LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Biological Survey, 



Washington^ D. C. , August 1, 1904^. 

 Sir: I have the honor to transmit herewith for publication as 

 Bulletin No. 18 of the Biological Survey a report on the Distribu- 

 tion and Migration of North American Warblers, by Wells W. Cooke, 

 an assistant in the Survey. 



Respectfully, C. Hart Merriam, 



Chiefs Biological Survey. 

 Hon. James Wilson, 



Secretary of Agriculture. 



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