THEIR RELATION TO MAN 



205 



"zygote." In about ten days this form matures and 

 bursts, liberating thousands of "blasts" or " sporo- 

 zoits" into the body cavity of the mosquito. In 



Fig. gs. — Anopheles and Malaria; o, larva; b, pupa; c, adult; d, the blast 

 introduced into the blood by the mosquito; e to ;', stages through which the 

 Plasmodium passes in the red blood-corpuscle; k, the spores which enter new 

 blood-corpuscles; /, m, the microgamete; n, o, the macrogamete; p, flagella; 

 forming; q, union of a flagellum with macrogamete; r, fusion of nuclei; s. the 

 vermicule; t to y, formation of the zygote in the mosquito stomach; the fully 

 developed zygote, y, rupturing to produce blasts d. 



