Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . e-dium at A, is refracted to c, instead of pursuing its original course toiZ; when it passes intoa rarer medium again at c, it is again refracted in a new course down to d, instead of/. Figure 8. The Lenses.—a, Single convex lens, b, Single concave lens, c, Double convex lens, d, Double concave lens, e, Concavo couvex lens. Figure 9. Short-sightedness—The image formed in front of the retina. Figure 10.
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . e-dium at A, is refracted to c, instead of pursuing its original course toiZ; when it passes intoa rarer medium again at c, it is again refracted in a new course down to d, instead of/. Figure 8. The Lenses.—a, Single convex lens, b, Single concave lens, c, Double convex lens, d, Double concave lens, e, Concavo couvex lens. Figure 9. Short-sightedness—The image formed in front of the retina. Figure 10. Long-sightedness—The image formed back of the retina. Figure 11. Eye of a Lynx.—a, Ciliary process, by which the lens, b, is moved backward and forward, to adapt it to different distances. Figure 12. Eye of an Eagle.—a, Fan-like muscle, attached to the lens, to change its position. Figure 13. Eye of an Owl, surrounded by a kind of bony case, which causes tho anterior portion of the eye to become more, and the posterior portion less convex, when-ever tho eye i-< drawn back into the socket. By this means the focal distance is changed,and mo eye adapted to different
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
