CONCLUSION. 45 
Oregon, and Captain Hector McArthur, late Hudson Bay factor near Fort Hall, for valuable 
assistance. Leaving my own tired party and worn-out horses in camp, Captain McArthur 
accompanied me, with a single half-breed, in a long reconnaissance of the numerous passes of 
the upper rim of the Great Basin during many days' forced marches in hostile Indian country, 
and continued exposure to violent storms of snow and sleet. 
Itake this public method of acknowledging my obligations to the officers of the military 
stations of Vancouver and the Dalles for the courtesy and assistance received from them in 
organizing the expedition. 
All of which is respectfully submitted by 
FRED. W. LANDER. 
Wasuinaton, July 21, 1856. Civil Engineer. 
[This Report has been revised since its first transmission to the War Department.] 
