The book A Treatise On Human Physiology was written by author Dalton, John Call, 1825-1889 Here you can read free online of A Treatise On Human Physiology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Human Physiology a good or bad book?
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Thus, they ard large in fish, reptiles, and birds, in which the eyeball is for th«f most part very large in proportion to the entire head; and are small in quadrupeds and in man, where the eyeball is, comparatively, speaking, of insignificant siae. Direct experiment also shows tha close connection between the tubercula quadrigemina and the sense of sight. Section of the optic nerve at any point between the retina and the tubercles, produces complete blindness ; and destruc- tion of the tubercle...s themselves has the same effect. But if the division be made between the tubercles and the cerebrum, or if the cerebrum itself be taken away while the tubercles are left un- touched, vision, as we have already seen, still remains. It is the tubercles, therefore, in which the impression of light is perceived. So long as these ganglia are iminjured and retain their connection with the eye, vision. remains. As soon as this connection is cut off) or the ganglia themselves are injured, the power of vision is destroyed.
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