The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . very minute, averaging only -g-^Vo ^^ ^^ inch indiameter, and are flattened in their shape. Theymay be described as looking like a cylindrical ring,the center of which has been filled up, but not quiteto the level of the border, so that there is a slightdepression on each flattened side. Taken singly, * Prick the end of the finger wi
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . very minute, averaging only -g-^Vo ^^ ^^ inch indiameter, and are flattened in their shape. Theymay be described as looking like a cylindrical ring,the center of which has been filled up, but not quiteto the level of the border, so that there is a slightdepression on each flattened side. Taken singly, * Prick the end of the finger with a pin. The most minute dropof blood is sufficient. Put it on a glass slide under a thin glass cover,and place it under a microscope. THE BLOOD. 113 these bodies, called the red blood-corpuscles, are of alight amber color, but in a large mass they give the characteristic red col-or to the blood. They varysomewhat in size in differ-ent animals, those of themonkey approaching mostnearly to those of the hu-man being. In birds, rep-tiles, and fish, they arevery much larger, and in-stead of being circular areoval (Fig. 35).* They alsohave a distinct is mainly by these microscopical differences thatthe blood of different animals can be distinguished. Fig. 33.—Human blood-corpuscles,including two white ones.
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