CHAPTER VI 



MEASURES TAKEN TO KEEP THE ISTHMUS FREE 

 FROM YELLOW FEVER 



A LL houses in the Canal Zone occupied by 

 American and foreign employees are not 

 only screened, but the screening is kept in effective 

 condition, inspected at frequent intervals, and 

 repaired whenever defects occiu:. The lower parts 

 of doors and aU other screens subject to abuse are 

 properly protected. All houses near settlements 

 and adjacent territory are inspected each week 

 for possible mosquito-producing containers. Any- 

 thing that can hold rain water is removed, or so 

 placed that water cannot remain in it. Foremen 

 of gangs are ordered not to leave any material 

 exposed that may collect rain water. Water in 

 or on objects that cannot be moved, is treated 

 with oil or larvacide. Tin cans and other waste 

 material are buried. Where water is collected in 

 barrels or tanks at isolated houses, these containers 

 are made non-accessible to the mosquitoes. Tall 



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