- 28.29
+</td>
+<td>
+4.0
+</td>
+<td>
+- 8.00
+</td>
+<td>
+- 6.00
+</td>
+<td>
+- 5.14
+</td>
+</tr>
+<tr>
+<td>
+24
+</td>
+<td>
+12.00
+</td>
+<td>
+24.00
+</td>
+<td>
+72.00
+</td>
+<td>
+10
+</td>
+<td>
+40.00
+</td>
+<td>
+- 60.00
+</td>
+<td>
+- 22.50
+</td>
+<td>
+3.5
+</td>
+<td>
+- 6.22
+</td>
+<td>
+- 4.94
+</td>
+<td>
+- 4.34
+</td>
+</tr>
+<tr class="bb">
+<td>
+22
+</td>
+<td>
+12.77
+</td>
+<td>
+20.40
+</td>
+<td>
+99.00
+</td>
+<td>
+ 9
+</td>
+<td>
+72.00
+</td>
+<td>
+- 36.00
+</td>
+<td>
+- 18.00
+</td>
+<td>
+3.0
+</td>
+<td>
+- 4.80
+</td>
+<td>
+- 4.00
+</td>
+<td>
+- 3.6 
+</td>
+</tr>
+</table>
+</div>
+
+
+<p class="tac pt1"><i>Table</i> III. <i>For concave glasses.</i></p>
+
+<div class="center">
+<table id="table3">
+<thead>
+<tr>
+<th>
+Number.
+</th>
+<th>
+Focus and<br>furthest<br>place.
+</th>
+<th>
+Nearest<br>place.
+</th>
+<th>
+Number.
+</th>
+<th>
+Focus and<br>furthest<br>place.
+</th>
+<th>
+Nearest<br>place.
+</th>
+<th>
+Number.
+</th>
+<th>
+Focus and<br>furthest<br>place.
+</th>
+<th>
+Nearest<br>place.
+</th>
+</tr>
+</thead>
+<tr>
+<td>
+0
+</td>
+<td>
+
+</td>
+<td>
+4.00
+</td>
+<td>
+ 7
+</td>
+<td>
+8  
+</td>
+<td>
+2.67
+</td>
+<td>
+14
+</td>
+<td>
+3.00
+</td>
+<td>
+1.71
+</td>
+</tr>
+<tr>
+<td>
+1
+</td>
+<td>
+24
+</td>
+<td>
+3.43
+</td>
+<td>
+ 8
+</td>
+<td>
+7  
+</td>
+<td>
+2.54
+</td>
+<td>
+15
+</td>
+<td>
+2.75
+</td>
+<td>
+1.63
+</td>
+</tr>
+<tr>
+<td>
+2
+</td>
+<td>
+18
+</td>
+<td>
+3.27
+</td>
+<td>
+ 9
+</td>
+<td>
+6  
+</td>
+<td>
+2.40
+</td>
+<td>
+16
+</td>
+<td>
+2.50
+</td>
+<td>
+1.54
+</td>
+</tr>
+<tr>
+<td>
+3
+</td>
+<td>
+16
+</td>
+<td>
+3.20
+</td>
+<td>
+10
+</td>
+<td>
+5  
+</td>
+<td>
+2.22
+</td>
+<td>
+17
+</td>
+<td>
+2.25
+</td>
+<td>
+1.44
+</td>
+</tr>
+<tr>
+<td>
+4
+</td>
+<td>
+12
+</td>
+<td>
+3.00
+</td>
+<td>
+11
+</td>
+<td>
+4.5
+</td>
+<td>
+2.12
+</td>
+<td>
+18
+</td>
+<td>
+2.00
+</td>
+<td>
+1.33
+</td>
+</tr>
+<tr>
+<td>
+5
+</td>
+<td>
+10
+</td>
+<td>
+2.86
+</td>
+<td>
+12
+</td>
+<td>
+4.0
+</td>
+<td>
+2.00
+</td>
+<td>
+19
+</td>
+<td>
+1.75
+</td>
+<td>
+1.22
+</td>
+</tr>
+<tr class="bb">
+<td>
+6
+</td>
+<td>
+ 9
+</td>
+<td>
+2.77
+</td>
+<td>
+13
+</td>
+<td>
+3.5
+</td>
+<td>
+1.87
+</td>
+<td>
+20
+</td>
+<td>
+1.50
+</td>
+<td>
+1.02
+</td>
+</tr>
+</table>
+</div>
+
+
+<p><span class="pagenum" id="Page_38">38</span></p>
+<p class="mt2em ti0">VI. Being convinced of the advantage of making every
+observation with as little assistance as possible, I have endeavoured
+to confine most of my experiments to my own eyes;
+and I shall, in general, ground my calculations on the supposition
+of an eye nearly similar to my own. I shall therefore
+first endeavour to ascertain all its dimensions, and all its
+faculties.</p>
+
+<p>For measuring the diameters, I fix a small key on each point
+of a pair of compasses; and I can venture to bring the rings
+into immediate contact with the sclerotica. The transverse
+diameter is externally 98 hundredths of an inch.</p>
+
+<p>To find the axis, I turn the eye as much inwards as possible,
+and press one of the keys close to the sclerotica, at the external
+angle, till it arrives at the spot where the spectrum formed
+by its pressure coincides with the direction of the visual axis, and,
+looking in a glass, I bring the other key to the cornea. The
+optical axis of the eye, making allowance of three hundredths
+for the coats, is thus found to be 91 hundredths of an inch, from
+the external surface of the cornea to the retina. With an eye
+less prominent, this method might not have succeeded.</p>
+
+<p>The vertical diameter, or rather chord, of the cornea, is 45
+hundredths: its versed sine 11 hundredths. To ascertain the
+versed sine, I looked with the right eye at the image of the
+left, in a small speculum held close to the nose, while the left
+eye was so averted that the margin of the cornea appeared as a
+straight line, and compared the projection of the cornea with
+the image of a cancellated scale held in a proper direction behind
+the left eye, and close to the left temple. The horizontal
+chord of the cornea is nearly 49 hundredths.</p>
+
+<p>Hence the radius of the cornea is 31 hundredths. It may
+<span class="pagenum" id="Page_39">39</span>be thought that I assign too great a convexity to the cornea;
+but I have corrected it by a number of concurrent observations,
+which will be enumerated hereafter.</p>
+
+<p>The eye being directed towards its image, the projection of
+the margin of the sclerotica is 22 hundredths from the margin
+of the cornea, towards the external angle, and 27 towards the
+internal angle of the eye: so that the cornea has an eccentricity
+of one fortieth of an inch, with respect to the section of
+the eye perpendicular to the visual axis.</p>
+
+<p>The aperture of the pupil varies from 27 to 13 hundredths;
+at least this is its apparent size, which must be somewhat diminished,
+on account of the magnifying power of the cornea,
+perhaps to 25 and 12. When dilated, it is nearly as eccentric
+as the cornea; but, when most contracted, its centre coincides
+with the reflection of an image from an object held immediately
+before the eye; and this image very nearly with the centre of
+the whole apparent margin of the sclerotica: so that the cornea
+is perpendicularly intersected by the visual axis.</p>
+
+<p>My eye, in a state of relaxation, collects to a focus on the
+retina, those rays which diverge vertically from an object at the
+distance of ten inches from the cornea, and the rays which
+diverge horizontally from an object at seven inches distance.
+For, if I hold the plane of the optometer vertically, the images
+of the line appear to cross at ten inches; if horizontally, at seven.
+The difference is expressed by a focal length of 23 inches. I
+have never experienced any inconvenience from this imperfection,
+nor did I ever discover it till I made these experiments;
+and I believe I can examine minute objects with as much accuracy
+as most of those whose eyes are differently formed. On
+mentioning it to Mr. <span class="smcap">Cary</span>, he informed me, that he had
+<span class="pagenum" id="Page_40">40</span>frequently taken notice of a similar circumstance; that many
+persons were obliged to hold a concave glass obliquely, in order
+to see with distinctness, counterbalancing, by the inclination of
+the glass, the too great refractive power of the eye in the direction
+of that inclination, (Cor. 10. Prop. IV.) and finding but
+little assistance from spectacles of the same focal length. The
+difference is not in the cornea, for it exists when the effect of
+the cornea is removed by a method to be described hereafter.
+The cause is, without doubt, the obliquity of the uvea, and of
+the crystalline lens, which is nearly parallel to it, with respect
+to the visual axis: this obliquity will appear, from the dimensions
+already given, to be about 10 degrees. Without entering
+into a very accurate calculation, the difference observed is found
+(by the same corollary) to require an inclination of about 13
+degrees; and the remaining three degrees may easily be added,
+by the greater obliquity of the posterior surface of the crystalline
+opposite the pupil. There would be no difficulty in fixing the
+glasses of spectacles, or the concave eye-glass of a telescope, in
+such a position as to remedy the defect.</p>
+
+<p>In order to ascertain the focal distance of the lens, we must
+assign its probable distance from the cornea. Now the versed
+sine of the cornea being 11 hundredths, and the uvea being
+nearly flat, the anterior surface of the lens must probably be
+somewhat behind the chord of the cornea; but by a very inconsiderable
+distance, for the uvea has the substance of a thin membrane,
+and the lens approaches very near to it: we will therefore
+call this distance 12 hundredths. The axis and proportions
+of the lens must be estimated by comparison with anatomical
+observations; since they affect, in a small degree, the determination
+of its focal distance. M. <span class="smcap">Petit</span> found the axis
+<span class="pagenum" id="Page_41">41</span>almost always about two lines, or 18 hundredths of an inch.
+The radius of the anterior surface was in the greatest number
+3 lines, but oftener more than less. We will suppose mine
+to be <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/47.svg" alt=" " data-tex="\(3\frac{1}{4}\)">, or nearly <img style="vertical-align: -0.816ex; width: 2.595ex; height: 2.773ex;" src="images/48.svg" alt=" " data-tex="\(\frac{1}{10}\)"> of an inch. The radius of the
+posterior surface was most frequently <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/49.svg" alt=" " data-tex="\(2\frac{1}{2}\)"> lines, or <img style="vertical-align: -0.816ex; width: 1.795ex; height: 2.773ex;" src="images/50.svg" alt=" " data-tex="\(\frac{2}{9}\)"> of an
+inch.‍&#x2060;<a id="FNanchor_8_8" href="#Footnote_8_8" class="fnanchor">8</a> The
+optical centre will be therefore <img style="vertical-align: -0.912ex; width: 9.901ex; height: 2.869ex;" src="images/51.svg" alt=" " data-tex="\(\left( \frac{18\times 30}{30+22}= \right)\)"> about
+one-tenth of an inch from the anterior surface: hence we have
+22 hundredths, for the distance of the centre from the cornea.
+Now, taking 10 inches as the distance of the radiant point, the
+focus of the cornea will be 115 hundredths behind the centre
+of the lens. (Cor. 5. Prop. IV.) But the actual joint focus is
+(91&nbsp;—&nbsp;22&nbsp;=) 69 behind the centre: hence, disregarding the
+thickness of the lens, its principal focal distance is 173 hundredths.
+(Cor. 7. Prop. IV.) For its refractive power in the
+eye, we have (by Cor. 7. Prop. IV.) <i>n</i>&nbsp;=&nbsp;13.5, and <i>m</i>&nbsp;=&nbsp;14.5.
+Calculating upon this refractive power, with the consideration
+of the thickness also, we find that it requires a correction,
+and comes near to the ratio of 14 to 13 for the sines. It
+is well known that the refractive powers of the humours are
+equal to that of water; and, that the thickness of the cornea is
+too equable to produce any effect on the focal distance.</p>
+
+<p>For determining the refractive power of the crystalline lens
+by a direct experiment, I made use of a method suggested to
+me by Dr. <span class="smcap">Wollaston</span>. I found the refractive power of the
+centre of the recent human crystalline to that of water, as 21
+to 20. The difference of this ratio from the ratio of 14 to 13,
+ascertained from calculation, is probably owing to two circumstances.
+The first is, that the substance of the lens being in
+some degree soluble in water, a portion of the aqueous fluid
+<span class="pagenum" id="Page_42">42</span>within its capsule penetrates after death, so as somewhat to
+lessen the density. When dry, the refractive power is little inferior
+to that of crown glass. The second circumstance is, the
+unequal density of the lens. The ratio of 14 to 13 is founded
+on the supposition of an equable density: but, the central part
+being the most dense, the whole acts as a lens of smaller dimensions;
+and it may be found by Prop. VII. that if the central
+portion of a sphere be supposed of uniform density, refracting
+as 21 to 20, to the distance of one half of the radius, and
+the density of the external parts to decrease gradually, and at
+the surface to become equal to that of the surrounding medium,
+the sphere thus constituted, will be equal in focal length to a
+uniform sphere of the same size, with a refraction of 16 to 15
+nearly. And the effect will be nearly the same, if the central
+portion be supposed to be smaller than this, but the density
+to be somewhat greater at the surface than that of the surrounding
+medium, or to vary more rapidly externally than internally.
+On the whole, it is probable that the refractive
+power of the centre of the human crystalline, in its living state,
+is to that of water nearly as 18 to 17; that the water imbibed
+after death, reduces it to the ratio of 21 to 20; but that, on
+account of the unequable density of the lens, its effect in the
+eye is equivalent to a refraction of 14 to 13 for its whole size.
