LETTER OF TRANSMITTAL. 



Washington, I). C, May 1, I860. 



Dear Sir: I Bubmit herewith my report on the geoloery of the country traversed 

 by the San Juan Exploring Expedition, in which I had the honor to serve under your 

 command. 



Very respectfully, your obedient servant, 



J. S. Newberry. 

 Capt. J. N. Macomb, 



Topographical Engineers, United State* Army. 



