THE CONQUEST OF THE MOSQUITOES 191 



do me so much good. I do not approve of chewing 

 gum, but rather than keep the taste of that 

 quinine in my mouth I chewed a whole package 

 of gum after every dose. 





Fig. ^2. Grassy shore of Gatun Lake 

 where mosquitoes breed 



I met one American who had come to the 

 hospital to be treated for malaria with which he 

 had become infected in the swamps outside the 

 Canal Zone. At the time I saw him, he felt 

 quite well enough to go on about his business, but 

 the hospital was not yet ready to let him go 

 outside the mosquito-free town of Ancon. They 

 intended to keep him there until they were quite 

 certain he had no malaria left in his blood for 



