320 PHARMACEUTICAL BACTERIOLOGY 



water, more remote from habitations. Air currents may carry them 

 greater distances. These discoveries have made possible a very effectual 

 campaign against this dread disease. The Federal Government aided by 

 State and Local Boards of Health have insisted on a discontinuance of 

 those breeding places which can be controlled easily. The larger more 

 public breeding places were covered with crude oil. Screening windows 

 and doors and sulphur or Pyrethrum fumigation of mosquito-infected 

 houses and rooms was insisted upon and individuals were instructed in 

 methods of self-protection against the bites of mosquitos. As a result the 

 yellow fever ravages are now reduced to a minimum. 