+Dr. <span class="smcap">Wollaston</span> has ascertained the refraction out of air, into
+the centre of the recent crystalline of oxen and sheep, to be
+nearly as 143 to 100; into the centre of the crystalline of fish,
+and into the dried crystalline of sheep, as 152 to 100. Hence,
+the refraction of the crystalline of oxen in water, should be
+as 15 to 14: but the human crystalline, when recent, is decidedly
+less refractive.</p>
+
+<p><span class="pagenum" id="Page_43">43</span></p>
+
+<p>These considerations will explain the inconsistency of different
+observations on the refractive power of the crystalline;
+and, in particular, how the refraction which I formerly calculated,
+from measuring the focal length of the lens,‍&#x2060;<a id="FNanchor_9_9" href="#Footnote_9_9" class="fnanchor">9</a> is so much
+greater than that which is determined by other means. But,
+for direct experiments, Dr. <span class="smcap">Wollaston</span>’s method is exceedingly
+accurate.</p>
+
+<p>When I look at a minute lucid point, such as the image of
+a candle in a small concave speculum, it appears as a radiated
+star, as a cross, or as an unequal line, and never as a perfect
+point, unless I apply a concave lens inclined at a proper angle,
+to correct the unequal refraction of my eye. If I bring the
+point very near, it spreads into a surface nearly circular, and
+almost equably illuminated, except some faint lines, nearly in a
+radiating direction. For this purpose, the best image is a candle,
+or a small speculum, viewed through a minute lens at some
+little distance, or seen by reflection in a larger lens. If any
+pressure has been applied to the eye, such as that of the finger
+keeping it shut, the sight is often confused for a short time after
+the removal of the finger, and the image is in this case spotty
+or curdled. The radiating lines are probably occasioned by
+some slight inequalities in the surface of the lens, which is very
+superficially furrowed in the direction of its fibres: the curdled
+appearance will be explained hereafter. When the point is further
+removed, the image becomes evidently oval, the vertical
+diameter being longest, and the lines a little more distinct than
+before, the light being strongest in the neighbourhood of the
+centre; but immediately at the centre there is a darker spot,
+owing to such a slight depression at the vertex as is often
+<span class="pagenum" id="Page_44">44</span>observable in examining the lens after death. The situation of
+the rays is constant, though not regular; the most conspicuous
+are seven or eight in number; sometimes about twenty fainter
+ones may be counted. Removing the point a little further, the
+image becomes a short vertical line; the rays that diverged horizontally
+being perfectly collected, while the vertical rays are
+still separate. In the next stage, which is the most perfect
+focus, the line spreads in the middle, and approaches nearly to
+a square, with projecting angles, but is marked with some
+darker lines towards the diagonals. The square then flattens
+into a rhombus, and the rhombus into a horizontal line unequally
+bright. At every greater distance, the line lengthens,
+and acquires also breadth, by radiations shooting out from it, but
+does not become a uniform surface, the central part remaining
+always considerably brightest, in consequence of the same flattening
+of the vertex which before made it fainter. Some of
+these figures bear a considerable analogy to the images derived
+from the refraction of oblique rays, (Schol. 4. Prop. IV.) and
+still more strongly resemble a combination of two of them in
+opposite directions; so as to leave no doubt, but that both surfaces
+of the lens are oblique to the visual axis, and co-operate
+in distorting the focal point. This may also be verified, by
+observing the image delineated by a common glass lens, when
+inclined to the incident rays. (See Plate VI. <a href="#Pl.IV">Fig. 28—40</a>.)</p>
+
+<p>The visual axis being fixed in any direction, I can at the
+same time see a luminous object placed laterally at a considerable
+distance from it; but in various directions the angle
+is very different. Upwards it extends to 50 degrees, inwards
+to 60, downwards to 70, and outwards to 90 degrees. These
+internal limits of the field of view nearly correspond with
+<span class="pagenum" id="Page_45">45</span>the external limits formed by the different parts of the face,
+when the eye is directed forwards and somewhat downwards,
+which is its most natural position; although the internal limits
+are a little more extensive than the external; and both are well
+calculated for enabling us to perceive the most readily, such
+objects as are the most likely to concern us. Dr. <span class="smcap">Wollaston</span>’s
+eye has a larger field of view, both vertically and horizontally,
+but nearly in the same proportions, except that it extends further
+upwards. It is well known, that the retina advances further
+forwards towards the internal angle of the eye, than towards
+the external angle; but upwards and downwards its extent is
+nearly equal, and is indeed every way greater than the limits of
+the field of view, even if allowance is made for the refraction
+of the cornea only. The sensible portion seems to coincide
+more nearly with the painted choroid of quadrupeds: but the
+whole extent of perfect vision is little more than 10 degrees; or,
+more strictly speaking, the imperfection begins within a degree
+or two of the visual axis, and at the distance of 5 or 6 degrees
+becomes nearly stationary, until, at a still greater distance, vision
+is wholly extinguished. The imperfection is partly owing to
+the unavoidable aberration of oblique rays, but principally to
+the insensibility of the retina: for, if the image of the sun
+itself be received on a part of the retina remote from the axis,
+the impression will not be sufficiently strong to form a permanent
+spectrum, although an object of very moderate brightness
+will produce this effect when directly viewed. It would probably
+have been inconsistent with the economy of nature, to bestow a
+larger share of sensibility on the retina. The optic nerve is at
+present very large; and the delicacy of the organ renders it,
+even at present, very susceptible of injury from slight irritation.
+<span class="pagenum" id="Page_46">46</span>and very liable to inflammatory affections; and, in order to
+make the sight so perfect as it is, it was necessary to confine that
+perfection within narrow limits. The motion of the eye has a
+range of about 55 degrees in every direction; so that the field
+of perfect vision, in succession, is by this motion extended to
+110 degrees.</p>
+
+<p>But the whole of the retina is of such a form as to receive
+the most perfect image, on every part of its surface, that the
+state of each refracted pencil will admit; and the varying density
+of the crystalline renders that state more capable of delineating
+such a picture, than any other imaginable contrivance could
+have done. To illustrate this, I have constructed a diagram,
+representing the successive images of a distant object filling the
+whole extent of view, as they would be formed by the successive
+refractions of the different surfaces. Taking the scale of
+my own eye, I am obliged to substitute, for a series of objects
+at any indefinitely great distance, a circle of 10 inches radius;
+and it is most convenient to consider only those rays which pass
+through the anterior vertex of the lens; since the actual centre
+of each pencil must be in the ray which passes through the
+centre of the pupil, and the short distance of the vertex of the
+lens from this point, will always tend to correct the unequal
+refraction of oblique rays. The first curve (Plate IV. <a href="#Pl.IV">Fig. 16</a>.)
+is the image formed by the furthest intersection of rays refracted
+at the cornea; the second, the image formed by the nearest intersection;
+the distance between these, shows the degree of confusion
+in the image; and the third curve, its brightest part. Such
+must be the form of the image which the cornea tends to delineate
+in an eye deprived of the crystalline lens; nor can any
+external remedy properly correct the imperfection of lateral
+<span class="pagenum" id="Page_47">47</span>vision. The next three curves show the images formed after
+the refraction at the anterior surface of the lens, distinguished in
+the same manner; and the three following, the result of all the
+successive refractions. The tenth curve is a repetition of the
+ninth, with a slight correction near the axis, at F, where, from
+the breadth of the pupil, some perpendicular rays must fall. By
+comparing this with the eleventh, which is the form of the retina,
+it will appear that nothing more is wanting for their perfect
+coincidence, than a moderate diminution of density in the lateral
+parts of the lens. If the law, by which this density varies, were
+more accurately ascertained, its effect on the image might be
+calculated from the eighth proposition; but the operations would
+be somewhat laborious: probably the image, thus corrected,
+would approach very nearly to the form of the twelfth curve.</p>
+
+<p>To find the place of the entrance of the optic nerve, I fix
+two candles at ten inches distance, retire sixteen feet, and direct
+my eye to a point four feet to the right or left of the middle of
+the space between them: they are then lost in a confused spot
+of light; but any inclination of the eye brings one or the other
+of them into the field of view. In <span class="smcap">Bernoulli</span>’s eye, a greater
+deviation was required for the direction of the axis;‍&#x2060;<a id="FNanchor_10_10" href="#Footnote_10_10" class="fnanchor">10</a> and the
+obscured part appeared to be of greater extent. From the
+experiment here related, the distance of the centre of the optic
+nerve from the visual axis is found (by Prop. V.) to be 16 hundredths
+of an inch; and the diameter of the most insensible part
+of the retina, one-thirtieth of an inch. In order to ascertain the
+distance of the optic nerve from the point opposite to the pupil,
+I took the sclerotica of the human eye, divided it into segments,
+from the centre of the cornea towards the optic nerve, and extended
+it on a plane. I then measured the longest and shortest
+<span class="pagenum" id="Page_48">48</span>distances from the cornea to the perforation made by the nerve,
+and their difference was exactly one-fifth of an inch. To this
+we must add a fiftieth, on account of the eccentricity of the
+pupil in the uvea, which in the eye that I measured was not
+great, and the distance of the centre of the nerve from the
+point opposite the pupil will be 11 hundredths. Hence it appears,
+that the visual axis is five hundredths, or one-twentieth of
+an inch, further from the optic nerve than the point opposite the
+pupil. It is possible that this distance may be different in different
+eyes: in mine, the obliquity of the lens, and the eccentricity
+of the pupil with respect to it, will tend to throw a direct
+ray upon it, without much inclination of the whole eye; and it
+is not improbable, that the eye is also turned slightly outwards,
+if looking at any object before it, although the inclination is
+too small to be subjected to measurement.</p>
+
+<p>It must also be observed, that it is very difficult to ascertain
+the proportions of the eye so exactly as to determine, with certainty,
+the size of an image on the retina; the situation, curvature,
+and constitution of the lens, make so material a difference
+in the result, that there may possibly be an error of almost one-
+tenth of the whole. In order, therefore, to obtain some confirmation
+from experiment, I placed two candles at a small distance
+from each other, turned the eye inwards, and applied the
+ring of a key so as to produce a spectrum, of which the edge
+coincided with the inner candle; then, fixing my eye on the outward
+one, I found that the spectrum advanced over two-sevenths
+of the distance between them. Hence, the same portion of the
+retina that subtended an angle of seven parts at the centre of
+motion of the eye, subtended an angle of five at the supposed
+intersection of the principal rays; (Plate III. <a href="#Pl.III">Fig. 11</a>.) and the
+<span class="pagenum" id="Page_49">49</span>distance of this intersection from the retina was 637 thousandths.
+This nearly corresponds with the former calculation; nor can
+the distance of the centre of the optic nerve from the point of
+most perfect vision be, on any supposition, much less than that
+which is here assigned. And, in the eyes of quadrupeds, the
+most strongly painted part of the choroid is further from the
+nerve than the real axis of the eye.</p>
+
+<p>I have endeavoured to express in four figures, the form of
+every part of my eye, as nearly as I have been able to ascertain
+it; the first (Pl. V. <a href="#Pl.V">Fig. 17</a>.) is a vertical section; the second
+(Fig. 18.) a horizontal section; the third and fourth are front
+views, in different states of the pupil. (<a href="#Pl.V">Fig. 19 and 20</a>.)</p>
+
+<p>Considering how little inconvenience is experienced from so
+material an inequality in the refraction of the lens as I have
+described, we have no reason to expect a very accurate provision
+for correcting the aberration of the lateral rays. But, as far as
+can be ascertained by the optometer, the aberration arising from
+figure is completely corrected; since four or more images of the
+same line appear to meet exactly in the same point, which they
+would not do if the lateral rays were materially more refracted
+than the rays near the axis. The figure of the surfaces is sometimes,
+and perhaps always, more or less hyperbolical‍&#x2060;<a id="FNanchor_11_11" href="#Footnote_11_11" class="fnanchor">11</a> or elliptical:
+in the interior laminæ indeed, the solid angle of the
+margin is somewhat rounded off; but the weaker refractive
+power of the external parts, must greatly tend to correct the
+aberration arising from the too great curvature towards the
+margin of the disc. Had the refractive power been uniform, it
+might have collected the lateral rays of a direct pencil nearly as
+well; but it would have been less adapted to oblique pencils of
+<span class="pagenum" id="Page_50">50</span>rays; and the eye must also have been encumbered with a mass
+of much greater density than is now required, even for the
+central parts: and, if the whole lens had been smaller, it would
+also have admitted too little light. It is possible too, that Mr.
+<span class="smcap">Ramsden</span>’s observation,‍&#x2060;<a id="FNanchor_12_12" href="#Footnote_12_12" class="fnanchor">12</a> on the advantage of having no reflecting
+surface, may be well-founded: but it has not been demonstrated,
+that less light is lost in passing through a medium
+of variable density, than in a sudden transition from one part of
+that medium to another; nor are we yet sufficiently acquainted
+with the cause of this reflection, to be enabled to reason satisfactorily
+on the subject. But, neither this gradation, nor any other
+provision, has the effect of rendering the eye perfectly achromatic.
+Dr. <span class="smcap">Jurin</span> had remarked this, long ago,‍&#x2060;<a id="FNanchor_13_13" href="#Footnote_13_13" class="fnanchor">13</a> from observing
+the colour bordering the image of an object seen indistinctly.
