LETTER OF TRANSMITTAL. 



United States Department of Agriculture, 

 Division of Economic Ornithology and Mammalogy, 



Washington, D. C, July 20, 1887. 



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

 letin No. 2 of the Division of Economic Ornithology and Mammalogy, a 

 special report upon Bird Migration in the Mississippi Valley in 1884 and 

 1885, by Prof. W. W. Cooke. 

 Bespectfully, 



0. Hart Merriam, 



Ornithologist. 

 Hon. Norman J. Oolman, 



Commissioner of Agriculture. 



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