Elements of animal physiology, chiefly human . da of the blood, thus differing chemically from thecorpuscles, which contain most of the fatty substances,and the phosphates; all the iron, and most of the potash. 157. The Red Corpuscles of human blood consist of ex-ceedingly minute, soft, flexible, elastic, pale yellowish, cir-cular, biconcave, non-nucleated discs, with rounded edges. Their diameters vary from about the to the Their thickness is about \ to \ of their Red Corpuscles, .^QQQ of an inch. diameter, and therefore varies from about the ^^^^^^^^ to the -9^0 of an inch. It has been rough
Elements of animal physiology, chiefly human . da of the blood, thus differing chemically from thecorpuscles, which contain most of the fatty substances,and the phosphates; all the iron, and most of the potash. 157. The Red Corpuscles of human blood consist of ex-ceedingly minute, soft, flexible, elastic, pale yellowish, cir-cular, biconcave, non-nucleated discs, with rounded edges. Their diameters vary from about the to the Their thickness is about \ to \ of their Red Corpuscles, .^QQQ of an inch. diameter, and therefore varies from about the ^^^^^^^^ to the -9^0 of an inch. It has been roughly calculated that 10,000,000 red corpuscles would lay on one square inch of surface, and that 120,000,000,000 might be contained within the volume of one cubic inch. It has also been estimated that one cubic inch of freshly drawnhealthy humanrjblood actuallycontains84,000,000 of rec?corpuscles, and240,000 white orcolourless corpus-cles. Dr. Draper,the celebratedAmerican physi-ologist, has esti-mated that20,000,000 ofthese red cor-per second,. 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 diagra
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