+Dr. <span class="smcap">Wollaston</span> pointed out to me on the optometer, the red
+and blue appearance of the opposite internal angles of the crossing
+lines; and mentioned, at the same time, a very elegant experiment
+for proving the dispersive power of the eye. He looks
+through a prism at a small lucid point, which of course becomes
+a linear spectrum. But the eye cannot so adapt itself as to make
+the whole spectrum appear a line; for, if the focus be adapted
+to collect the red rays to a point, the blue will be too much refracted,
+and expand into a surface; and the reverse will happen
+if the eye be adapted to the blue rays; so that, in either case, the
+line will be seen as a triangular space. The observation is confirmed,
+by placing a small concave speculum in different parts
+of a prismatic spectrum, and ascertaining the utmost distances
+at which the eye can collect the rays of different colours to a
+focus. By these means I find, that the red rays, from a point at
+<span class="pagenum" id="Page_51">51</span>12 inches distance, are as much refracted as white or yellow
+light at 11. The difference is equal to the refraction of a lens
+132 inches in focus. But the aberration of the red rays in a
+lens of crown glass, of equal mean refractive power with the
+eye, would be equivalent to the effect of a lens 44 inches in
+focus. If, therefore, we can depend upon this calculation, the
+dispersive power of the eye collectively, is one-third of the dispersive
+power of crown glass, at an equal angle of deviation. 1
+cannot observe much aberration in the violet rays. This may
+be, in part, owing to their faintness; but yet I think their aberration
+must be less than that of the red rays. I believe it was
+Mr. <span class="smcap">Ramsden</span>’s opinion, that since the separation of coloured
+rays is only observed where there is a sudden change of density,
+such a body as the lens, of a density gradually varying, would
+have no effect whatever in separating the rays of different colours.
+If this hypothesis should appear to be well-founded, we must
+attribute the whole dispersion to the aqueous humour; and its
+dispersive power will be half that of crown glass, at the same
+deviation. But we have an instance, in the atmosphere, of a
+very gradual change of density; and yet Mr. <span class="smcap">Gilpin</span> informs
+me, that the stars, when near the horizon, appear very evidently
+coloured. At a more favourable season of the year, it would
+not be difficult to ascertain, by means of the optometer, the
+dispersive power of the eye, and of its different parts, with greater
+accuracy than by the experiment here related. Had the dispersive
+power of the whole eye been equal to that of flint glass,
+the distances of perfect vision would have varied from 12 inches
+to 7 for different rays, in the same state of the mean refractive
+powers.</p>
+
+
+<p class="mt2em ti0">VII. The faculty of accommodating the eye to various
+<span class="pagenum" id="Page_52">52</span>distances, appears to exist in very different degrees in different
+individuals. The shortest distance of perfect vision in my eye,
+is 26 tenths of an inch for horizontal, and 29 for vertical rays.
+This power is equivalent to the addition of a lens of 4 inches
+focus. Dr. <span class="smcap">Wollaston</span> can see at 7 inches, and with converging
+rays; the difference answering to 6 inches focal length. Mr.
+<span class="smcap">Abernethy</span> has perfect vision from 3 inches to 30, or a power
+equal to that of a lens 3-1/3 inches in focus. A young lady of my
+acquaintance can see at 2 inches and at 4; the difference being
+equivalent to 4 inches focus. A middle aged lady at 3 and at 4;
+the power of accommodation being only equal to the effect of a
+lens of 12 inches focus. In general, I have reason to think, that
+the faculty diminishes in some degree, as persons advance in life;
+but some also of a middle age appear to possess it in a very small
+degree. I shall take the range of my own eye, as being probably
+about the medium, and inquire what changes will be necessary
+in order to produce it; whether we suppose the radius of the
+cornea to be diminished, or the distance of the lens from the
+retina to be increased, or these two causes to act conjointly, or
+the figure of the lens itself to undergo an alteration.</p>
+
+<p>1. We have calculated, that when the eye is in a state of
+relaxation, the refraction of the cornea is such as to collect
+rays diverging from a point ten inches distant, to a focus at
+the distance of 13-2/3 tenths. In order that it may bring to the
+same focus, rays diverging from a point distant 29 tenths, we
+find (by Cor. 5, Prop. IV.) that its radius must be diminished
+from 31 to 25 hundredths, or very nearly in the ratio of five
+to four.</p>
+
+<p>2. Supposing the change from perfect vision at ten inches to
+29 tenths, to be effected by a removal of the retina to a greater
+<span class="pagenum" id="Page_53">53</span>distance from the lens, this will require, (by the same Corollary,)
+an elongation of 135 thousandths, or more than one-seventh
+of the diameter of the eye. In Mr. <span class="smcap">Abernethy</span>’s eye, an
+elongation of 17 hundredths, or more than one-sixth, is requisite.</p>
+
+<p>3. If the radius of the cornea be diminished one-sixteenth,
+or to 29 hundredths, the eye must at the same time be elongated
+97 thousandths, or about one-ninth of its diameter.</p>
+
+<p>4. Supposing the crystalline lens to change its form; if it
+became a sphere, its diameter would be 28 hundredths, and, its
+anterior surface retaining its situation, the eye would have perfect
+vision at the distance of an inch and a half. (Cor. 5 and
+8, Prop. IV.) This is more than double the actual change.
+But it is impossible to determine precisely how great an alteration
+of form is necessary, without ascertaining the nature of the
+curves into which its surfaces may be changed. If it were
+always a spheroid more or less oblate, the focal length of each
+surface would vary inversely as the square of the axis: but, if
+the surfaces became, from spherical, portions of hyperbolic
+conoids, or of oblong spheroids, or changed from more obtuse
+to more acute figures of this kind, the focal length would vary
+more rapidly. Disregarding the elongation of the axis, and
+supposing the curvature of each surface to be changed proportionally,
+the radius of the anterior must become about 24, and
+that of the posterior 17 hundredths.</p>
+
+
+<p class="mt2em ti0">VIII. I shall now proceed to inquire, which of these changes
+takes place in nature; and I shall begin with a relation of experiments
+made in order to ascertain the curvature of the cornea
+in all circumstances.</p>
+
+<p>The method described in Mr. <span class="smcap">Home</span>’s Croonian Lecture for
+<span class="pagenum" id="Page_54">54</span>1795,‍&#x2060;<a id="FNanchor_14_14" href="#Footnote_14_14" class="fnanchor">14</a> appears to be far preferable to the apparatus of the
+preceding year:‍&#x2060;<a id="FNanchor_15_15" href="#Footnote_15_15" class="fnanchor">15</a> for a difference in the distance of two images
+seen in the cornea, would be far greater, and more conspicuous,
+than a change of its prominency, and far less liable to be
+disturbed by accidental causes. It is nearly, and perhaps
+totally impossible to change the focus of the eye, without some
+motion of its axis. The eyes sympathize perfectly with each
+other; and the change of focus is almost inseparable from a
+change of the relative situation of the optic axes; so much, that
+if I direct both my eyes at an object beyond their furthest focus,
+I cannot avoid bringing that focus a little nearer: while one
+axis moves, it is not easy to keep the other perfectly at rest;
+and it is not impossible, that a change in the proportions of some
+eyes, may render a slight alteration of the position of the axis
+absolutely necessary. These considerations may partly explain
+the trifling difference in the place of the cornea that was observed
+in 1794. It appears that the experiments of 1795 were
+made with considerable accuracy, and no doubt with excellent
+instruments; and their failing to ascertain the existence of any
+change, induced Mr. <span class="smcap">Home</span> and Mr. <span class="smcap">Ramsden</span> to abandon,
+in great measure, the opinion which suggested them, and to
+suppose, that a change of the cornea produces only one-third of
+the effect. Dr. <span class="smcap">Olbers</span> of Bremen, who in the year 1780
+published a most elaborate dissertation on the internal changes
+of the eye,‍&#x2060;<a id="FNanchor_16_16" href="#Footnote_16_16" class="fnanchor">16</a> which he lately presented to the Royal Society,
+had been equally unsuccessful in his attempts to measure this
+change of the cornea, at the same time that his opinion was in
+favour of its existence.</p>
+
+<p><span class="pagenum" id="Page_55">55</span></p>
+
+<p>Room was however still left for a repetition of the experiments;
+and I began with an apparatus nearly resembling that
+which Mr. <span class="smcap">Home</span> has described. I had an excellent achromatic
+microscope, made by Mr. <span class="smcap">Ramsden</span> for my friend Mr. <span class="smcap">John
+Ellis</span>, of five inches focal length, magnifying about 20 times.
+To this I adapted a cancellated micrometer, in the focus of the
+eye not employed in looking through the microscope: it was
+a large card, divided by horizontal and vertical lines into
+fortieths of an inch. When the image in the microscope was compared
+with this scale, care was taken to place the head so that
+the relative motion of the images on the micrometer, caused by
+the unsteadiness of the optic axis, should always be in the direction
+of the horizontal lines, and that there could be no error,
+from this motion, in the dimensions of the image taken vertically.
+I placed two candles so as to exhibit images in a vertical
+position in the eye of Mr. <span class="smcap">König</span>, who had the goodness to
+assist me; and, having brought them into the field of the microscope,
+where they occupied 35 of the small divisions, I
+desired him to fix his eye on objects at different distances in the
+same direction: but I could not perceive the least variation in the
+distance of the images.</p>
+
+<p>Finding a considerable difficulty in a proper adjustment of
+the microscope, and being able to depend on my naked eye in
+measuring distances, without an error of one 500th of an inch, I
+determined to make a similar experiment without any magnifying
+power. I constructed a divided eye-glass of two portions of
+a lens, so small, that they passed between two images reflected
+from my own eye; and, looking in a glass, I brought the apparent
+places of the images to coincide, and then made the
+change requisite for viewing nearer objects: but the images still
+<span class="pagenum" id="Page_56">56</span>coincided. Neither could I observe any change in the images
+reflected from the other eye, where they could be viewed with
+greater convenience, as they did not interfere with the eye-
+glass. But, not being at that time aware of the perfect sympathy
+of the eyes, I thought it most certain to confine my observation
+to the one with which I saw. I must remark that, by a
+little habit, I have acquired a very ready command over the
+accommodation of my eye, so as to be able to view an object
+with attention, without adjusting my eye to its distance.</p>
+
+<p>I also stretched two threads, a little inclined to each other,
+across a ring, and divided them by spots of ink into equal
+spaces. I then fixed the ring, applied my eye close behind it,
+and placed two candles in proper situations before me, and a
+third on one side, to illuminate the threads. Then, setting a
+small looking-glass, first at four inches distance, and next at
+two, I looked at the images reflected in it, and observed at
+what part of the threads they exactly reached across in each
+case; and with the same result as before.</p>
+
+<p>I next fixed the cancellated micrometer at a proper distance,
+illuminated it strongly, and viewed it through a pin-hole, by
+which means it became distinct in every state of the eye; and,
+looking with the other eye into a small glass, I compared the
+image with the micrometer, in the manner already described.
+I then changed the focal distance of the eye, so that the lucid
+points appeared to spread into surfaces, from being too remote
+for perfect vision; and I noted on the scale, the distance of their
+centres; but that distance was invariable.</p>
+
+<p>Lastly, I drew a diagonal scale, with a diamond, on a looking-
+glass, (Plate III. <a href="#Pl.III">Fig. 12</a>.) and brought the images into contact
+with the lines of the scale. Then, since the image of the
+<span class="pagenum" id="Page_57">57</span>eye occupies on the surface of a glass half its real dimensions,
+at whatever distance it is viewed, its true size is always double
+the measure thus obtained. I illuminated the glass strongly,
+and made a perforation in a narrow slip of black card, which I
+held between the images; and was thus enabled to compare
+them with the scale, although their apparent distance was double
+that of the scale. I viewed them in all states of the eye;
+but I could perceive no variation in the interval between them.</p>
+
+<p>The sufficiency of these methods may be thus demonstrated.
+Make a pressure along the edge of the upper eyelid with any small
+cylinder, for instance a pencil, and the optometer will show that
+the focus of horizontal rays is a little elongated, while that of
+vertical rays is shortened; an effect which can only be owing to a
+change of curvature in the cornea. Not only the apparatus here
+described, but even the eye unassisted, will be capable of discovering
+a considerable change in the images reflected from the cornea,
+although the change be much smaller than that which is requisite
+for the accommodation of the eye to different distances.
+On the whole, I cannot hesitate to conclude, that if the radius
+of the cornea were diminished but one-twentieth, the change
+would be very readily perceptible by some of the experiments
+related; and the whole alteration of the eye requires one-fifth.</p>
+
+<p>But a much more accurate and decisive experiment remains. I
+take out of a small botanical microscope, a double convex lens, of
+eight-tenths radius and focal distance, fixed in a socket one-fifth
+of an inch in depth; securing its edges with wax, I drop into it a
+little water, nearly cold, till it is three-fourths full, and then apply
+it to my eye, so that the cornea enters halfway into the socket,
+and is every where in contact with the water. (Plate III. <a href="#Pl.III">Fig. 13</a>.)
