PLATE II. 





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Figs, i, 2, and 3 show three phases of the parasite of tertian fever. 

 Fig. i, ring form, showing beginning pigment formation. Fig. 2, full- 

 grown parasite. Fig. 3, segmenting bodies. (WELCH and THAYER.) 



Figs. 4, 5, and 6 show the parasite of quartan fever at different stages 

 of growth. Fig. 4, moderately developed intracorpuscular parasite. Fig. 5, 

 large swollen extracorpuscular form. Fig. 6, flagellate body. 



(WELCH and THAYER.) 



Figs. 7, 8, and 9 illustrate the sestivo-autumnal parasite. Fig. 7, ring-like 

 body, with a few pigmented granules. Fig. 8, crescent still in blood-cor- 

 puscle. Fig. 9, vacuolation of crescent. (WELCH and THAYER.) 



Fig. 10. Amoeba from section of intestine hardened in alcohol and 

 stained with methylene blue. (COUNCILMAN and L,AFLEUR.) 



