E F 



Plate VI. — Plasmodium vivax, the tertian ague parasite. — 

 From Muir and Ritchie. 



, Several young ring-shaped amcebula^ within the red corpuscles, one of the latter 

 enlarged and showing a dotted appearance ; B, a larger amcebula, containing 

 pigment granules ; C, two large amoebulse, exemplifying the great variation in 

 form; D, large amcebula assuming the spherical form and showing isolated 

 fragments of chromatin, preparatory to schizogony ; E, schizont which has pro- 

 duced eighteen schizozoites (merozoites), each of which contains a small collec- 

 tion of chromatin ; E, merozoites set free, (x iooo.) 



