MALAEIAL PEVEH 161 



sundown, the occupants of a well-screened house are 

 comparatively safe from infection. 



Among the many extremely interesting experi- 

 ments carried on to demonstrate the proof that the 

 Anopheles is the host of the parasite of malaria were 

 those of the Enghsh doctors who lived for months 

 on the Roman Campagna, where malaria has raged 

 for centuries. These men occupied a mosquito-proof 

 house, and while they drank the same water and 

 mixed freely with many natives who were suffering 

 from the disease, they did not contract it. 



Another interesting experiment was made by 

 sending mosquitoes which had bitten malarial 

 patients, from Italy to England, where Dr. Manson 

 permitted himself to be bitten by them and con- 

 tracted a typical attack of malarial fever. 



