. Loi cosmique ; l'immortalité de l'âme et l'existence de Dieu. Byappropriate , et transmis à nerveuses à l'anneau musculaire ou de l'iris, qui, par son action, peut soit augmenter ou contrat de l'élève. Il isfurther, également, dans le sujet humain à observer, qu'thishole dans l'oeil, que nous appelons l'élève, au titre de l'ensemble de ses differentdimensions exact, conserve sa forme circulaire. C'est une structure très artificielle. Laisser un artiste seulement essayer d'exécuter l'oeil gg la même ; il verra que son fils et cordes doivent mises au rebut avec beaucoup de considération et de ruse pour faire acircle qui sh

• Contributeur: The Reading Room / Alamy Banque D'Images
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. Cosmic law; the immortality of the soul and the existence of God. , and conveyed byappropriate nerve-fibres to the muscular ring or iris, which, by its action, can either contract or expand the pupil. It isfurther, also, in the human subject to be observed, that thishole in the eye, which we call the pupil, under all its differentdimensions, retains its exact circular shape. This is a struc-ture extremely artificial. Let an artist only try to execute THE EYE gg the same; he will find that his threads and strings must bedisposed with great consideration and contrivance to make acircle which shall continually change its diameter, yet pre-serve its form. This is done in the eye by an application offibres, i. e., of contractile strings, similar in their position andaction to what an artist would endeavor to procure, and mustemploy if he had the same piece of workmanship to perform.II. The second difficulty which has been stated was thesuiting of the same organ to the perception of objects thatlie near at hand, within a few inches, we will suppose, of the. Fig. 3. Front view of the eye showing the pupil and the regulatingfibres around it. eye, and of objects which are placed at a considerable dis-tance from it, that, for example, of as many furlongs (Ispeak in both cases of the distance at which distinct visioncan be exercised). Now this, according to the principles ofoptics, that is, according to the laws by which the transmis-sion of light is regulated (and these laws are fixed), could notbe done without the organ itself undergoing an alteration, and receiving an adjustment, that might correspond with the 70 THE EYE exigency of the ease, that is to say, with the different inclina-tion to one another under which the rays of light reached it.Eays issuing from points placed at a small distance from theeye, and which consequently must enter the eye in a spread-ing or diverging order, cannot, by the same optical instru-ment in the same state, be brought to a point, i. e., b

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