Internal improvements, Land grants in aid of, 165 Iowa, Land grants to, 169, 179 Irrigable and pasturage lands of Utah, 104 areas, Increase of, by storage of water, 12, 13 land, Area of, sometimes not limited by water supply, 85, 86 Extent of, increased by the use of springs, 9 in Utah, Amount of, 9 lands, 23 Amount of water required for, 84 Disposal of, 27 highly productive, 10 Important questions relating to, 81 Increase in the extent of the, 57 in Utah Territory, Table of, 111 of Southwestern Utah, 148 of the Colorado Basin, 150 Table of, 164 Great Salt Lake District, 113 Sevier Lake District, 134 valley of the Sevier River, 128 Irrigable lands of the, Virgin River, 153 of Utah, Distribution of the, 9 Selection of, 87 Situation of the, 6 Irrigating canals, Cost of, 125 methods, Improvement in, 8 season, 85 Irrigation, Advantages of, 10 Amount of water needed for, 114 used in, 141 companies, 40 Coöperative labor necessary to the development of, 11 Direct influence of, upon the inflow of Great Salt Lake, 75 Indirect influence of, upon the inflow of Great Salt Lake, 76 of pasturage farms, 21 Quantitative value of water used in, 81 Unit of water used in, 81 Isohyetal line of twenty inches, 2 Jordan River, 121 drainage basin, Agricultural resources of the, 124 Area of the, 125 Mean flow of the, 72 _Juncus Balticus_, 109 _Juniperus Californicus_, 103 _Virginiana_, 103 Kanab Creek, Irrigable lands of, 154 Ponding of, 154 Kansas, Land grants to, 178, 179 Pacific Railroad Company, Land grants to the, 177 Kimball, Mr. Heber P., 61 King, Mr. Clarence, 66 Lake Bonneville, 96 Utah, Function of, as a reservoir, 123 Land grants in aid of internal improvements, 165 Lands, Classification of, 43 Irrigable. (_See_ Irrigable Lands.) of Utah, 93 and Idaho fertilized by water, 75 Physical features of the, 93 Pasturage. (_See_ Pasturage Lands.) Land system needed for the Arid Region, 25 Leavenworth, Lawrence and Galveston Railroad Company, Land grants to the, 178 Lower Columbia Region, 1 Precipitation of the, 49 Marshes, Drainage of, 74 Evaporation from, 74 Martineau, Mr. J. H., 113 Mean temperature by seasons for the San Francisco Region, 54 Method of determining the supply of water, 85, 86 Michigan, Land grants to, 179 Miller, Mr. Jacob, 61, 62 Mineral lands, 44 Disposal of, 44 not suited to agriculture, 44 Minnie Maud Creek, Irrigable lands of, 160 Volume of flow of, 160 Minnesota and Northwestern Railroad Company, 176 Land grants to the, 174, 179 Mississippi Valley, Flow of the rivers of the, 76 Missouri, Kansas and Texas Railroad Company, Land grants to the, 178 Land grants to, 179 Mitchell, Mr. John T., 59