File:Comparative zoology, structural and systematic - for use in schools and colleges (1883) (20670817635).jpg

Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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100 COMPARATIVE ZOOLOGY. ular, or sac-like, in all animals; but they are constantly changing. The form of the red disks is more permanent, although they are soft and elastic, so that they squeeze MAN ⢠I I. 3200 ELEPHANT' ⢠1.274 5 MOUSE ⢠1.4268 MUSK DEER 112325 HUMMING BIRD 1.2666 SNAKE 1 â PIGEON ^^^^ f.2314 OTEUS ^^MHHI
Text Appearing After Image:
Fig. 65.âComparative Size and Shape of the red Corpuscles of various Animals. through very narrow passages. They are oval, circular, or angular, in Fishes; oval in Reptiles, Birds, and the Camel tribe ; and circular in the rest of Mammals. They are double-convex when nucleated, and double-concave when circular and not nucleated. Blood is always heavier than water; but is thinner in cold-blooded than in warm-blooded animals, in herbivores than in carnivores. The blood of Birds, which is the hot- test known, being 10° higher than Man's, is richest in red corpuscles. In Man, they constitute about one half the mass of blood. The white globules are far less numerous than the red; they are relatively more abundant in venous than arterial blood, in the sickly and ill-fed than in the healthy and vigorous, in the lower Vertebrates than in Birds and Mammals. Their number is subject to great

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