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devoted to intra-corporeal reproduction, we may see what 

 is known as the 'crescent body' (Fig. 22 — 7). This is a 

 crescent-shaped parasite lying inside a blood corpuscle 

 whose haemoglobin it has evidently devoured. By careful 

 looking one can make out as a delicate bow running 

 between the horns of the crescent the shell, as it were, of 

 the blood corpuscle, inside which the parasite developed 



Fig. 22. — Evolution of the Flagbllateb Body in the Tertian 

 (1 — 3), Quartan (4 — 6), and Crescent Forming (7—12) Parasites. 

 (Compiled from Thayer and Hewetson.) 



and is still lying. Presently the crescent slowly changes 

 its form. First it becomes stouter, as it were, the ends 

 rounding off more and the body becoming thicker (Fig. 22 

 — 8). Next it loses all appearance of being a crescent and 

 becomes ellipsoid (Fig. 22 — 9). Then slowly the ellipsoid 

 changes into a perfect sphere (Fig. 22 — 10). In the 



