LETTER OF TRANSMITTAL 



TJ. S. Geological akd GrEOGKAPHiCAL 



SUETET OF THE TERKITOEIES, 



Washington, B. C, Octoler 31, 1878, 

 SIR: 



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



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



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



worthy of favorable consideration as a repository of scienttftc 



andpopular information concerning North American ornithology. 



I am, Sir, &c., 



^^ 



<^~tnic/ 



De. F. Y. Hatben, 



U. 8, Geologist, &c., <fcc., 



Washington, B. 0. 



