. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 164 ANIMAL PHYSIOLOGY. of conditions has been too great. Deficiency in the quantity of the hlood as a whole {oligcemia) causes serious change in the functions of the body; but that a haemorrhage of considerable extent can be so quickly recovered from by many persons, speaks much for the recuperative power of the blood-forming tissues. Various kinds of disturbances in these blood-forming organs result in either deficiency or excess of the blood-cell
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 164 ANIMAL PHYSIOLOGY. of conditions has been too great. Deficiency in the quantity of the hlood as a whole {oligcemia) causes serious change in the functions of the body; but that a haemorrhage of considerable extent can be so quickly recovered from by many persons, speaks much for the recuperative power of the blood-forming tissues. Various kinds of disturbances in these blood-forming organs result in either deficiency or excess of the blood-cells, and in some cases the appearance of unusual forms of corpuscles. AncB,mia may arise from a deficiency either in the numbers or the quality of the red cells ; they may be too few, deficient. FiQ. 157. Fig. 153.—Outlines of red corpuscles in a case of profound anaamia. 1, 1, normal corpuscles ; 2, large red corpuscle—megalocyte ; 3, 3, very irregular forms—poikilocytes; 4, very small, deep-red corpuscles—microcytes. Fig. 154.—Origin of microcytes from red corpuscles by process of budding and fission. Speci- men from red marrow. Fig. 155.—Nucleated red blood-corpuscles from blood in case of leukaemia. Fig. 156.—Corpuscles containing red blood-corpuscles. 1, from blood of child at term; 3, from blood of a leukgemic patient. Fig. 157.—tt, 1, 2, 3, spleen-cells containing red blood-corpuscles. 5, from marrow ; 1, cell con- taining nine red corpuscles : 3, cell with reddish granular pigment; 3, fusiform cell con- taining a single red corpuscle, c, connective-tissue corpuscle from subcutaneous tissue of young rat, showing the intracellular development of red blood-corpuscles. (Figs. 153-157, after Osier.) in size, or lacking in the normal quantity of haemoglobin. In one form (pernicious ancemia), which often proves fatal, a variety of forms of the red blood-cells may appear in the blood- stream ; some may be very small, some larger than usual, others. Please note tha
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