11 



breeding places should be made within a radius of a mile. This dis- 

 tance is mentioned, since it seems rather definitely proven that the 

 Anopheles mosquitoes do not fly for great distances.. After the breed- 

 ing places are found they should be drained or filled in with earth, or 

 they should be rendered uninhabitable to the Anopheles larvas by cov- 

 ering the surface of the water with a thin film of kerosene oil, or by 

 introducing certain fish which feed upon the larvse, such as top min- 

 nows, sticklebacks, young sunfish, or goldfish. 



Pending the result of such exterminating measures, all houses in 

 malarious localities should be carefully screened to prevent the entrance 



Fig. 4. — Eggs of Anopheles — enlarged (author's illustration). 



of mosquitoes. After screening, thorough search should be made in 

 the house for mosquitoes which have already gained entrance. Such 

 as are found roosting upon the walls should be captured by placing an 

 inverted vial over them, or they may be stupefied by burning a small 

 amount of pyrethrum powder upon a tin-dish cover. Persons wishing 

 to avoid malaria should not sit out of doors exposed to the bites of 

 mosquitoes at night. Persons havinjr malaria should be carefully 

 screened at night to prevent them from being bitten by mosquitoes, 

 which, becoming thus infected, would become potential carriers of 

 the disease. Such patients, systematically treated with quinine, the 

 dose being always given at the beginning of the chill, will soon be rid 



