MAN 



MOSQUITO 



•■=L-r-''i'!r^C^ii: 



s<5. 



,A«'r*\'^^--\ Sexual stage 



-i-^?i ' "©^^S Spores x's*- ;■ 



Mosquito's 

 stomach 



■with 

 swellings 



Zygote |{^^- 



New 



individual 

 in insect's /i-~«*--"-*-|, 

 stomach tj 

 wall 



Corpuscle | 



Spores to 

 salivary glands 



Mere spores 



from salivary 



glands 



Corpuscle 



THE MALARIA PARASITE 



Inside the body of the mosquito the parasite undergoes many changes, which include 

 the formation of sexual stages and a conjugation. The zygotes find their way into 

 the walls of the stomach; and after repeated subdivision of the protoplasm, tiny 

 spores in swellings formed in the salivary glands are discharged when the insect 

 stings again 



phia, New York, and Boston. It had long been suspected by many students 

 of the problem that this disease is transmitted by mosquitoes. At the close of 

 the Spanish-American War a commission of American physicians definitely 

 proved the charge against Stegomyia fasciata, now called Aides. The com- 



622 



