DISTANCE, ETC. 145 
route of travel can be cultivated, but sixty per cent, is of greater or less 
value for grazing. ' 
DISTANCE, ETC. 
.The distance traveled by the main party, to the mouth of the Dirty 
Devil River, was two hundred and eighty miles, through a country, for the 
most part, completely unknown. I have not been able to find any evidence 
that white men ever before visited any considerable portion of the country 
explored. 
With the data collected, we shall be able to make a valuable reconnais 
sance map, showing the general features of the region, and quite full in 
detail, along the route traveled. 
I am, with great respect, your obedient servant, 
A. H. THOMPSON. 
J. W. POWELL, 
In charge Exploration of the Colorado River, and its Tributaries. 
19 COL 
