LETTER TO THE SECRETARY OF WAR. 
Washington, February 9, 1857. 
Sir : I have the honor to transmit, herewith, the report of explorations and surveys made 
for Pacific railroad purposes, in pursuance of your instructions. The report embraces the 
operations of the party in the field, and results obtained ; and is accompanied by maps and 
profiles of the route surveyed, exhibiting the topography of the districts through which they 
are located, and a continuous profile of the route by the 32d parallel, showing therein the data, 
as obtained from the present survey. 
Yery respectfully, your obedient servant, 
JOHN 0. PARKE, 
Lieutenant Corps of Topographical Engineers. 
Hon. Jefferson Davis, 
Secretary of War. 
