LETTER OE TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 

 Washington, D. C, April 7, 1908. 

 Sir : I have the honor to transmit herewith a revision of Farmers' 

 Bulletin No. 155, entitled " How Insects Affect Health in Rural Dis- 

 tricts," and recommend its republication in the present form. The 

 article was originally prepared by me for the Yearbook for 1901, in 

 which it appears under a different title, but in view of the very gen- 

 eral interest in the subject it has seemed desirable to republish the 

 matter for wide distribution to farmers, to whom the information 

 contained in the article is especially pertinent. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agi^iculture. 



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