LETTER OF TRANSMITTAL 



U. S. Geological ajstd Geographical 



Survey of the Territories, 



WasJiington, J). C, October 31, 1878. 

 SIE: 



I have the lionor to transmit lierewith, for approval and for 



publication, Part First of a treatise entitled "Birds of the 



Colorado Valley ", which I have taken great pains to render 



worthy of favorable consideration as a repository of scientific 



and popular information concerning North American ornithology. 



I am, Sir, &c.. 



Dr. F. V. Hayden, 



U. 8. Geologist, (fee, <&c., 



Washington^ D. C. 



