The malarial fevers, haemoglobinuric fever and the blood protozoa of man . eautifully regular arrangement of the merozoiteswould alone serve to distinguish this stage of the quartan from the corres-ponding stage of the tertian plasmodium, but the quartan merozoites are alsomore oval in shape, more refractile and somewhat larger, measuring about in diameter (see Fig. 8). When segmentation is complete each merozoite becomes free in the bloodplasma and, in the human cycle, again invades the red corpuscles, somebecoming sckizonts, while others become gametes. At the time of sporulation
The malarial fevers, haemoglobinuric fever and the blood protozoa of man . eautifully regular arrangement of the merozoiteswould alone serve to distinguish this stage of the quartan from the corres-ponding stage of the tertian plasmodium, but the quartan merozoites are alsomore oval in shape, more refractile and somewhat larger, measuring about in diameter (see Fig. 8). When segmentation is complete each merozoite becomes free in the bloodplasma and, in the human cycle, again invades the red corpuscles, somebecoming sckizonts, while others become gametes. At the time of sporulation the pigment and the residual protoplasmcontaining it is liberated and most of it is engulfed by phagocytic leucocytes, THE ETIOLOGY OF THE MALARIAL FEVERS. 29 some of the pigment, however, remaining free in the blood for a considerabletime. There is a slight difference in size between individual sporulating bodies,even in the same individual, and rarely sporulation may be observed in plasmodiathat do not occupy more than two-thirds of the red corpuscle, but as a general. Fig. 6.—Plasmodium malarias. (Quartan plasmodium.) Presegmentingparasite. Photomicrograph, X 1200. rule there is not as much variation in the size of the sporulating forms ofPlasmodium malariae as there is in the same forms of Plasmodium star-like arrangement of the pigment between the segments, which Thayerconsiders so characteristic, is generally observed, but I have observed exactly
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