Elements of animal physiology, chiefly human . VVniite Corpuscle Tied Corpuscle Fi; 38. Red Corpuscles of Human Bloodarranged in Rouleaux. Magnified about 600 diameters. puscles are horn, and 20,000,000 of themor with each beat of the heart. 158. Under the microscope these little bodies may beseen rolling and turning about in the liqiwr sanguinis,and arranging themselves in little piles, or rouleaux—\\^qpiles of small coin seen edgewise. When they ahsorhoxygen they become flattened, their avails becomincrthicker and more opaque, and possibly more reflective! THE STRUCTURE OF A RED CORPUSCLE. 7
Elements of animal physiology, chiefly human . VVniite Corpuscle Tied Corpuscle Fi; 38. Red Corpuscles of Human Bloodarranged in Rouleaux. Magnified about 600 diameters. puscles are horn, and 20,000,000 of themor with each beat of the heart. 158. Under the microscope these little bodies may beseen rolling and turning about in the liqiwr sanguinis,and arranging themselves in little piles, or rouleaux—\\^qpiles of small coin seen edgewise. When they ahsorhoxygen they become flattened, their avails becomincrthicker and more opaque, and possibly more reflective! THE STRUCTURE OF A RED CORPUSCLE. 79 When they absorb carbonic acid gas the cells are saidto become rounder and larger, and their walls thinner,more transparent, and darker. 159. The Form and Size of the Red Corpuscles variesin different animals. They are circular and biconcavein nearly all the mammalia, being smallest in the deertribe,—are oval in birds, reptiles, and fishes, beinglargest in the reptileF. The following diagram (fig. 39). Fig 39. Shapes of Blood Corpuscles (red) of Various Animals,gives their shape, also their longest diameters in fractionsof an inch. 160. The Structure of a Red Corpuscle is not even yetpositively determined. It is usually described as consist-ing of an interior semi-fluid, or even quite fluid substance,siirrounded by an outer substance of gradually increasingdensity, forming a not very definite or distinctly markedcell wall. Some physiologists still desciibe the redcorpuscle as a homogeneous structureless mass, 80 ANIMAL PHYSIOLOGY. 161. The interior substance of the corpuscle consistsof hxmoglohin, or as it is sometimes variously termedcruor, or cruoro-glohulin, or hcemato-glohulin. This com-pound may be resolved into two substances:—hcematine,the peculiar colouring substance of the blood, and analbuminous substance termed globulin. Prepare a second glass slide (as described in section154), but previous to covering the blood up with thethin covering glass, dilute with wa
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