District, Great Salt Lake. (_See_ Great Salt Lake District.) Sevier Lake. (_See_ Sevier Lake District.) Division lines of pasturage farms, 22, 28, 37 of land by settlers, 38 Drainage area, Colorado, 94 Desert, 94 Modification of the conditions of, 73 of the Tavaputs Plateau, 96 Uinta Mountains, 96 Wasatch Mountains, 96 Utah, 94 Drummond, Willis, jr., on land grants in aid of internal improvements, 164 Dry farming, 50, 78 Duchesne River, Volume of flow of the, 160 Dutton, Capt. C. E., cited, 110 on the irrigable land of the Sevier Basin, 128 East Florida Railroad Company, Land grant to the, 169 Egg Island, 67 Engelmann, Mr., 102 _Erocoma cuspidata_, 108 Escalante River, Irrigable lands of the, 156 Volume of flow of the, 156 _Eurotia lanata_, 110 Evaporation by spreading of water, 74 Farmington pillar, 61 Farming without irrigation, 77 Farm residences, Grouping of, 22 unit for pasturage lands, 21, 28 Fencing of pasturage lands, 23 Fires in the timber region, 15, 99 Cause of, 17, 99 Protection from, 18, 99 Flood-plain lands, 88 Forests, Amount of rainfall necessary to the growth of, 15 Fox, Mr. Jesse W., 61, 113 _Fraxinus anomala_, 103 _coriacea_, 103 Fremont Island, 62, 67 River, Irrigable lands of the, 157 Tributaries of the, 157 Volume of flow of the, 157, 158 Gilbert, G. K., cited, 84, 110 on irrigable land of the Salt Lake drainage system, 113 on water supply, 57 Government right to use of subsidized railroads, 181 Grand River, Irrigable lands of the, 163 Volume of flow of the, 163 Grasses of the pasturage lands, 19 Utah, 107 Great Salt Lake, Accumulation of the water in, 58 Area of, 66, 73 Basin (_See_ Great Salt Lake District) Causes of abnormal change of, 67 Desert, 66 Diagram showing rise and fall of, 64 District, 94 Amount of irrigable land in the, 107 Change in the climate of the, 68, 70 Description of the, 107 Irrigable lands of the, 113 Fluctuations in the rainfall of the, 70 Irrigation by large streams in the, 117 small streams in the, 126 Evaporation of the water of, 58, 72 History of the past changes of, 62 Increase and decrease of the size of, 58 Islands of, 62 Limited oscillation of, 59 Limit of wave action of, 65 Record of height of, 60 Rise and fall of, 59 Storm lines of, 65 Streams flowing into, 72 Green River, Irrigable lands of the, 162 Volume of flow of the, 162 Gunnison, Captain, 98 Valley, 105 Irrigable lands of the, 163 Hayden, Dr. F. V., 71 Henry Mountains, 105 Prof. Joseph, 46, 59, 62, 79 Henrys Fork, Irrigable lands of, 161 Illinois, Land grants to, 168, 172 Increase in water supply in the Arid Region, 57, 89, 91 of rainfall, 69, 91 Indiana, Land grants to, 166, 167