+My eye immediately becomes presbyopic, and the refractive
+<span class="pagenum" id="Page_58">58</span>power of the lens, which is reduced by the water to a focal
+length of about 16 tenths, (Cor. 5. Prop. IV.) is not sufficient
+to supply the place of the cornea, rendered inefficacious by the
+intervention of the water; but the addition of another lens, of
+five inches and a half focus, restores my eye to its natural state,
+and somewhat more. I then apply the optometer, and I find
+the same inequality in the horizontal and vertical refractions as
+without the water; and I have, in both directions, a power of
+accommodation equivalent to a focal length of four inches, as
+before. At first sight indeed, the accommodation appears to
+be somewhat less, and only able to bring the eye from the state
+fitted for parallel rays to a focus at five inches distance; and
+this made me once imagine, that the cornea might have some
+slight effect in the natural state; but, considering that the artificial
+cornea was about a tenth of an inch before the place of
+the natural cornea, I calculated the effect of this difference, and
+found it exactly sufficient to account for the diminution of the
+range of vision. I cannot ascertain the distance of the glass
+lens from the cornea to the hundredth of an inch; but the error
+cannot be much greater, and it may be on either side.</p>
+
+<p>After this, it is almost necessary to apologize for having
+stated the former experiments; but, in so delicate a subject, we
+cannot have too great a variety of concurring evidence.</p>
+
+
+<p class="mt2em ti0">IX. Having satisfied myself that the cornea is not concerned
+in the accommodation of the eye, my next object was to inquire
+if any alteration in the length of its axis could be discovered;
+for this appeared to be the only possible alternative: and, considering
+that such a change must amount to one-seventh of the
+diameter of the eye, I flattered myself with the expectation of
+submitting it to measurement. Now, if the axis of the eye
+<span class="pagenum" id="Page_59">59</span>were elongated one-seventh, its transverse diameter must be
+diminished one-fourteenth, and the semi-diameter would be
+shortened a thirtieth of an inch.</p>
+
+<p>I therefore placed two candles so that when the eye was
+turned inwards, and directed towards its own image in a glass,
+the light reflected from one of the candles by the sclerotica
+appeared upon its external margin, so as to define it distinctly
+by a bright line; and the image of the other candle was seen in
+the centre of the cornea. I then applied the double eye-glass,
+and the scale of the looking-glass, in the manner already described;
+but neither of them indicated any diminution of the
+distance, when the focal length of the eye was changed.</p>
+
+<p>Another test, and a much more delicate one, was the application
+of the ring of a key at the external angle, when the eye
+was turned as much inwards as possible, and confined at the
+same time by a strong oval iron ring, pressed against it at the
+internal angle. The key was forced in as far as the sensibility
+of the integuments would admit, and was wedged, by a moderate
+pressure, between the eye and the bone. In this situation,
+the phantom caused by the pressure extended within the field
+of perfect vision, and was very accurately defined; nor did it,
+as I formerly imagined, by any means prevent a distinct perception
+of the objects actually seen in that direction; and a straight
+line coming within the field of this oval phantom, appeared
+somewhat inflected towards its centre; (Plate III. <a href="#Pl.III">Fig. 14</a>.)
+a distortion easily understood by considering the effect of the
+pressure on the form of the retina. Supposing now, the distance
+between the key and the iron ring to have been, as it
+really was, invariable, the elongation of the eye must have been
+either totally or very nearly prevented; and, instead of an
+<span class="pagenum" id="Page_60">60</span>increase of the length of the eye’s axis, the oval spot caused
+by the pressure would have spread over a space at least ten
+times as large as the most sensible part of the retina. But no
+such circumstance took place: the power of accommodation
+was as extensive as ever; and there was no perceptible change,
+either in the size or in the figure of the oval spot.</p>
+
+<p>Again, since the rays which pass through the centre of the
+pupil, or rather the anterior vertex of the lens, may, as already
+observed, be considered as delineating the image; and, since
+the divergence of these rays with respect to each other, is but
+little affected by the refraction of the lens, they may still be
+said to diverge from the centre of the pupil; and the image of
+a given object on the retina must be very considerably enlarged,
+by the removal of the retina to a greater distance from
+the pupil and lens. (Cor. Prop. V‍&#x2060;<a id="FNanchor_17_17" href="#Footnote_17_17" class="fnanchor">17</a>&#x2060;.) To ascertain the real
+magnitude of the image with accuracy, is not so easy as it at
+first sight appears; but, besides the experiment last related,
+which might be employed as an argument to this purpose, there
+are two other methods of estimating it. The first is too hazardous
+to be of much use; but, with proper precautions, it may be
+attempted. I fix my eye on a brass circle placed in the rays of
+the sun, and, after some time, remove it to the cancellated micrometer;
+then, changing the focus of my eye, while the micrometer
+remains at a given distance, I endeavour to discover
+whether there is any difference in the apparent magnitude of the
+spectrum on the scale; but I can discern none. I have not insisted
+on the attempt; especially as I have not been able to make the
+<span class="pagenum" id="Page_61">61</span>spectrum distinct enough without inconvenience; and no light
+is sufficiently strong to cause a permanent impression on any
+part of the retina remote from the visual axis. I therefore had
+recourse to another experiment, I placed two candles so as
+exactly to answer to the extent of the termination of the optic
+nerve, and, marking accurately the point to which my eye was
+directed, I made the utmost change in its focal length; expecting
+that, if there were any elongation of the axis, the external
+candle would appear to recede outwards upon the visible space.
+(Plate III. <a href="#Pl.III">Fig. 15</a>.) But this did not happen; the apparent place
+of the obscure part was precisely the same as before. I will
+not undertake to say, that I could have observed a very minute
+difference either way: but I am persuaded, that I should have
+discovered an alteration of less than a tenth part of the whole.</p>
+
+<p>It may be inquired if no change in the magnitude of the
+image is to be expected on any other supposition; and it will
+appear to be possible, that the changes of curvature may be so
+adapted, that the magnitude of the confused image may remain
+perfectly constant. Indeed, to calculate from the dimensions
+which we have hitherto used, it would be expected that the
+image should be diminished about one-sixtieth, by the utmost
+increase of the convexity of the lens. But the whole depends
+on the situation of the refracting surfaces, and the respective
+increase of their curvature, which, on account of the variable
+density of the lens, can scarcely be estimated with sufficient
+accuracy. Had the pupil been placed before the cornea, the
+magnitude of the image must, on any supposition, have been
+very variable: at present, this inconvenience is avoided by the
+situation of the pupil; so that we have here an additional
+instance of the perfection of this admirable organ.</p>
+
+<p><span class="pagenum" id="Page_62">62</span></p>
+
+<p>From the experiments related, it appears to be highly improbable
+that any material change in the length of the axis
+actually takes place; and it is almost impossible to conceive by
+what power such a change could be effected. The straight
+muscles, with the adipose substance lying under them, would
+certainly, when acting independently of the socket, tend to
+flatten the eye: for, since their contraction would necessarily
+lessen the circumference or superficies of the mass that they
+contain, and round off all its prominences, their attachment
+about the nerve and the anterior part of the eye must therefore
+be brought nearer together. (Plate V. <a href="#Pl.V">Fig. 21, 22</a>.) Dr.
+<span class="smcap">Olbers</span> compares the muscles and the eye to a cone, of which
+the sides are protruded, and would by contraction be brought
+into a straight line. But this would require a force to preserve
+the cornea as a fixed point, at a given distance from the origin
+of the muscles; a force which certainly does not exist. In the
+natural situation of the visual axis, the orbit being conical, the
+eye might be somewhat lengthened, although irregularly, by
+being forced further into it; but, when turned towards either
+side, the same action would rather shorten its axis; nor is there
+any thing about the human eye that could supply its place.
+In quadrupeds, the oblique muscles are wider than in man;
+and in many situations might assist in the effect. Indeed a
+portion of the orbicular muscle of the globe is attached so near
+to the nerve, that it might also co-operate in the action: and I
+have no reason to doubt the accuracy of Dr. <span class="smcap">Olbers</span>, who
+states, that he effected a considerable elongation, by tying threads
+to the muscles, in the eyes of hogs and of calves; yet he does
+not say in what position the axis was fixed; and the flaccidity
+of the eye after death might render such a change very easy as
+<span class="pagenum" id="Page_63">63</span>would be impossible in a living eye. Dr. <span class="smcap">Olbers</span> also mentions
+an observation of Professor <span class="smcap">Wrisberg</span>, on the eye of a man
+whom he believed to be destitute of the power of accommodation
+in his life-time, and whom he found, after death, to have
+wanted one or more of the muscles: but this want of accommodation
+was not at all accurately ascertained. I measured, in
+the human eye, the distance of the attachment of the inferior
+oblique muscle from the insertion of the nerve: it was one-fifth
+of an inch; and from the centre of vision not a tenth of an
+inch; so that, although the oblique muscles do in some positions
+nearly form a part of a great circle round the eye, their action
+would be more fitted to flatten than to elongate it. We have
+therefore reason to agree with <span class="smcap">Winslow</span>, in attributing to them
+the office of helping to support the eye on that side where the
+bones are most deficient: they seem also well calculated to
+prevent its being drawn too much backwards by the action of
+the straight muscles. And, even if there were no difficulty in
+supposing the muscles to elongate the eye in every position, yet
+at least some small difference would be expected in the extent
+of the change, when the eye is in different situations, at an
+interval of more than a right angle from each other; but the
+optometer shews that there is none.</p>
+
+<p>Dr. <span class="smcap">Hosack</span> alleges that he was able, by making a pressure
+on the eye, to accommodate it to a nearer object:‍&#x2060;<a id="FNanchor_18_18" href="#Footnote_18_18" class="fnanchor">18</a> it does not
+appear that he made use of very accurate means of ascertaining
+the fact; but, if such an effect took place, the cause must have
+been an inflection of the cornea.</p>
+
+<p>It is unnecessary to dwell on the opinion which supposes a
+joint operation, of changes in the curvature of the cornea and
+<span class="pagenum" id="Page_64">64</span>in the length of the axis. This opinion had derived very great
+respectability, from the most ingenious and elegant manner in
+which Dr. <span class="smcap">Olbers</span> had treated it, and from being the last result
+of the investigation of Mr. <span class="smcap">Home</span> and Mr. <span class="smcap">Ramsden</span>. But
+either of the series of experiments which have been related,
+appears to be sufficient to confute it.</p>
+
+
+<p class="mt2em ti0">X. It now remains to inquire into the pretensions of the
+crystalline lens to the power of altering the focal length of the
+eye. The grand objection to the efficacy of a change of figure
+in the lens, was derived from the experiments in which those
+who have been deprived of it have appeared to possess the
+faculty of accommodation.</p>
+
+<p>My friend Mr. <span class="smcap">Ware</span>, convinced as he was of the neatness
+and accuracy of the experiments related in the Croonian Lecture
+for 1795, yet could not still help imagining, from the obvious
+advantage all his patients found, after the extraction
+of the lens, in using two kinds of spectacles, that there must,
+in such cases, be a deficiency in that faculty. This circumstance,
+combined with a consideration of the directions very judiciously
+given by Dr. <span class="smcap">Porterfield</span>, for ascertaining the point in question,
+first made me wish to repeat the experiments upon various
+individuals, and with the instrument which I have above described
+as an improvement of Dr. <span class="smcap">Porterfield</span>’s optometer:
+and I must here acknowledge my great obligation to Mr.
+<span class="smcap">Ware</span>, for the readiness and liberality with which he introduced
+me to such of his numerous patients as he thought most
+likely to furnish a satisfactory determination. It is unnecessary
+to enumerate every particular experiment; but the universal
+result is, contrary to the expectation with which I entered on
+the inquiry, that in an eye deprived of the crystalline lens, the
+<span class="pagenum" id="Page_65">65</span>actual focal distance is totally unchangeable. This will appear
+from a selection of the most decisive observations.</p>
+
+<p>1. Mr. R. can read at four inches and at six only, with the
+same glass. He saw the double lines meeting at three inches,
+and always at the same point; but the cornea was somewhat
+irregularly prominent, and his vision not very distinct; nor had
+I, at the time I saw him, a convenient apparatus.</p>
+
+<p>I afterwards provided a small optometer, with a lens of less
+than two inches focus, adding a series of letters, not in alphabetical
+order, and projected into such a form as to be most legible
+at a small inclination. The excess of the magnifying power
+had the advantage of making the lines more divergent, and
+their crossing more conspicuous; and the letters served for
+more readily naming the distance of the intersection, and, at
+the same time, for judging of the extent of the power of distinguishing
+objects too near or too remote for perfect vision.
+(Plate V. <a href="#Pl.V">Fig. 23</a>.)</p>
+
+<p>2. Mr. J. had not an eye very proper for the experiment;
+but he appeared to distinguish the letters at <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/49.svg" alt=" " data-tex="\(2\frac{1}{2}\)"> inches, and
+at less than an inch. This at first persuaded me, that he
+must have a power of changing the focal distance: but I afterwards
+recollected that he had withdrawn his eye considerably,
+to look at the nearer letters, and had also partly closed his
+eyelids, no doubt contracting at the same time the aperture of
+the pupil; an action which, even in a perfect eye, always accompanies
+the change of focus. The slider was not applied.</p>
+
+<p>3. Miss H. a young lady of about twenty, had a very narrow
+pupil, and I had not an opportunity of trying the small optometer:
+but, when she once saw an object double through the
+slits, no exertion could make it appear single at the same distance.
+<span class="pagenum" id="Page_66">66</span>She used for distant objects a glass of <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/52.svg" alt=" " data-tex="\(4\frac{1}{2}\)"> inches focus;
+with this she could read as far off as 12 inches, and as near as
+five: for nearer objects she added another of equal focus, and
+could then read at 7 inches, and at <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/49.svg" alt=" " data-tex="\(2\frac{1}{2}\)">.</p>
+
+<p>4. <span class="smcap">Hanson</span>, a carpenter, aged 63, had a cataract extracted
+a few years since from one eye: the pupil was clear and large,
+and he saw well to work with a lens of <img style="vertical-align: -0.816ex; width: 2.927ex; height: 2.771ex;" src="images/53.svg" alt=" " data-tex="\(2\frac{3}{8}\)"> inches focus; and
+could read at 8 and at 15 inches, but most conveniently at 11.
