. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 100 COMPARATIVE ZOOLOGY. or angular, in Fishes ; oval in Reptiles, Bii-ds, and the Camel tribe ; and circular in the rest of Mammals. They are double-convex when oval, and double-concave when circular. 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 bii'ds, 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 whi
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 100 COMPARATIVE ZOOLOGY. or angular, in Fishes ; oval in Reptiles, Bii-ds, and the Camel tribe ; and circular in the rest of Mammals. They are double-convex when oval, and double-concave when circular. 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 bii'ds, 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 more abundant in venous than ar- terial blood, in the sickly and ill-fed than in the healthy and vigorous, in the lower Vertebrates than in Birds and Mammals. There is less blood in cold-blooded than in warm-blood- ed animals; and the larger the animal, the greater is the. Fig. eS.—Capillniy Circulation in the Web of a Froi,''s Foot, X \m: a, b, small veins ; d, capillaries iu which the oval corpnt^cles are seen t(t follow one another in sin- gle series; c, pigmeut-cells iu the 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 Orton, James, 1830-1877. New York, Harper and brothers
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