86 



Mosquitoes 



days both developed the fever, tertian parasites be- 

 ing found in their blood by experts. 



In the same way 

 Drs. Low, Samb- 

 on, and two others 

 spent the fever 

 season in Ostia, 

 Central Italy, right 

 in the midst of 

 gL) V the dreaded Ro- 

 man Campagna. 

 No quinine or oth- 

 er drugs were 

 used, but the men 

 were careful to 

 retire into a well 

 screened hut an 

 hour before sunset, 

 going freely about 

 all day. Not one 

 of them contracted 

 malaria. 



In North Amer- 

 ica Anopheles mac- 

 ulipennis, as well 

 as punctipennis and crucians, according to Dr. 

 Duprec, transmits malaria. 



Protozoa in General. — The cause of malaria, as 

 stated above, is a protozoan. Now a protozoan is 

 decidedly not a bacterian. It is an animal, a uni- 

 cellular animal. Perhaps it will be well to briefly 

 discuss protozoa in general. They are microscopic in 



FlG. 17. — </, l'upa of Anopheles cru- 

 cians ; 6, front view of paddles. Both 

 greatly enlarged. 



