14 
SURVEY OF THE COLORADO OF THE WEST. 
position of the mountains and calls them North-Side Mountains. This 
group of mountains we have found to be composed of three great mount- 
ain masses along which and standing about for a score of miles in every 
direction are volcanic cones, 118 in number. The position of every cone 
in the group lias been determined in the secondary triangulation, and 
the data collected to make an elaborate map of this region on a scale of 
two inches to the mile. The Indian name for this group is U-in-kar'-ets, 
(the Mountains where the Pines stay) and this (U-in-kar'-ets) is the name 
by which they are known to the people of Southern Utah and Northern 
Arizona who live in sight of the mountains and who have daily use for 
some name. As the names given by Whipple and Ives were doubtless 
intended only as provisional, this Indian name has been adopted. Other 
mountains have been added to the general stock of geographic knowl- 
edge, and many which have been seen by other travelers have been 
located and their outlines defined on the maps. 
VALLEYS. 
One- third of the entire area of the United States is so arid that 
agriculture is dependent on irrigation, and within that same area it is 
not possible to redeem for agricultural purposes more than three per 
cent, of all this territory, probably much less. The deposits of precious 
metals, ores, and other minerals are the chief incentives to the settle- 
ment of this country. With a proportion of area fit for agricultural 
purposes so small that the probable demand for the products of the soil 
by those who follow other pursuits will be greater than can be supplied 
by the agriculturists, it is a matter of primary importance to determine 
the amount of water which can be used for irrigation, and the extent of 
the several districts to which these waters can be applied. Impressed 
with the importance of this, we have carefully examined the facts to 
determine the several districts of country which can be used for agri- 
cultural purposes within the territory embraced in the survey. In the 
mountainous regions where is found the maximum precipitation of moist- 
ure in this country, there are small elevated valleys, but they are too 
cold for successful cultivation, and are only valuable for summer pas- 
turage and hay-fields. On the more elevated plateaus we find extensive 
grass lands; they are also too cold for general agricultural purposes. On 
the lower plateaus and hilly countries the lands are desert wastes, often 
covered with drifting sands or surfaces of naked rock. A few valleys 
nestling along the rivers can be made available to the farmer. Chief 
among these are the following: 
Henry : ? s Fork runs along the northern slope of the Uintah Mountains, 
and empties into Green Fiver before the last-mentioned stream enters 
the range. There is a narrow alluvial valley along its course for nearly 
fifty miles, in a few places two or three miles in width, and covered here 
and there with a growth of cotton-wood trees, but, being more than 
6,000 feet above the level of the sea, it is rather cold; but the pas- 
