WASHINGTON, D. C., June 16, 1874. 
SIR: I have the honor to submit herewith my report of the explora 
tion of the Colorado River of the West and its tributaries, and respectfully 
request that the same may be forwarded to Congress. 
I am, with great respect, your obedient servant, 
J. W. POWELL. 
Prof. JOSEPH HENRY, 
Secretary Smithsonian Institution, 
Washington, D. C. 
