80 HOUSEHOLD INSECTS 



however, that that person was bitten at some time by an 

 Anopheles mosquito, else the germs could never have 

 gained access to the blood. 



RELATION OF MOSQUITOES TO YELLOW FEVER 



That yellow fever is not a contagious disease, but one 

 that, like malaria, is carried from one individual to another 

 only through the agency of a mosquito, has been finally 

 and authoritatively settled. It must be said, however, 

 that no one has yet discovered the parasite that causes 

 yellow fever. It is either too small to be seen with any 

 lens now made or it inhabits some organs of the body not 

 suspected or its habits are entirely different from any other 

 parasite with which we are familiar. In any case the 

 germ has eluded all efforts to locate it and scientists are 

 ignorant regarding its real nature, habits, and appearance. 



PROOFS THAT YELLOW FEVER IS CARRIED BY MOSQUITOES 



Carlos Finlay, as early as 1881, promulgated the theory 

 that mosquitoes transmit yellow fever and he carried on 

 some experiments at that time in which he claimed to 

 have conveyed the disease from yellow fever patients 

 to non-immunes through the bites of mosquitoes. It 

 was not, however, until the early part of 1900 that more 

 serious experiments were undertaken to determine the 

 actual agents in the transmission of yellow fever, and 

 the relation of this disease to mosquitoes if any existed. 

 During this year a medical commission from the United 

 States Army, consisting of Walter C. Reed, James 