+With the same glass, the lines of the optometer appeared always
+to meet at 11 inches; but he could not perceive that they
+crossed, the line being too strong, and the intersection too distant.
+The experiment was afterwards repeated with the small
+optometer: he read the letters from 2 to 3 inches; but the
+intersection was always at <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/49.svg" alt=" " data-tex="\(2\frac{1}{2}\)"> inches. He now fully understood
+the circumstances that were to be noticed, and saw the crossing
+with perfect distinctness: at one time, he said it was a tenth of
+an inch nearer; but I observed that he had removed his eye
+two or three tenths from the glass, a circumstance which
+accounted for this small difference.</p>
+
+<p>5. Notwithstanding <span class="smcap">Hanson</span>’s age, I consider him as a very
+fair subject for the experiment. But a still more unexceptionable
+eye was that of Mrs. <span class="smcap">Maberly</span>. She is about 30, and had
+the crystalline of both eyes extracted a few years since, but
+sees best with her right. She walks without glasses; and, with
+the assistance of a lens of about four inches focus, can read
+and work with ease. She could distinguish the letters of the
+small optometer from an inch to <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/49.svg" alt=" " data-tex="\(2\frac{1}{2}\)"> inches; but the intersection
+was invariably at the same point, about 19 tenths of an inch
+distant. A portion of the capsule is stretched across the pupil,
+and causes her to see remote objects double, when without her
+<span class="pagenum" id="Page_67">67</span>glasses; nor can she, by any exertion, bring the two images
+nearer together, although the exertion makes them more distinct,
+no doubt by contracting the pupil. The experiment with
+the optometer was conducted, in the presence of Mr. <span class="smcap">Ware</span>,
+with patience and perseverance; nor was any opinion given to
+make her report partial.</p>
+
+<p>Considering the difficulty of finding an eye perfectly suitable
+for the experiments, these proofs may be deemed tolerably
+satisfactory. But, since one positive argument will counterbalance
+many negative ones, provided it be equally grounded
+on fact, it becomes necessary to inquire into the competency of
+the evidence employed to ascertain the power of accommodation
+attributed, in the Croonian Lecture for 1794, to the eye of
+<span class="smcap">Benjamin Clerk</span>. And it appears, that the distinction long
+since very properly made by Dr. <span class="smcap">Jurin</span>, between distinct vision
+and perfect vision, will readily explain away the whole of that
+evidence.</p>
+
+<p>It is obvious that vision may be made distinct to any given
+extent, by means of an aperture sufficiently small, provided at
+the same time, that a sufficient quantity of light be left, while
+the refractive powers of the eye remain unchanged. And it is
+remarkable, that in those experiments, when the comparison
+with the perfect eye was made, the aperture of the imperfect
+eye only was very considerably reduced. <span class="smcap">Benjamin Clerk</span>,
+with an aperture of <img style="vertical-align: -0.816ex; width: 2.595ex; height: 2.771ex;" src="images/54.svg" alt=" " data-tex="\(\frac{3}{40}\)"> of an inch, could read with the same
+glass at <img style="vertical-align: -0.816ex; width: 2.927ex; height: 2.789ex;" src="images/55.svg" alt=" " data-tex="\(1\frac{7}{8}\)"> inch, and at 7 inches.‍&#x2060;<a id="FNanchor_19_19" href="#Footnote_19_19" class="fnanchor">19</a> With an equal aperture, I
+can read at <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/56.svg" alt=" " data-tex="\(1\frac{1}{2}\)"> inch and at 30 inches: and I can retain the state
+of perfect relaxation, and read with the same aperture at <img style="vertical-align: -0.781ex; width: 2.927ex; height: 2.737ex;" src="images/57.svg" alt=" " data-tex="\(2\frac{1}{4}\)">
+inches; and this is as great a difference as was observed in
+<span class="pagenum" id="Page_68">68</span><span class="smcap">Benjamin Clerk</span>’s eye. It is also a fact of no small importance,
+that Sir <span class="smcap">Henry Englefield</span> was much astonished, as
+well as the other observers, at the accuracy with which the
+man’s eye was adjusted to the same distance, in the repeated
+trials that were made with it.‍&#x2060;<a id="FNanchor_20_20" href="#Footnote_20_20" class="fnanchor">20</a> This circumstance alone makes
+it highly probable, that its perfect vision was confined within
+very narrow limits.</p>
+
+<p>Hitherto I have endeavoured to shew the inconveniences
+attending other suppositions, and to remove the objections to
+the opinion of an internal change of the figure of the lens.
+I shall now state two experiments, which, in the first place, come
+very near to a mathematical demonstration of the existence of
+such a change, and, in the second, explain in great measure its
+origin, and the manner in which it is effected.</p>
+
+<p>I have already described the appearances of the imperfect
+image of a minute point at different distances from the eye, in
+a state of relaxation. For the present purpose, I will only
+repeat, that if the point is beyond the furthest focal distance of
+the eye, it assumes that appearance which is generally described
+by the name of a star, the central part being considerably the
+brightest. (Plate VI. F<a href="#Pl.VI">ig. 36—39</a>.) But, when the focal distance
+of the eye is shortened, the imperfect image is of course
+enlarged; and, besides this necessary consequence, the light is
+also very differently distributed; the central part becomes faint,
+and the margin strongly illuminated, so as to have almost
+the appearance of an oval ring. (<a href="#Pl.VI">Fig. 41</a>.) If I apply the
+slider of the optometer, the shadows of the slits, while the eye
+is relaxed, are perfectly straight, dividing the oval either way
+into parallel segments: (<a href="#Pl.VI">Fig. 42, 44</a>.) but, when the accommodation<span class="pagenum" id="Page_69">69</span>
+takes place, they immediately become curved, and the
+more so the further they are from the centre of the image, to
+which their concavity is directed. (<a href="#Pl.VI">Fig. 43, 45</a>.) If the point
+be brought much within the focal distance, the change of the
+eye will increase the illumination of the centre, at the expense
+of the margin. The same appearances are equally observable,
+when the effect of the cornea is removed by immersion in water;
+and the only imaginable way of accounting for the diversity, is
+to suppose the central parts of the lens to acquire a greater
+degree of curvature than the marginal parts. If the refraction
+of the lens remained the same, it is absolutely impossible that
+any change of the distance of the retina should produce a curvature
+in those shadows, which, in the relaxed state of the eye,
+are found to be in all parts straight; and, that neither the form
+nor the relative situation of the cornea is concerned, appears
+from the application of water already mentioned.</p>
+
+<p>The truth of this explanation is fully confirmed by the optometer.
+When I look through four narrow slits, without exertion,
+the lines always appear to meet in one point: but, when I
+make the intersection approach me, the two outer lines meet
+considerably beyond the inner ones, and the two lines of the
+same side cross each other at a still greater distance. (Plate V.
+<a href="#Pl.V">Fig. 24</a>.)</p>
+
+<p>The experiment will not succeed with every eye; nor can it
+be expected that such an imperfection should be universal: but
+one case is sufficient to establish the argument, even if no other
+were found. I do not however doubt, that in those who have a
+large pupil, the aberration may be very frequently observable.
+In Dr. <span class="smcap">Wollaston</span>’s eye, the diversity of appearance is imperceptible;
+but Mr. <span class="smcap">König</span> described the intersections exactly as
+<span class="pagenum" id="Page_70">70</span>they appear to me, although he had received no hint of what I
+had observed. The lateral refraction is the most easily ascertained,
+by substituting for the slits a tapering piece of card, so
+as to cover all the central parts of the pupil, and thus determining
+the nearest crossing of the shadows transmitted through
+the marginal parts only. When the furthest intersection was at
+38, I could bring it to 22 parts with two narrow slits; but with
+the tapered card only to 29. From these data we may determine
+pretty nearly, into what form the lens must be changed,
+supposing both the surfaces to undergo proportional alterations
+of curvature, and taking for granted the dimensions already
+laid down: for, from the lateral aberration thus given, we may
+find (by Prop. III.) the subtangents at about one-tenth of an
+inch from the axis; and the radius of curvature at each vertex,
+is already determined to be about 21 and 15 hundredths of an
+inch. Hence the anterior surface must be a portion of a hyperboloid,
+of which the greater axis is about 50; and the posterior
+surface will be nearly parabolical. In this manner the change
+will be effected, without any diminution of the transverse diameter
+of the lens. The elongation of its axis will not exceed
+the fiftieth of an inch; and, on the supposition with which we
+set out, the protrusion will be chiefly at the posterior vertex.
+The form of the lens thus changed will be nearly that of Plate V.
+<a href="#Pl.V">Fig. 26</a>; the relaxed state being nearly as represented in Fig. 25.
+Should, however, the rigidity of the internal parts, or any other
+considerations, render it convenient to suppose the anterior surface
+more changed, it would still have room, without interfering
+with the uvea; or it might even force the uvea a little forwards,
+without any visible alteration of the external appearance of
+the eye.</p>
+
+<p><span class="pagenum" id="Page_71">71</span></p>
+
+<p>From this investigation of the change of the figure of the
+lens, it appears that the action which I formerly attributed to
+the external coats, cannot afford an explanation of the phenomenon.
+The necessary effect of such an action would be, to
+produce a figure approaching to that of an oblate spheroid;
+and, to say nothing of the inconvenience attending a diminution
+of the diameter of the lens, the lateral refraction would
+be much more increased than the central; nor would the
+slight change of density, at an equal distance from the axis,
+be at all equivalent to the increase of curvature: we must
+therefore suppose some different mode of action in the power
+producing the change. Now, whether we call the lens a
+muscle or not, it seems demonstrable, that such a change of
+figure takes place as can be produced by no external cause;
+and we may at least illustrate it by a comparison with the
+usual action of muscular fibres. A muscle never contracts,
+without at the same time swelling laterally, and it is of no
+consequence which of the effects we consider as primary. I
+was induced, by an occasional opacity, to give the name of
+membranous tendons to the radiations from the centre of the
+lens; but, on a more accurate examination, nothing really analogous
+to tendon can be discovered. And, if it were supposed
+that the parts next the axis were throughout of a tendinous, and
+therefore unchangeable nature, the contraction must be principally
+effected by the lateral parts of the fibres; so that the coats
+would become thicker towards the margin, by their contraction,
+while the general alteration of form would require them to be
+thinner; and there would be a contrariety in the actions of the
+various parts. But, if we compare the central parts of each
+surface to the belly of the muscle, there is no difficulty in
+<span class="pagenum" id="Page_72">72</span>conceiving their thickness to be immediately increased, and to
+produce an immediate elongation of the axis, and an increase
+of the central curvature; while the lateral parts co-operate
+more or less, according to their distance from the centre, and
+in different individuals in somewhat different proportions. On
+this supposition, we have no longer any difficulty in attributing
+a power of change to the crystalline of fishes. M. <span class="smcap">Petit</span>, in a
+great number of observations, uniformly found the lens of
+fishes more or less flattened: but, even if it were not, a slight
+extension of the lateral part of the superficial fibres would allow
+those softer coats to become thicker at each vertex, and to form
+the whole lens into a spheroid somewhat oblong; and here, the
+lens being the only agent in refraction, a less alteration than in
+other animals would be sufficient. It is also worthy of inquiry,
+whether the state of contraction may not immediately add to
+the refractive power. According to the old experiment, by
+which Dr. <span class="smcap">Goddard</span> attempted to show that muscles become
+more dense as they contract, such an effect might naturally
+be expected. That experiment is, however, very indecisive, and
+the opinion is indeed generally exploded, but perhaps too hastily;
+and whoever shall ascertain the existence or non-existence
+of such a condensation, will render essential service to physiology
+in general.</p>
+
+<p>Dr. <span class="smcap">Pemberton</span>, in the year 1719, first systematically discussed
+the opinion of the muscularity of the crystalline lens.‍&#x2060;<a id="FNanchor_21_21" href="#Footnote_21_21" class="fnanchor">21</a>
+He referred to <span class="smcap">Leeuwenhoek</span>’s microscopical observations;
+but he so overwhelmed his subject with intricate calculations,
+that few have attempted to develope it: and he grounded the
+<span class="pagenum" id="Page_73">73</span>whole on an experiment borrowed from <span class="smcap">Barrow</span>, which with
+me has totally failed; and I cannot but agree with Dr. <span class="smcap">Olbers</span>
+in the remark, that it is easier to confute him than to understand
+him. He argued for a partial change of the figure of the lens;
+and perhaps the opinion was more just than the reasons adduced
+for its support. <span class="smcap">Lobe′</span>, or rather <span class="smcap">Albinus</span>,‍&#x2060;<a id="FNanchor_22_22" href="#Footnote_22_22" class="fnanchor">22</a> decidedly favours
+a similar theory; and suggests the analogy of the lens to the
+muscular parts of pellucid animals, in which even the best
+microscopes can discover no fibres. <span class="smcap">Camper</span> also mentions
+the hypothesis with considerable approbation.‍&#x2060;<a id="FNanchor_23_23" href="#Footnote_23_23" class="fnanchor">23</a> Professor <span class="smcap">Reil</span>
+published, in 1793, a Dissertation on the Structure of the Lens;
+and, in a subsequent paper, annexed to the translation of my
+former Essay in Professor <span class="smcap">Gren</span>’s Journal,‍&#x2060;<a id="FNanchor_24_24" href="#Footnote_24_24" class="fnanchor">24</a> he discussed the
+question of its muscularity. I regret that I have not now an
+opportunity of referring to this publication; but I do not recollect
+that Professor <span class="smcap">Reil</span>’s objections are different from those
+which I have already noticed.</p>
+
+<p>Considering the sympathy of the crystalline lens with the
+uvea, and the delicate nature of the change of its figure, there
+is little reason to expect that any artificial stimulus would be
+more successful in exciting a contractive action in the lens, than
+it has hitherto been in the uvea; much less would that contraction
+be visible without art. Soon after Mr. <span class="smcap">Hunter</span>’s death, I
+pursued the experiment which he had suggested, for ascertaining
+how far such a contraction might be observable. My apparatus
+(Plate V. <a href="#Pl.V">Fig. 27</a>.) was executed by Mr. <span class="smcap">Jones</span>. It
+consisted of a wooden vessel blacked within, which was to be
+<span class="pagenum" id="Page_74">74</span>filled with cool, and then with warmer water: a plane speculum
+was placed under it; a perforation in the bottom was filled with
+a plate of glass; proper rings were fixed for the reception of
+the lens, or of the whole eye, and also wires for transmitting
+electricity: above these, a piece of ground and painted glass,
+for receiving the image, was supported by a bracket, which
+moved by a pivot, in connection with a scale divided into fiftieths
+of an inch. With this apparatus I made some experiments,
+assisted by Mr. <span class="smcap">Wilkinson</span>, whose residence was near
+a slaughter-house: but we could obtain, by this method, no
+satisfactory evidence of the change; nor was our expectation
+much disappointed. I understand also, that another member
+of this Society was equally unsuccessful, in attempting to produce
+a conspicuous change in the lens by electricity.</p>
+
+
+<p class="mt2em ti0">XI. In man and in the most common quadrupeds, the structure
+of the lens is nearly similar. The number of radiations is of
+little consequence; but I find that in the human crystalline there
+are ten on each side, (Plate VI. <a href="#Pl.VI">Fig. 46</a>.) not three, as I once,
+from a hasty observation, concluded.‍&#x2060;<a id="FNanchor_25_25" href="#Footnote_25_25" class="fnanchor">25</a> Those who find any
+difficulty in discovering the fibres, must have a sight very ill
+adapted to microscopical researches, I have laboured with the
+most obstinate perseverance to trace nerves into the lens, and
+I have sometimes imagined that I had succeeded; but I cannot
+positively go further than to state my full conviction of their
+existence, and of the precipitancy of those who have absolutely
+denied it. The long nerves, which are very conspicuous between
+the choroid and sclerotic coats, divide each into two,
+three, or more branches, at the spot where the ciliary zone
+begins, and seem indeed to furnish the choroid with some fine
+<span class="pagenum" id="Page_75">75</span>filaments at the same place. The branches often re-unite, with
+a slight protuberance, that scarcely deserves the name of a
+ganglion: here they are tied down, and mixed with the hard
+whitish-brown membrane that covers the compact spongy substance,
+in which the vessels of the ciliary processes anastomose
+and subdivide. (Plate VI. <a href="#Pl.VI">Fig. 47</a>.) The quantity of the
+nerves which proceeds to the iris, appears to be considerably
+smaller than that which arrives at the place of division: hence
+there can be little doubt that the division is calculated to supply
+the lens with some minute branches; and it is not improbable,
+from the appearance of the parts, that some fibres may pass to
+the cornea; although it might more naturally be expected, that
+the tunica conjunctiva would be supplied from without. But
+the subdivisions which probably pass to the lens, enter immediately
+into a mixture of ligamentous substance and of a tough
+brownish membrane; and I have not hitherto been able to
+develope them. Perhaps animals may be found in which this
+substance is of a different nature; and I do not despair that,
+with the assistance of injections, for more readily distinguishing
+the blood vessels, it may still be possible to trace them in
+quadrupeds. Our inability to discover them, is scarcely an
+argument against their existence: they must naturally be delicate
+and transparent; and we have an instance, in the cornea,
+of considerable sensibility, where no nerve has yet been traced.
