. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. THE BLOOD OF ANIJNIALS. 99 All blood-corpuscles are microscopic. The white are more uniform in size than the red; and generally smaller (except in Mammals), being about -^^Vo of an inch in di- ameter. The red corpuscles are largest in Reptiles (those of the amphibious Proteus being the extreme, or ^^ of an inch), next in Fishes, then Birds and Mannnals. The smallest known are those of the Musk-deer. In Mammals, the size agrees with the size of the animal only within a natural order; but in Birds the cor
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. THE BLOOD OF ANIJNIALS. 99 All blood-corpuscles are microscopic. The white are more uniform in size than the red; and generally smaller (except in Mammals), being about -^^Vo of an inch in di- ameter. The red corpuscles are largest in Reptiles (those of the amphibious Proteus being the extreme, or ^^ of an inch), next in Fishes, then Birds and Mannnals. The smallest known are those of the Musk-deer. In Mammals, the size agrees with the size of the animal only within a natural order; but in Birds the correspondence holds good throughout the class, the largest being found in the Os- trich, and the smallest in the Humming-bird. In Man, they measure t^jto of an inch, so that it would take 40,000 to cover the head of a pin. As to shape, the colorless corpuscles are oi'dinarily glob- ular, or sac-like, in all animals ; but they are constantly changing. The form of tlie red disks is more permanent, although they ai-e soft and elastic, so that they squeeze through very narrow passages. They are oval, circular,. Fig. 64—Compai-ative Size and Shape of the red Coipuscles of various Animals,. 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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