Table I. Precipitation of the Sub-humid Region, 47 II. Arid Region, 48 III. San Francisco Region, 49 IV. Region of the Lower Columbia, 49 V. Texas, 50 VI. Dakota, 51 VII. Season of precipitation in the Region of the Plains, 52 VIII. San Francisco Region, 53 IX. Mean temperature, by seasons, for the San Francisco Region, 54 X. Seasonable precipitation and temperatures on the Pacific coast, 55 XI. in Arizona and New Mexico, 56 of irrigable lands in Utah, 111 of southwestern Utah, 149 of the Colorado Basin, 164 Sevier Lake District, 144 of mean annual precipitation in Colorado, 79 Nevada, 79 Utah, 79 Wyoming, 79 Tavaputs Plateau, 93 Drainage of the, 96 Temperature dependent upon altitude and latitude, 2 Temperatures, Seasonal, on the Pacific Coast, 55 Texas and Pacific Railroad Company, Land grants to the, 179 Precipitation of, 50 The High Plateaus, 94 Thomas, Prof. Cyrus, 71 Thompson, Prof. A. H., cited, 86, 110 on the irrigable land of the Colorado Basin, 150 Timber, 98 Areas of standing, 15, 17 Cultivation of, 19 Destruction of, by fire, 15 growth dependent upon climatic conditions, 14 lands, 14, 23 Boundaries of the, 14 Disposal of the, 27 Situation of the, 6, 14 regions, 15 Extent of the, 16 Fires in the, 15, 17, 18, 99 Titles to public lands, 25 Uinta Mountains, 93 Drainage of the, 96 Orographic structure of the, 97 Uinta River, Irrigable lands of the, 160 Tributaries of the, 160 Volume of flow of the, 160, 161 White Basin, 93 Amount of irrigable lands in the, 105 Description of the, 104 Physical features of the, 160 Union Pacific Railroad Company, Land grants to the, 177 Unit of water supply, 8, 84, 115, 141 Method of determining the, 8 used in irrigation, 81 Utah, Amount of cultivated land in, 84 Church government in, 89, 128 Drainage of, 94 Forest trees of, 100 Grasses of, 107 Irrigable and pasturage lands of, 104 Lake, 123 Lands of, 93 Mean annual precipitation in, 79 Pasturage lands of, 104 Prevailing winds of, 68 Table of irrigable lands in, 111 Timber of, 98 Variety of crops cultivated in, 84 Watershed of, 94 Valley, Castle, 105 Circle, Amount of irrigable land in the, 137 Gunnison, 105 Irrigable lands of the, 162 of the Mississippi, 76 Sevier River, Amount of irrigable land in the, 144 Panguitch, Amount of irrigable land in the, 136 San Pete, Amount of irrigable land in the, 138 Flow of the streams of the, 140 Vasey, Dr. George, 108 _Vilfa_ (_Sporobolis_) _airoides_, 108 Virgin River, Irrigable lands of the, 153 Volume of water flowing in the streams, Determination of, 8 Wagon roads, Land grants in aid of, 166 Ward, Mr. L. F., 103