+The capsule adheres to the ciliary substance, and the lens to
+the capsule, principally in two or three points; but I confess, I
+have not been able to observe that these points are exactly
+opposite to the trunks of nerves; so that, probably, the adhesion
+is chiefly caused by those vessels which are sometimes seen
+passing to the capsule in injected eyes. We may, however,
+<span class="pagenum" id="Page_76">76</span>discover ramifications from some of these points, upon and
+within the substance of the lens, (Plate VI. <a href="#Pl.VI">Fig. 48</a>.) generally
+following a direction near to that of the fibres, and sometimes
+proceeding from a point opposite to one of the radiating lines of
+the same surface. But the principal vessels of the lens appear
+to be derived from the central artery, by two or three branches
+at some little distance from the posterior vertex; which I
+conceive to be the cause of the frequent adhesion of a portion
+of a cataract to the capsule, about this point: they follow
+nearly the course of the radiations, and then of the fibres;
+but there is often a superficial subdivision of one of the radii,
+at the spot where one of them enters. The vessels coming
+from the choroid appear principally to supply a substance,
+hitherto unobserved, which fills up the marginal part of the
+capsule of the crystalline, in the form of a thin zone, and
+makes a slight elevation, visible even through the capsule.
+(<a href="#Pl.VI">Fig. 49—51</a>.) It consists of coarser fibres than the lens, but
+in a direction nearly similar; they are often intermixed with
+small globules. In some animals, the margin of the zone is
+crenated, especially behind, where it is shorter: this is observable
+in the partridge; and, in the same bird, the whole surface
+of the lens is seen to be covered with points, or rather
+globules, arranged in regular lines, (Plate VII. <a href="#Pl.VII">Fig. 52</a>.) so as
+to have somewhat the appearance of a honeycomb, but towards
+the vertex less uniformly disposed. This regularity is a sufficient
+proof that there could be no optical deception in the appearance;
+although it requires a good microscope to discover it distinctly:
+but the zone may be easily peeled off under water,
+and hardened in spirits. Its use is uncertain; but it may possibly
+secrete the liquid of the crystalline; and it as much deserves the
+<span class="pagenum" id="Page_77">77</span>name of a gland, as the greater part of the substances usually
+so denominated. In peeling it off, I have very distinctly observed
+ramifications, which were passing through it into the lens;
+(Plate VI. <a href="#Pl.VI">Fig. 50</a>.) and indeed it is not at all difficult to
+detect the vessels connecting the margin of the lens with its
+capsule; and it is surprising that M. <span class="smcap">Petit</span> should have
+doubted of their existence. I have not yet clearly discerned
+this crystalline gland in the human eye; but I infer the existence
+of something similar to the globules, from the spotted appearance
+of the image of a lucid point already mentioned; for which
+I can no otherwise account, than by attributing it to a derangement
+of these particles, produced by the external force, and
+to an unequal impression made by them on the surface of
+the lens.</p>
+
+<p>In birds and in fishes, the fibres of the crystalline radiate
+equally, becoming finer as they approach the vertex, till they
+are lost in a uniform substance, of the same degree of firmness,
+which appears to be perforated in the centre by a blood vessel.
+(Plate VII. <a href="#Pl.VII">Fig. 53</a>.) In quadrupeds, the fibres at their angular
+meeting are certainly not continued, as <span class="smcap">Leeuwenhoek</span> imagined,
+across the line of division; but there does not appear to be any
+dissimilar substance interposed between them, except that very
+minute trunks of vessels often mark that line. But, since the
+whole mass of the lens, as far as it is moveable, is probably
+endued with a power of changing its figure, there is no need
+of any strength of union, or place of attachment, for the fibres,
+since the motion meets with little or no resistance. Every
+common muscle, as soon as its contraction ceases, returns to
+its natural form, even without the assistance of an antagonist;
+and the lens itself, when taken out of the eye, in its capsule.
+<span class="pagenum" id="Page_78">78</span>has elasticity enough to reassume its proper figure, on the
+removal of a force that has compressed it. The capsule is
+highly elastic; and, since it is laterally fixed to the ciliary zone,
+it must co-operate in restoring the lens to its flattest form. If
+it be inquired, why the lens is not capable of becoming less
+convex, as well as more so, it may be answered, that the lateral
+parts have probably little contractive power; and, if they had
+more, they would have no room to increase the size of the disc,
+which they must do, in order to shorten the axis; and the parts
+about the axis have no fibres so arranged as to shorten it by
+their own contraction.</p>
+
+<p>I consider myself as being partly repaid for the labour lost in
+search of the nerves of the lens, by having acquired a more
+accurate conception of the nature and situation of the ciliary
+substance. It had already been observed, that in the hare and
+in the wolf, the ciliary processes are not attached to the capsule
+of the lens; and if by the ciliary processes we understand
+those filaments which are seen detached after tearing
+away the capsule, and consist of ramifying vessels, the observation
+is equally true of the common quadrupeds, and I will
+venture to say, of the human eye.‍&#x2060;<a id="FNanchor_26_26" href="#Footnote_26_26" class="fnanchor">26</a> Perhaps this remark
+has been made by others, but the circumstance is not generally
+understood. It is so difficult to obtain a distinct view of
+these bodies, undisturbed, that I am partly indebted to accident,
+for having been undeceived respecting them: but, having once
+made the observation, I have learnt to show it in an unquestionable
+manner. I remove the posterior hemisphere of the
+sclerotica, or somewhat more, and also as much as possible of
+the vitreous humour, introduce the point of a pair of scissors
+<span class="pagenum" id="Page_79">79</span>into the capsule, turn out the lens, and cut off the greater
+part of the posterior portion of the capsule, and of the rest
+of the vitreous humour. I next dissect the choroid and uvea
+from the sclerotica; and, dividing the anterior part of the capsule
+into segments from its centre, I turn them back upon the
+ciliary zone. The ciliary processes then appear, covered with
+their pigment, and perfectly distinct both from the capsule and
+from the uvea; (Plate VII. <a href="#Pl.VII">Fig. 54</a>.) and the surface of the
+capsule is seen shining, and evidently natural, close to the base
+of these substances. I do not deny that the separation between
+the uvea and the processes, extends somewhat further back
+than the separation between the processes and the capsule; but
+the difference is inconsiderable, and, in the calf, does not amount
+to above half the length of the detached part. The appearance
+of the processes is wholly irreconcileable with muscularity; and
+their being considered as muscles attached to the capsule, is
+therefore doubly inadmissible. Their lateral union with the
+capsule, commences at the base of their posterior smooth surface,
+and is continued nearly to the point where they are more
+intimately united with the termination of the uvea; so that,
+however this portion of the base of the processes were disposed
+to contract, it would be much too short to produce any sensible
+effect. What their use may be, cannot easily be determined:
+if it were necessary to have any peculiar organs for secretion,
+we might call them glands, for the percolation of the aqueous
+humour; but there is no reason to think them requisite for this
+purpose.</p>
+
+<p>The marsupium nigrum of birds, and the horse-shoe-like
+appearance of the choroid of fishes, are two substances which
+have sometimes, with equal injustice, been termed muscular.
+All the apparent fibres of the marsupium nigrum are, as
+<span class="pagenum" id="Page_80">80</span><span class="smcap">Haller</span> had very truly asserted, merely duplicatures of a
+membrane, which, when its ends are cut off, may easily be
+unfolded under the microscope, with the assistance of a fine hair
+pencil, so as to leave no longer any suspicion of a muscular
+texture. The experiment related by Mr. <span class="smcap">Home</span>,‍&#x2060;<a id="FNanchor_27_27" href="#Footnote_27_27" class="fnanchor">27</a> can scarcely
+be deemed a very strong argument for attributing to this substance
+a faculty which its appearance so little authorises us to
+expect in it. The red substance in the choroid of fishes,
+(Plate VII. <a href="#Pl.VII">Fig. 55</a>.) is more capable of deceiving the observer;
+its colour gives it some little pretension, and I began to examine
+it with a prepossession in favour of its muscular nature. But,
+when we recollect the general colour of the muscles of fishes,
+the consideration of its redness will no longer have any
+weight. Stripped of the membrane which loosely covers its
+internal surface, (<a href="#Pl.VII">Fig. 56</a>.) it seems to have transverse divisions,
+somewhat resembling those of muscles, and to terminate
+in a manner somewhat similar; (<a href="#Pl.VII">Fig. 57</a>.) but, when
+viewed in a microscope, the transverse divisions appear to be
+cracks, and the whole mass is evidently of a uniform texture,
+without the least fibrous appearance; and, if a particle of any
+kind of muscle is compared with it, the contrast becomes very
+striking. Besides, it is fixed down, throughout its extent, to
+the posterior lamina of the choroid, and has no attachment
+capable of directing its effect; to say nothing of the difficulty
+of conceiving what that effect could be. Its use must remain,
+in common with that of many other parts of the animal frame,
+entirely concealed from our curiosity.</p>
+
+<p>The bony scales of the eyes of birds, which were long ago
+described in the Philosophical Transactions by Mr. <span class="smcap">Ranby</span>,‍&#x2060;<a id="FNanchor_28_28" href="#Footnote_28_28" class="fnanchor">28</a>
+<span class="pagenum" id="Page_81">81</span>and by Mr. <span class="smcap">Warren</span>‍&#x2060;<a id="FNanchor_29_29" href="#Footnote_29_29" class="fnanchor">29</a>&#x2060;,
+ afterwards in two excellent Memoirs of
+M. <span class="smcap">Petit</span> on the eye of the turkey and of the owl,‍&#x2060;<a id="FNanchor_30_30" href="#Footnote_30_30" class="fnanchor">30</a> and lately
+by Mr. <span class="smcap">Pierce Smith</span>,‍&#x2060;<a id="FNanchor_31_31" href="#Footnote_31_31" class="fnanchor">31</a>
+ and Mr, <span class="smcap">Home</span>,‍&#x2060;<a id="FNanchor_32_32" href="#Footnote_32_32" class="fnanchor">32</a> can, on any supposition,
+have but little concern in the accommodation of the eye
+to different distances: they rather seem to be necessary for the
+protection of that organ, large and prominent as it is, and unsupported
+by any strength in the orbit, against the various accidents
+to which the mode of life and rapid motion of those animals
+must expose it; and they are much less liable to fracture
+than an entire bony ring of the same thickness would have been.
