Dr. W. E. Smythe in his fascinating book "The Conquest of Arid America" calls attention to the fact that the real dividing line between the east and the west is the 97th meridian which divides in twain the Dakotas, Nebraska, Kansas, Oklahoma and Texas. East of this line is the region of fairly assured rainfall. To the westward stretches the vast area of arid land with a rainfall insufficient to sustain agriculture; and with only three or four people to the square mile, though with resources enough to support a hundred million people. With a climate matchless for health and a varied and beautiful scenery, coupled with untold mineral deposits and a soil fertility that is remarkable, this great section is slowly coming to its own, through the method of irrigation, from the mountains and the streams. With characteristic western spirit the above author remarks, "Even in humid regions nothing is so uncertain as the time and amount of the rainfall. In the whole range of modern industry nothing is so crude, uncalculating and unscientific as the childlike dependence on the mood of the clouds for the moisture essential to the production of the staple necessities of life." The superiority of irrigation as a certain means of water supply which can be regulated at will is a thesis easy to maintain. The results make a marvelous story. "The canal is an insurance policy against loss of crops by drought, while aridity is a substantial guarantee against injury by flood. The rich soils of the arid region produce from four to ten times as largely with irrigation, as the soil of the humid region without it. Twenty acres in the irrigated West should equal 100 acres elsewhere. Certainty, abundance, variety--all this upon an area so small as to be within the control of a single family through its own area, are the elements which compose industrial independence under irrigation." The small farm unit, usually from five to twenty-five acres, brings neighbors close together, abolishing loneliness and most of the social ills of farm life in the East. Beautiful irrigated villages are springing up which rival in comfort and privilege most places on earth, and combine both city and country privileges, where rural and urban meet. The spirit of cooperation is strong in irrigated communities, enforced by the common dependence upon the common enterprise and water supply. This is well illustrated by the Mormon commonwealth, the pioneer irrigators of the West.