Elementary anatomy and physiology : for colleges, academies, and other schools . elementaryanato00hitc Year: 1869 232 HITCHCOCK'S ANATOMY true of ruminants. The largest animals, such as the elephant, have very small corpuscles. In some of the camels and llamas the corpuscles are large and somewhat elongated. The same is true of the dromedary. Crystalline substances are found in the blood of other mammals as -well as man. The an- nexed cut shows crystals from the blood of the Guinea pig. The distribution ot the arteries of quadru- peds is a subject of con- siderable interest. In grazing animal
Elementary anatomy and physiology : for colleges, academies, and other schools . elementaryanato00hitc Year: 1869 232 HITCHCOCK'S ANATOMY true of ruminants. The largest animals, such as the elephant, have very small corpuscles. In some of the camels and llamas the corpuscles are large and somewhat elongated. The same is true of the dromedary. Crystalline substances are found in the blood of other mammals as -well as man. The an- nexed cut shows crystals from the blood of the Guinea pig. The distribution ot the arteries of quadru- peds is a subject of con- siderable interest. In grazing animals, which hold their heads low, in addition to large arterial trunks, we find a great number of very small ones, which are exceedingly tortuous in their course, called ' Wonder Nets.' This arrangement is to prevent a too rapid flow of blood to the head by the force of gravity, which would of necessity take place when the head is so constantly in a dependent position. A similar disposition is seen in the limbs of the sloth and other animals which are like them in tardiness of movement. In the fore-leg of the lion, where great muscular force is exerted, the main artery passes through a perforation in the bone, so as to secure it from obstruction to the flow of blood by pressure of the rigid muscles. 413. Heart of Birds.—The heart of birds is highly mus- cular and of very large size in proportion to the bulk of the body, and in general structure resembles the same organ in mammals. The valves of the right ventricles, however, are supplied with a strong band of muscular fibers, which gives 412. What is peculiar about the blood discs or corpuscles of the larger animals? What is the form of nearly all of them ? In what animals ar e they oval ? What are Wonder Nets, and why are they introduced ? 413. What is worthy of note with refer- ence to the heart of birds ? FlG. 230. Blood Crystals of the Guinea Pig.
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