+The marsupium nigrum appears to be intended to assist in
+giving strength to the eye, to prevent any change in the
+place of the lens by external force: it is so situated as to intercept
+but little light, and that little is principally what would
+have fallen on the insertion of the optic nerve; and it seems to
+be too firmly tied to the lens, even to admit any considerable
+elongation of the axis of the eye, although it certainly would
+not impede a protrusion of the cornea.</p>
+
+<p>With respect to the eyes of insects, an observation of <span class="smcap">Poupart</span>
+deserves to be repeated here. He remarks, that the eye
+of the libellula is hollow; that it communicates with an air-vessel placed longitudinally in the trunk of the body; and that
+it is capable of being inflated from this cavity: he supposes that
+the insect is provided with this apparatus, in order for the
+accommodation of its eye to the perception of objects at different
+distances.‍&#x2060;<a id="FNanchor_33_33" href="#Footnote_33_33" class="fnanchor">33</a> I have not yet had an opportunity of examining
+<span class="pagenum" id="Page_82">82</span>the eye of the libellula; but there is no difficulty in supposing
+that the means of producing the change of the refractive powers
+of the eye, may be, in different classes of animals, as diversified
+as their habits, and the general conformation of their
+organs.</p>
+
+<p>I beg leave to correct here an observation in my former paper,
+relative to the faint lateral radiations, which I supposed to proceed
+from the margin of the iris.‍&#x2060;<a id="FNanchor_34_34" href="#Footnote_34_34" class="fnanchor">34</a> I find, on further examination,
+that they are occasioned by reflections from the eyelashes.</p>
+
+
+<p class="mt2em ti0">XII. I shall now finally recapitulate the principal objects and
+results of the investigation which I have taken the liberty of
+detailing so fully to the Royal Society. First, the determination
+of the refractive power of a variable medium, and its application
+to the constitution of the crystalline lens. Secondly, the construction
+of an instrument for ascertaining, upon inspection, the
+exact focal distance of every eye, and the remedy for its imperfections.
+Thirdly, to show the accurate adjustment of every
+part of the eye, for seeing with distinctness the greatest possible
+extent of objects at the same instant. Fourthly, to measure
+the collective dispersion of coloured rays in the eye. Fifthly,
+by immerging the eye in water, to demonstrate that its accommodation
+does not depend on any change in the curvature of
+the cornea. Sixthly, by confining the eye at the extremities
+of its axis, to prove that no material alteration of its length can
+take place. Seventhly, to examine what inference can be drawn
+from the experiments hitherto made on persons deprived of the
+lens; to pursue the inquiry, on the principles suggested by Dr.
+<span class="smcap">Porterfield</span>; and to confirm his opinion of the utter inability
+<span class="pagenum" id="Page_83">83</span>of such persons to change the refractive state of the organ.
+Eighthly, to deduce, from the aberration of the lateral rays,
+a decisive argument in favour of a change in the figure of the
+crystalline; to ascertain, from the quantity of this aberration,
+the form into which the lens appears to be thrown in my own
+eye, and the mode by which the change must be produced in
+that of every other person. And I flatter myself, that I shall
+not be deemed too precipitate, in denominating this series of
+experiments satisfactorily demonstrative.</p>
+
+
+<hr class="chap x-ebookmaker-drop">
+<div class="chapter">
+ <h2 class="nobreak" id="CORRECTIONS">
+ CORRECTIONS.
+ </h2>
+</div>
+
+
+
+<p><a href="#Page_28">Page 28</a>, line ii. Prop. III. <i>after e, insert</i> the base being unity.</p>
+
+<p><a href="#Page_30">Page 30</a>, line 8, Cor. 10. <i>for n t u, read n t t</i>; line 9, <i>for</i> product &amp;c., <i>read</i> square
+of the cosine of incidence.</p>
+
+<p><a href="#Page_31">Page 31</a>, line 5, Cor. 11. <i>for</i> <img style="vertical-align: -0.186ex; width: 12.357ex; height: 2.09ex;" src="images/58.svg" alt=" " data-tex="\(1+u^{2}-2u^{4}\)">, <i>read</i> <img style="vertical-align: -0.025ex; width: 4.412ex; height: 1.532ex;" src="images/59.svg" alt=" " data-tex="\(2 m u\)">.</p>
+
+<p><a href="#Page_31">Page 31</a>. Prop. V. Cor. See the note in p. 60.</p>
+
+<p><a href="#Page_33">Page 33</a>. Prop. VIII. By a mistake of a sign, the eighth proposition is rendered
+erroneous; no use having been made of that proposition, it has been inserted without
+proper revision. It ought to stand thus, with its demonstration:</p>
+
+<p><span class="smcap">Proposition</span> VIII. <span class="smcap">Problem</span>.</p>
+
+<p>To find the path of a ray of light falling obliquely on a sphere, of a refractive
+density varying as any power of the distance from the centre.</p>
+
+<p>The refractive density, in the sense of these propositions, varies as the ratio of the
+sines, and as the velocity of light in the medium. (Schol. 2. Prop. I.) Let the velocity
+at the distance <img style="vertical-align: -0.025ex; width: 1.294ex; height: 1.025ex;" src="images/60.svg" alt=" " data-tex="\(x\)"> be <img style="vertical-align: -0.025ex; width: 4.853ex; height: 4.888ex;" src="images/61.svg" alt=" " data-tex="\(x^{-\dfrac{1}{r}}\)">; then, considering the refractive force as a species of
+attraction, we have, in Prop. 41. l. 1. Princip. <img style="vertical-align: -0.186ex; width: 16.305ex; height: 5.049ex;" src="images/62.svg" alt=" " data-tex="\(\sqrt{\text{ABFD}}=x^{-\dfrac{1}{r}}\)">, <img style="vertical-align: -0.439ex; width: 5.868ex; height: 2.032ex;" src="images/63.svg" alt=" " data-tex="\(Q=s\)">, the sine
+of incidence, the radius being unity, <img style="vertical-align: -0.186ex; width: 8.987ex; height: 2.072ex;" src="images/64.svg" alt=" " data-tex="\(\text{Z}=s x^{-1}\)">,
+<img style="vertical-align: -5.475ex; width: 25.942ex; height: 8.005ex;" src="images/65.svg" alt=" " data-tex="\(\text{D}c=\dfrac{s}{2xx\sqrt{x^{-\dfrac{2}{r}}-s^{2}x^{-2}}}\)">
+<img style="vertical-align: -1.552ex; width: 11.23ex; height: 6.415ex;" src="images/66.svg" alt=" " data-tex="\(=\dfrac{1}{2}sx^{\dfrac{1}{r}-2}\)">·<img style="vertical-align: -3.732ex; width: 19.117ex; height: 11.014ex;" src="images/67.svg" alt=" " data-tex="\(\left(1-s^{2}x^{\dfrac{2}{r}-2}\right)^{-\dfrac{1}{2}}\)">,
+and the fluxion of the area described by the radius
+<img style="vertical-align: -1.552ex; width: 14.347ex; height: 6.415ex;" src="images/68.svg" alt=" " data-tex="\(=-\dfrac{1}{2}s x^{\dfrac{1}{r}-2}ẋ\)">·<img style="vertical-align: -3.732ex; width: 19.117ex; height: 11.014ex;" src="images/69.svg" alt=" " data-tex="\(\left( 1-s^{2}x^{\dfrac{2}{r}-2} \right)^{-\dfrac{1}{2}}\)">.
+Let the sine of the inclination to the radius
+<span class="pagenum" id="Page_84">84</span>at each point be called <i>y</i>; then <img style="vertical-align: -0.464ex; width: 10.84ex; height: 5.327ex;" src="images/70.svg" alt=" " data-tex="\(y = s x^{\dfrac{1}{r}-1}\)">,
+<img style="vertical-align: -1.577ex; width: 18.359ex; height: 6.44ex;" src="images/71.svg" alt=" " data-tex="\(ẏ = \dfrac{1-r}{r}s x^{\dfrac{1}{r}-2}ẋ\)">, and the fluxion
+of the area = <img style="vertical-align: -1.738ex; width: 9.03ex; height: 4.267ex;" src="images/72.svg" alt=" " data-tex="\(\dfrac{r}{2r-2}ẏ\cdot\)"><img style="vertical-align: -0.566ex; width: 11.433ex; height: 5.404ex;" src="images/73.svg" alt=" " data-tex="\(\left( 1-yy \right)^{-\dfrac{1}{2}}\)">, of which the fluent is
+<img style="vertical-align: -1.738ex; width: 8.741ex; height: 4.267ex;" src="images/74.svg" alt=" " data-tex="\(\dfrac{r}{2r-2}\text{Y}\)">, y being the sine of the arc Y; and the angle corresponding is
+<img style="vertical-align: -1.738ex; width: 7.61ex; height: 4.267ex;" src="images/75.svg" alt=" " data-tex="\(\dfrac{r}{r-1}\text{Y}\)">. The value of that angle being
+found for any two values of <i>x</i> or <i>y</i>, the difference is the intervening angle described
+by the radius. This angle is therefore always to the difference of the inclinations as
+<img style="vertical-align: -0.025ex; width: 1.02ex; height: 1.025ex;" src="images/76.svg" alt=" " data-tex="\(r\)"> to <img style="vertical-align: -0.186ex; width: 4.917ex; height: 1.692ex;" src="images/77.svg" alt=" " data-tex="\(r-1\)">, and the deviation is to that difference as <img style="vertical-align: 0; width: 1.131ex; height: 1.507ex;" src="images/78.svg" alt=" " data-tex="\(1\)"> to <img style="vertical-align: -0.186ex; width: 4.917ex; height: 1.692ex;" src="images/77.svg" alt=" " data-tex="\(r-1\)">.</p>
+<p>Corollary. Hence, in the passage to the apsis, and the return to the surface, the
+deviation is always proportionate to the arc cut off by the incident ray produced:
+therefore such a sphere could never collect parallel rays to any focus, the lateral density
+being too small towards the surface.</p>
+
+<p><a href="#Page_33">Page 33</a>, line 20, <i>for</i> but the two last &amp;c. <i>read</i> the seventh may either be deduced
+from the eighth, or may be demonstrated independently of it.</p>
+
+<p><a href="#Page_42">Page 42</a>, line 18, <i>after</i> internally, <i>insert</i> Or, if a lens of equal mean dimensions,
+and equal focal length, with the crystalline, be supposed to consist of two
+segments of the external portion of such a sphere, the refractive density at the centre
+of this lens must be as 18 to 17.</p>
+
+<p><a href="#Page_47">Page 47</a>, line 12, <i>for</i> calculated &amp;c. <i>read</i> estimated by means of the eighth
+proposition; and probably.</p>
+
+<p><a href="#Page_53">Page 53</a>, line 24, <i>for</i> 24, <i>read</i> 21; line 25, <i>for</i> 17, <i>read</i> 15.</p>
+
+<p><a href="#Page_61">Page 61</a>, line 21, <i>for</i> sixtieth, <i>read</i> fortieth..</p>
+
+<p><span class="pagenum"><a id="Page_85"></a>85</span></p>
+
+
+<hr class="chap x-ebookmaker-drop">
+<div class="chapter">
+ <h2 class="nobreak" id="EXPLANATION_OF_THE_FIGURES">
+ EXPLANATION OF THE FIGURES.
+ </h2>
+</div>
+
+<div class="explain">
+<figure class="figcenter illowe39_3750" id="Pl.II">
+ <figcaption>
+ <p>Plate II</p>
+ </figcaption>
+ <img class="w100" src="images/072.jpg" alt="">
+</figure>
+
+<p>Plate II. Fig. 1. See <a href="#Page_28">Page 28</a>. Prop. III.</p>
+
+<p>Fig. 2. See Page 28. Prop. IV.</p>
+
+<p>Fig. 3. See <a href="#Page_31">Page 31</a>. Prop. V.</p>
+
+<p>Fig. 4—6. Relating to the optometer. See <a href="#Page_34">Page 34</a>.</p>
+
+<figure class="figcenter illowe39_3750" id="Pl.III">
+ <figcaption>
+ <p>Plate III</p>
+ </figcaption>
+ <img class="w100" src="images/076.jpg" alt="">
+</figure>
+
+<p> Plate III. Fig. 7. The form of the ends of the optometer,
+when made of card. The apertures in the shoulders are for
+holding a lens: the square ends turn under, and are fastened
+together.</p>
+
+<p>Fig. 8. The scale of the optometer. The middle line is
+divided, from the lower end, into inches. The next column
+shows the number of a concave lens requisite for a short-
+sighted eye; by looking through the slider and observing the
+number opposite to which the intersection appears when most
+remote. By observing the place of apparent intersection when
+nearest, the number requisite will be found in the other column,
+provided that the eye have the average power of accommodation.
