Sir : For the purpose of giving completeness to the railroad reports of the route near the 
thirty-second parallel, the following extract is made from the report by Lieut. Col. Emory, of 
his reconnaissance in 1846 and 1847, from Fort Leavenworth, Missouri, to San Diego, California. 
The extract is from that portion of the report describing the route from the junction of the 
San Pedro with the Gila, to the junction of the latter with the Colorado of the West. 
This connects Lieutenant Parke’s survey (from Dona Ana to the Pimos villages) with Lieu¬ 
tenant Williamson’s surveys in the southern part of the State of California. 
Very respectfully, your obedient servant, 
A. A. HUMPHREYS, 
Captain Topographical Engineers. 
Hon. Jefferson Davis, 
Secretary of War. 
