. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 472 PHYSIOLOGY OF THE DOMESTIC ANIMALS. In man and all mammalia, with the exception of the camel tribe, they are circular and devoid of a nucleus; in birds, reptiles, and most fish, they are oval, biconvex, and nucleated; in the camel, the red blood-cells are oval, but are not nucleated. From the fact that the edo-es of the red blood-cells are convex and the centre concave, these different parts refract light differently, and when examined under the microscope, if the edges are sharply defined, the centres
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 472 PHYSIOLOGY OF THE DOMESTIC ANIMALS. In man and all mammalia, with the exception of the camel tribe, they are circular and devoid of a nucleus; in birds, reptiles, and most fish, they are oval, biconvex, and nucleated; in the camel, the red blood-cells are oval, but are not nucleated. From the fact that the edo-es of the red blood-cells are convex and the centre concave, these different parts refract light differently, and when examined under the microscope, if the edges are sharply defined, the centres appear dark, and vice versa (Fig. 172). There is no constant relation between the size of an animal and the size of its blood-disks ; thus, among mammals, although the red blood- corpuscles of the elephant are the largest, those of the mouse are by no means the smallest, being, in fact, three times as large as those of the musk-deer (Fig. 173). A B. Fig. 172.—Red Blood-Corpuscles. (Landois.) A human red blood-corpuscles: 1, seen on the flat; 2, on edge ; 3, rouleaux of colored corpuscles slightly separated. B, colored amphibian blood-corpuscles: 1, seen on the flat, and, 2, on edge. C, ideal transverse section of a human red blood-corpuscle magnified five thousand times linear: ab, diameter; In the various domestic animals their diameter is placed as follows in fractions of a millimeter : horse, ; ox, ; dog, ; sheep, ; goat, ; hog, milli- meters. Frequently, particularly in growing animals and after profuse hemorrhage or exhausting disease, red blood-corpuscles smaller than the above will be found. These are probably to be regarded as young, grow- ing blood-cells. The number of the red blood-cells is almost infinite; in one cubic centimeter of blood in man, five million red blood-disks have been estimated to be present; in the goat, nine to ten millions ; in the lamb, thirteen to fourteen millions; in birds, one
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