LETTER OE TRANSMEFTAL. 



u. s. dei'ailtment of agriculture, 



Washington, D. C, Ju/i/ ':JS, 1900. 



Sir: I have the honor to transmit for publication, as No. 19 of North 

 American Fauna, a report entitled ' Results of a Biological Reconnois- 

 sanco of the Yukon River Region,' by Wilfred H. Osgood and Louis 

 B. Bishop. 



Under instructions dated May 11, 1899, Wilfred H. Osgood, an 

 assistant in the Biological Survey, proceeded to Skagway, Alaska, 

 and thence over White Pass to the headwaters of the Yukon and down 

 the entire length of the Yukon River to St. Michael. He was accom- 

 panied by Dr. Louis B. Bishop, of New Haven, as volunteer assistant; 

 Dr. Bishop has prepared the report on the birds observed during the 

 trip. These are the first investigations of the kind undertaken on the 

 Upper Yukon, and the results herewith presented will be found to 

 contain many important facts concerning the distribution of mammals, 

 birds, and trees in this region. 



Respectfully, 



Hon. James Wilson, 



Secretary of Ayrieultare. 



C. Hart Merriam, 



Chief., Biological Survey. 



