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. 
Respectfully, 
C. HART MERRIAM, 
Ornithologist. 
Hon. NoRMAN J. CoLMAn, 
Commissioner of Agriculture. 
