LETTER OE TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau or Entomology, 

 Washington, D. C, April 20, 1909. 

 Sir: I have the honor to recommend for publication as Bulletin 78, 

 revised, of this Bureau the accompanying slightly revised copy of the 

 original edition of this bulletin, entitled " Economic Loss to the 

 People of the United States Through Insects that Carry Disease," 

 the supply of which is now almost exhausted. 



The United States is just awakening to a knowledge of the disas- 

 trous results following a lack of appreciation of the danger arising 

 from the unchecked development of mosquitoes and the typhoid fly, 

 and it is hoped that this bulletin will not only emphasize this danger, 

 but will also lend support to movements, both local and widespread, 

 toward the destruction (often so eas}') of these carriers of disease. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



