LETTER OF TRANSMITTAL 



IT. S. GEOLOGICAL AND GEOGRAPHICAL 



SURVEY OF THE TERRITORIES, 



Washington, D. 0., October 31, 1878. 

 SIB: 



I have the honor to transmit herewith, for approval and for 

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

 Colorado Yalley w , 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. Y. HAYDEN, 



U. 8. Geologist, &c., &c., 



Washington, D. C. 



iii 



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