Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 131
laced beyond 2 F. The human eye is about an inch in diameter and hasthree coats. The outer coat is very thick and strong, andis called the sclerotic coat. (Figure 106.) This sclerotic coatcovers the entire eyeball, but at the front it is transparentand this portion has the name cornea (C). The next… … Figure 106.— 1 he Eye. the eye. At the back of the eye is a third coat (R) called the retina. This is nervous tissue composed of millions of small nerve cells.These cells are dividedinto three classes. Inone class are thoseaffected by red light;in another class arethose affected by greenlight; and…
Physics
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