PLASMODIUM 



377 



FIG. 240. Life history of malarial parasite, Plasmodium. i, Sporozoite 

 introduced into human blood by bite of mosquito; 2, same a little later; 3 and 

 4, same growing in a red blood-corpuscle; 5, same dividing; 6, blood-corpuscle 

 disintegrated and setting free the spores; 7, 8 and 9, a spore developing into a 

 female gamete; 70, 8a, ga and gb, a spore developing into a number of male 

 gametes; 10, union of male and female gametes (fertilization); n, motile zygote; 

 12, zygote embedded in the wall of the stomach of the mosquito; 13 to 1 6, stages 

 in the development of sporozoites in the sporocyst; 17, sporozoites in the salivary 

 gland of the mosquito. Stages from i to 8 in the human blood. Stages 8 to 17 

 in the mosquito. (From Folsom after Grassi and Leuckart.) 



