LETTER OF TRANSMITTAL 



U. S. Department of Ageicultube, 



Biological Scryey, 

 Washington, D. C. , August i, WOlj,. 

 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, 



Chief, Biological Survey. 

 Hon. James Wilson, 



Secretary of Agriculture. 



