. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. TUB ENGLISH SPABBOIV 389 The nervous system consists of the brain, spinal cord, and the sympathetic system. The brain shows a great advance over reptiles, particularly in the development of the hind brain, or cerebellum—the centre of coordination (Fig. 356). Since flight demands extreme coordination, we can under- stand the large cerebellum of /7Cf Fig. 357. — Median section through the eye of the pigeon : en, cornea; ir, iris; I, lens; cLjir, lens muscles; pet, pecten; , optic nerve; rt, reti
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. TUB ENGLISH SPABBOIV 389 The nervous system consists of the brain, spinal cord, and the sympathetic system. The brain shows a great advance over reptiles, particularly in the development of the hind brain, or cerebellum—the centre of coordination (Fig. 356). Since flight demands extreme coordination, we can under- stand the large cerebellum of /7Cf Fig. 357. — Median section through the eye of the pigeon : en, cornea; ir, iris; I, lens; cLjir, lens muscles; pet, pecten; , optic nerve; rt, retina; eh, choroid coat; scl, sclerotic coat. After Vogt and Yung, from Parker and Haswell's "; Sense-organs. — As befits such active animals, pigeons, like birds in general, have well-developed sense-organs. Organs of smell, lying at the base of the beak, and those of hearing, having much the same structure as in man, are present. But the most perfect organ is the eye which has relatively a large size. It differs from that of man in its lenticular (compressed) form, well adapted to the vision of distant objects. A peculiar organ. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
