MALARIA IN MAN'S BLOOD 



97 



characteristic of malaria, and the body of the Plas- 

 modium appears dotted with granules of melanin. 

 The organism, after attaining its full growth, begins 

 to divide (Fig. 23, C, D), and rosettes of smaller 

 parasites the merozoites are formed (Fig. 23, E). 



FIG. 23 STAGES OF PLASMODIUM VIVAX IN THE BLOOD 



A, Young parasite within red blood-corpuscle, ring form ; B, older 

 amoeboid trophozoite, with dark pigment masses, corpuscle 

 slightly enlarged ; C, a young schizont ; D, older schizont ; 

 E, rosette of merozoites within the blood-corpuscle ; F, part of 

 a rosette of merozoites, surrounding the residual unused part 

 of the schizont, which contains waste material (the merozoites 

 have been liberated by the bursting of a corpuscle) ; p., pigment 



When this stage is reached the enfeebled blood- 

 corpuscle can resist no longer ; it disintegrates, and 

 the merozoites are set free into the blood-stream 

 (Fig. 23, F). They soon enter hitherto uninfected 

 blood-corpuscles, where they develop into tropho- 

 ^oites and then become schizonts, that repeat the 

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