13 — 



The Life Cycle of the Malaria Parasite: — i. The sporozoite or spore intro- 

 duced by the mosquito bite into human blood ; 2. The same free in the blood ; 3- 

 5. Changes which it undergoes within the red blood-cells; 6. Merozoites (spores) 

 formed by division ; 7-9. Development of a microgamete or female cell ; 7a, 8a, 9a, 

 9b. Development of a microgamete or male cell; 10. Conjugation of the two 

 sexual cells; 11. The resulting zygote; 12. Zygote that has entered the body of 

 the mosquito as far as the stomach, lying at the base of two cells; 13-16. Zygote 

 transformed into an oocyst filled with spores; 17. Cross-section of Salivary gland 

 of mosquito, showing gland cells full of spores which have wandered in from 

 cysts formed on the outside of stomach. (After Grassi and Leuckart). 



