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Figs. 1, 2, and 3 show three phases of the parasite of tertian fever. 
Fig. 1, 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 estivo-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 LAFLEUR.) 
