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Zeutschel OS7000, 400 dpi, 8 bit, 11,113,300 byteswould be required to fulfill the purposes sought, viz: The irrigation of the lands to be tilled by the Indians residing and to reside on the Sacaton Reservation to make them self-supporting. The reservation covers an area of 357,120 acres, most of which is arable and irrigable land if water could be had for it, but all of which is arid and unfit for habitation without irrigation. It is not stated in the act of Congress how much of this land it is desired to provide water for. It would not be possible with all the water supply of the river to irrigate more than half of it, but of course this would be vastly more than the actual requirements for the sustenance of the Indian, which Mr. Davis estimates to be about an acre and a half of ground per capita. The number of Indians now living on the reservation is estimated by the agent to be 7,250, including the migratory Papagos. In his opinion 2 acres per capita are needed for their sustenance. On this basis nearly 15,000 acres would be tilled if water were provided for irrigation; and assuming a rate of consumption of 2 acre-feet per acre, equivalent to 24 inches of rainfall, the volume needed would be 30,000 acre-feet. Possibly a less amount would suffice for immediate needs, but to provide for future increase in population and greater demand as they progress toward civilization, a reasonable surplus should be made available, and it is believed that 40,000 acre-feet would not be an excessive allowance in the way of storage provision, more than half of which would probably be used at once if made available. This volume of 40,000 acre-feet can be better appreciated, perhaps, by practical irrigators when it is understood that it would suffice to maintain a canal 10 feet wide at bottom, 17 feet wide at top, and 3 feet deep, flowing at a mean velocity of 2 feet per second for 250 days of each year. In the Salt River Valley a canal of this size would be looked upon as an ordinary lateral of a main canal.THE QUEEN CREEK PROJECT. The assumed minimum storage provision required of 40,000 acre-feet is so much in excess of the mean annual run-off of Queen Creek, as determined by the measurements of the past four years, as to render it impracticable to obtain the needed supply from this source. The total run-off during the period of nearly four years from January 1, 1896, to August 11, 1899, was but 42,500 acre-feet, while the minimum year gave but 6,000 acre-feet. This site being thus so emphatically self-condemned for the purposes sought, further discussion of the dam and its construction is quite necessary. The sole resource for adequate water supply is therefore narrowed down to the main Gila River. STORAGE UPON THE GILA RIVER. From all previous measurements and available data for the years 1889, 1895, 1896, 1897, 1898, and 1899, Mr. Lippincott concludes that the minimum flow past the Buttes during that period was 353,639 acre-feet per annum, the maximum flow 616,206 acre-feet, and the mean flow 469,093 acre-feet per annum. Having a river of this large volume with which to deal, the question at once arises as to whether it is feasible, desirable, or proper to construct a dam and reservoir in the immediate channel of the Gila of so small capacity as 40,000 acre-feet, through which all the water of the stream must necessarily pass, when the maximum flow is more than fifteen times the suggested reservoi