Human and comparative anatomy, physiology, and hygiene . more useful and adds moreto our happiness than vision, or sight. The organs fromwhich we receive so much pleasure are the eyes. THE EYES* 187. The eye is composed of many parts — as thecoats, humors, musdes, &c. () Q. Of what is the eye composed ? 188. The coats are three in number — the corrie-a andscle-rotic, the choroid, and the rcti-na. (Fig. 62.) Q. How many coats has the eye 1 What are they? * Illustrate this lesson by using the eyes of animals, diagrams, andthe blackboard. 82 ANATOMY, PHYSIOLOGY, AXD HYGIENE. 189. The corne
Human and comparative anatomy, physiology, and hygiene . more useful and adds moreto our happiness than vision, or sight. The organs fromwhich we receive so much pleasure are the eyes. THE EYES* 187. The eye is composed of many parts — as thecoats, humors, musdes, &c. () Q. Of what is the eye composed ? 188. The coats are three in number — the corrie-a andscle-rotic, the choroid, and the rcti-na. (Fig. 62.) Q. How many coats has the eye 1 What are they? * Illustrate this lesson by using the eyes of animals, diagrams, andthe blackboard. 82 ANATOMY, PHYSIOLOGY, AXD HYGIENE. 189. The cornea is the outer front part of the health, this coat is covered with a fluid that gives theeye its sparkling brilliancy. (Fig. 62.) Q. Describe the cornea. With what is it covered 1 190. The sclerotic is the external and principalcoat. It gives form to the eye. It is sometimes calledthe white of the eye, from its chalky appearance.(Fig. 62.) Q. Describe the sclerotic coat. What gives form to the eye ?What is it sometimes called ? Fijr. Fig. 62. A section of the globe of the eye. 1. The sclerotic The cornea. (This connects with the sclerotic coat by a bevellededge.) 3. The choroid coat. 6, 6. The iris. 7. The pupil. 8. Theretina. 10, 11, 11. Chambers of the eye that contain the aqueous hu-mor. 12. The crystalline lens. 13. The vitreous humor. 15. The op-tic nerve. 16. The central artery of the eye. Remark. — In the shark, that lives at great depths inthe ocean, the sclerotic coat is bone. This provision isto resist the great pressure, of the water. Q. What is said of the eye of the shark 1 191. The choroid coat is very thin, fit is a net of THE EYES. 83 blood vessels. Its inner surface is dark colored. (Fi°-62.) ^ ° Q. Describe the choroid coat. Remark. — In the cat this coat is light colored, whichgives a wild and yellow glare to pussys eyes when seenin the dark. Q. What causes the wild appearance of the eye of a cat inthe dark ? 192. The retina is t
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