. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 348 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. take ten million to cover a square inch; but on account of their flatness it would take more than twelve thou- sand to make a pile an inch high. Thus a cubic inch of blood globules would contain one hundred and twenty thousand million globules. Now it has been estimated that the actual number in a cubic inch of blood is about seventy thousand millions. Therefore considerably more than half of the blood consists of these globules. Behavior
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 348 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. take ten million to cover a square inch; but on account of their flatness it would take more than twelve thou- sand to make a pile an inch high. Thus a cubic inch of blood globules would contain one hundred and twenty thousand million globules. Now it has been estimated that the actual number in a cubic inch of blood is about seventy thousand millions. Therefore considerably more than half of the blood consists of these globules. Behavior of Blood.—If we watch fresh-drawn blood with a microscope under a glass cover we observe that the disks run together and pile on one another like a pile of coins thrown down (Fig. 235). This is the re- sult of coagulation. If a little water on the finger is touched to the side of the cover, so as to be drawn in and mingled with the blood, then the globules become round like mar- bles, and roll around freely in the current. They have imbibed the water and be- come swollen. If the fluid in which they float should dry away ever so little, they shrivel and become irregular in shape (Fig. 235 /-'). The same change takes place if a strong solution of salt be added. The salt draws water out of the globules and shrivels them. But if a iveak solution of salt be added it prevents coagu- lation, and at the same time does not alter the shape. The disklike shape may be thus examined at leisure. Structure.—The red globules are not cells, but solid masses, a little softer in the Fig. 235.—Blood globules : rr r, red globules; I /, white globules or 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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