Description of Fig. 5. 



Life history of malaria parasite, Plasmodium, i, Sporozoite, intro- 

 duced by mosquito into human blood, the sporozoite becomes a schizont; 

 2, young schizont; 3, young schizont in a red blood -corpuscle; 4, full- 

 grown schizont; 5, nuclear division; 6, spores, or merozoites, from a 

 single mother-cell; 7, young macrogamete (female), from a merozoite, 

 and situated in a red blood-corpuscle; "ja, young microgametoblast 

 (male); 8, full-grown macrogamete; 8a, full-grown microgametoblast; 

 9, mature macrogamete; ga, mature microgametoblast; gh, resting cell, 

 bearing six flagellate microgametes (male) ; 10, fertilization of a macro- 

 gamete by a motile microgamete; the macrogamete next becomes an 

 ookinete; 11, ookinete, or wandering cell, which penetrates into the wall 

 of the stomach of the mosquito; 12, ookinete in the outer region of the 

 wall of the stomach, i. e., next to the body cavity; 13, young oocyst, 

 derived from the ookinete; 14, oocyst, containing sporoblasts, which 

 develop into sporozoites; 15, older oocyst; 16, mature oocysts, con- 

 taining sporozoites; 17, transverse section of salivary gland of an Anoph- 

 eles mosquito, showing sporozoites of the malaria parasite in the gland 

 cells surrounding the central canal. 



^ 1-6 .illustrate schizogony (asexual production of spores); 7-16, spo- 

 rogony (sexual production of spores). 



(FoLSOM — After Grassi and Leuckart, by permission of Dr. Carl 

 Chun.) 



114 



