54 



ANIMAL BIOLOGY 



fever, and so it was proved for all time that this disease cannot be 

 communicated by means of anything that comes from the body 

 of yellow fever patients. 



Dr. Reed now sought to prove that the Stegomyia mosquito was 

 the means by which the disease was transmitted from one person to 

 another. A second building, the same size as the first, was erected, 

 the room was divided by a wire screen, and all the doors and windows 

 were carefully screened (Fig. 37) . Into one of the rooms a number of 

 mosquitoes that had bitten yellow fever patients were freed and a 



^K-^t/cZiU frif^K.^^t^ ^^.c^i^ 



Ty,^,^ 



ll-^14J£Uw^ 





^ 1 











'Sid n,t iUL-\ 



Fig. 37. 



Plan of infected mosquito building, 

 by John R. Kissinger.) 



(Drawn for the authors 



few minutes later John Moran, an Ohio soldier, entered and allowed 

 these mosquitoes to bite him. " On Christmas morning (1900) at 

 11 A.M. this brave lad was stricken with yellow fever and had a 

 sharp attack which he bore without a murmur." On the other side 

 of the screen were three soldiers who were protected from mos- 

 quitoes ; and these men remained in perfect health. This experi- 

 ment proved conclusively that yellow fever is transmitted by the 

 Stegomyia mosquito. 



42. Extermination of mosquitoes. — Now all the suffer- 

 ing from malaria and yellow fever is entirely unnecessary 