+At the other end, the middle line is graduated for extending
+the scale of inches by means of a lens four inches in
+focus; the negative numbers implying that such rays as proceed
+from them are made to converge towards a point on the
+other side of the lens. The other column shows the focal length
+of convex glasses required by those eyes to which the intersection
+appears, when nearest, opposite the respective places of
+the numbers.</p>
+
+<p>Fig. 9. A side view of the optometer, half its size.</p>
+
+<p>Fig. 10. The appearance of the lines through the slider.</p>
+
+<p>Fig. 11. Method of measuring the magnitude of an image
+on the retina. See <a href="#Page_48">Page 48</a>.</p>
+
+<p><span class="pagenum" id="Page_86">86</span></p>
+
+<p>Fig. 12. Diagonal scale drawn on a looking-glass.</p>
+
+<p>Fig. 13. The method of applying a lens with water to the
+cornea.</p>
+
+<p>Fig. 14. The appearance of a spectrum occasioned by pressure;
+and the inflection of straight lines seen within the limits
+of the spectrum.</p>
+
+<p>Fig. 15. An illustration of the enlargement of the image,
+which would be the consequence of an elongation of the eye:
+the images of the candles which, in one instance, fall on
+the insertion of the nerve, falling, in the other instance, beyond
+it.</p>
+
+<figure class="figcenter illowe39_3750" id="Pl.IV">
+ <figcaption>
+ <p>Plate IV</p>
+ </figcaption>
+ <img class="w100" src="images/080.jpg" alt="">
+</figure>
+
+<p>Plate IV. Fig. 16. The successive forms of the image of a
+large distant object, as it would be delineated by each refractive
+surface in the eye; to show how that form at last coincides with
+the retina. E&nbsp;G is the distance between the foci of horizontal
+and vertical rays in my eye.</p>
+
+<figure class="figcenter illowe39_3750" id="Pl.V">
+ <figcaption>
+ <p>Plate V</p>
+ </figcaption>
+ <img class="w100" src="images/084.jpg" alt="">
+</figure>
+
+<p>Plate V. Fig. 17. Vertical section of my right eye, seen from
+without; twice the natural size.</p>
+
+<p>Fig. 18. Horizontal section, seen from above.</p>
+
+<p>Fig. 19. Front view of my left eye when the pupil is contracted;
+of the natural size.</p>
+
+<p>Fig. 20. The same view when the pupil is dilated.</p>
+
+<p>Fig. 21. Outline of the eye and its straight muscles when
+at rest.</p>
+
+<p>Fig. 22. Change of figure which would be the consequence
+of the action of those muscles upon the eye, and upon the
+adipose substance behind it.</p>
+
+<p>Fig. 23. Scale of the small optometer.</p>
+
+<p>Fig. 24. Appearance of four images of a line seen by my eye
+when its focus is shortest.</p>
+
+<p><span class="pagenum" id="Page_87">87</span></p>
+
+<p>Fig. 25. Outline of the lens when relaxed; from a comparison
+of M. <span class="smcap">Petit</span>’s measures with the phenomena of my own
+eye, and on the supposition that it is found in a relaxed state
+after death.</p>
+
+<p>Fig. 26. Outline of the lens sufficiently changed to produce
+the shortest focal distance.</p>
+
+<p>Fig. 27. Apparatus for ascertaining the focal length of the
+lens in water.</p>
+
+<figure class="figcenter illowe39_3750" id="Pl.VI">
+ <figcaption>
+ <p>Plate VI</p>
+ </figcaption>
+ <img class="w100" src="images/088.jpg" alt="">
+</figure>
+
+<p>Plate VI. Fig. 28. Various forms of the image depicted by a
+cylindrical pencil of rays obliquely refracted by a spherical surface,
+when received on planes at distances progressively greater.</p>
+
+<p>Fig. 29. Image of a minute lucid object held very near to
+my eye.</p>
+
+<p>Fig. 30. The same appearance when the eye has been
+rubbed.</p>
+
+<p>Fig. 31—37. Different forms of the image of a lucid point
+at greater and greater distances; the most perfect focus being
+like Fig. 33, but much smaller.</p>
+
+<p>Fig. 38. Image of a very remote point seen by my right eye.</p>
+
+<p>Fig. 39. Image of a remote point seen by my left eye; being
+more obtuse at one end, probably from a less obliquity of the
+posterior surface of the crystalline lens.</p>
+
+<p>Fig. 40. Combination of two figures similar to the fifth
+variety of Fig. 28; to imitate Fig. 38.</p>
+
+<p>Fig. 41. Appearance of a distant lucid point when the eye is
+adapted to a very near object.</p>
+
+<p>Fig. 42, 44. Shadow of parallel wires in the image of a
+distant point, when the eye is relaxed.</p>
+
+<p>Fig. 43, 45. The same shadows rendered curved by a
+change in the figure of the crystalline lens.</p>
+
+<p><span class="pagenum" id="Page_88">88</span></p>
+
+<p>Fig. 46. The order of the fibres of the human crystalline.</p>
+
+<p>Fig. 47. The division of the nerves at the ciliary zone; the
+sclerotica being removed. One of the nerves of the uvea is
+seen passing forwards and subdividing. From the calf.</p>
+
+<p>Fig. 48. Ramifications from the margin of the crystalline
+lens.</p>
+
+<p>Fig. 49. The zone of the crystalline faintly seen through the
+capsule.</p>
+
+<p>Fig. 50. The zone raised from its situation, with the ramifications
+passing through it into the lens.</p>
+
+<p>Fig. 51. The zone of the crystalline detached.</p>
+
+<figure class="figcenter illowe36_2500" id="Pl.VII">
+ <figcaption>
+ <p>Plate VII</p>
+ </figcaption>
+ <img class="w100" src="images/092.jpg" alt="">
+</figure>
+
+<p>Plate VII. Fig. 52. The crenated zone, and the globules
+regularly arranged on the crystalline of the partridge.</p>
+
+<p>Fig. 53. The order of the fibres in the lens of birds and
+fishes.</p>
+
+<p>Fig. 54. The segments of the capsule of the crystalline
+turned back, to show the detached ciliary processes. From
+the calf.</p>
+
+<p>Fig. 55. Part of the choroid of the cod-fish, with its red
+substance. The central artery hangs loose from the insertion
+of the nerve.</p>
+
+<p>Fig. 56. The membrane covering this substance internally,
+raised by the blow-pipe.</p>
+
+<p>Fig. 57. The appearance of the red substance, after the
+removal of the membrane.</p>
+</div>
+
+<h3>FOOTNOTES:</h3>
+<div class="footnotes">
+
+<div class="footnote"><p><a id="Footnote_1_1" href="#FNanchor_1_1" class="label">1</a>
+Phil. Trans. for 1793, p. 169.</p></div>
+
+<div class="footnote"><p><a id="Footnote_2_2" href="#FNanchor_2_2" class="label">2</a>
+Phil. Trans. for 1794, p. 21.</p></div>
+
+<div class="footnote"><p><a id="Footnote_3_3" href="#FNanchor_3_3" class="label">3</a>
+Phil. Trans. for 1795, p. 1.</p></div>
+
+<div class="footnote"><p><a id="Footnote_4_4" href="#FNanchor_4_4" class="label">4</a>
+De Corporis humani Viribus conservatricibus, p. 68.</p></div>
+
+<div class="footnote"><p><a id="Footnote_5_5" href="#FNanchor_5_5" class="label">5</a>
+Phil. Trans. for 1800, p. 146.</p></div>
+
+<div class="footnote"><p><a id="Footnote_6_6" href="#FNanchor_6_6" class="label">6</a>
+Edinb. Med. Essays, Vol. IV. p. 124.</p></div>
+
+<div class="footnote"><p><a id="Footnote_7_7" href="#FNanchor_7_7" class="label">7</a>
+Edinb. Med. Ess. Vol. IV. p. 185.</p></div>
+
+<div class="footnote"><p><a id="Footnote_8_8" href="#FNanchor_8_8" class="label">8</a>
+Mem. de I’Acad. de Paris, 1730. p. 6. Ed. Amst.</p></div>
+
+<div class="footnote"><p><a id="Footnote_9_9" href="#FNanchor_9_9" class="label">9</a>
+Phil. Trans, for 1793. p. 174.</p></div>
+
+<div class="footnote"><p><a id="Footnote_10_10" href="#FNanchor_10_10" class="label">10</a>
+Comm. Petrop. I. p. 314.</p></div>
+
+<div class="footnote"><p><a id="Footnote_11_11" href="#FNanchor_11_11" class="label">11</a>
+<span class="smcap">Petit</span> Mem. del’Acad. 1725, p. 20.</p></div>
+
+<div class="footnote"><p><a id="Footnote_12_12" href="#FNanchor_12_12" class="label">12</a>
+Phil.Trans. for 1795, p. 2.</p></div>
+
+<div class="footnote"><p><a id="Footnote_13_13" href="#FNanchor_13_13" class="label">13</a>
+<span class="smcap">Smith</span>, e. 96.</p></div>
+
+<div class="footnote"><p><a id="Footnote_14_14" href="#FNanchor_14_14" class="label">14</a>
+Phil. Trans, for 1796, p. 2.</p></div>
+
+<div class="footnote"><p><a id="Footnote_15_15" href="#FNanchor_15_15" class="label">15</a>
+Phil. Trans, for 1795, p. 13.</p></div>
+
+<div class="footnote"><p><a id="Footnote_16_16" href="#FNanchor_16_16" class="label">16</a>
+De Oculi Mutationibus internis. Gotting. 1780. 4°.</p></div>
+
+<div class="footnote"><p><a id="Footnote_17_17" href="#FNanchor_17_17" class="label">17</a>
+This Corollary should stand thus. “If a confused image be received on any
+given plane, it will be necessary, in order to determine its magnitude, to advert to the
+aperture admitting the rays. If the aperture be supposed to be infinitely small, it may
+be considered as a radiant point, in order to find the direction of the emergent rays.”</p></div>
+
+<div class="footnote"><p><a id="Footnote_18_18" href="#FNanchor_18_18" class="label">18</a>
+Phil. Trans, for 1794. p. 212.</p></div>
+
+<div class="footnote"><p><a id="Footnote_19_19" href="#FNanchor_19_19" class="label">19</a>
+Phil. Trans, for 1795. p. 9.</p></div>
+
+<div class="footnote"><p><a id="Footnote_20_20" href="#FNanchor_20_20" class="label">20</a>
+Phil. Trans, for 1795. p. 8.</p></div>
+
+<div class="footnote"><p><a id="Footnote_21_21" href="#FNanchor_21_21" class="label">21</a>
+De Facultate Oculi qua ad diversas Rerum distantias se accommodat. L. B. 1719.
+Ap. Hall. Disp. Anat. IV. p. 301.</p></div>
+
+<div class="footnote"><p><a id="Footnote_22_22" href="#FNanchor_22_22" class="label">22</a>
+De quibusdam Oculi Partibus, L. B. 1746. Ap. Hall. Disp. Anat. IV. p. 301.</p></div>
+
+<div class="footnote"><p><a id="Footnote_23_23" href="#FNanchor_23_23" class="label">23</a>
+De Oculo Humano. L. B. 1742. Ap. Hall. Disp. Anat. VII. 2. p. 108, 109.</p></div>
+
+<div class="footnote"><p><a id="Footnote_24_24" href="#FNanchor_24_24" class="label">24</a>
+1794. p. 352, 354.</p></div>
+
+<div class="footnote"><p><a id="Footnote_25_25" href="#FNanchor_25_25" class="label">25</a>
+De Corp. Hum. Vir. Cons, p. 68.</p></div>
+
+<div class="footnote"><p><a id="Footnote_26_26" href="#FNanchor_26_26" class="label">26</a>
+Vid. Hall. Physiol. V. p. 432. et <span class="smcap">Duverney</span>, ibi citat.</p></div>
+
+<div class="footnote"><p><a id="Footnote_27_27" href="#FNanchor_27_27" class="label">27</a>
+Phil. Trans, for 1796. p. 18.</p></div>
+
+<div class="footnote"><p><a id="Footnote_28_28" href="#FNanchor_28_28" class="label">28</a>
+Phil. Trans. Vol. XXXIII. p. 223. Abr. Vol. VII. p. 435.</p></div>
+
+<div class="footnote"><p><a id="Footnote_29_29" href="#FNanchor_29_29" class="label">29</a>
+Phil. Trans. Vol. XXXIV. p. 113. Abr. Vol. VII. p. 437.</p></div>
+
+<div class="footnote"><p><a id="Footnote_30_30" href="#FNanchor_30_30" class="label">30</a>
+Mem. del’Acad. 1735. p. 163. 1736, p. 166. Ed. Amst.</p></div>
+
+<div class="footnote"><p><a id="Footnote_31_31" href="#FNanchor_31_31" class="label">31</a>
+Phil. Trans. for 1795. p. 263.</p></div>
+
+<div class="footnote"><p><a id="Footnote_32_32" href="#FNanchor_32_32" class="label">32</a>
+Phil. Trans. for 1796. p. 14.</p></div>
+
+<div class="footnote"><p><a id="Footnote_33_33" href="#FNanchor_33_33" class="label">33</a>
+Phil. Trans. Vol. XXII. p. 673. Abr. II. p. 762.</p></div>
+
+<div class="footnote"><p><a id="Footnote_34_34" href="#FNanchor_34_34" class="label">34</a>
+Phil. Trans. for 1793. p. 178.</p></div>
+</div>
+<div style='text-align:center'>*** END OF THE PROJECT GUTENBERG EBOOK 79069 ***</div>
+</body>
+</html>
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