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42. of Las Vegas. The Las Vegas Land and Water Company, which owns and operates the waterworks, reports that with the advent of air conditioning, water consumption has increased, until in 1938 the city, with a population of about 8,000, is consuming about 5,000,000 gallons a day. This water is obtained by the water company from the original spring and from two flowing wells that discharge into the main reservoir. The wells are allowed to flow wide open continuously, and any excess water that the city does not use overflows into the creek and runs to a ranch northeast of the city. Conclusions The results of the tests -with the deep-well current meter in 34 artesian wells in the Las Vegas area -show that the underground leakage from these wells is small. A few wells that are poorly constructed or improperly cased leak an appreciable amount of water, but the aggregate leakage is small. It is believed that the wells tested are fairly representative of the wells in the area and that the loss of artesian water by underground leakage is not great. The material of the valley fill varies widely from place to place, but it is generally coarser near the mountains and finer toward the valley, and therefore wells are less likely to leak through the fins overlying material in the valley than through the coarser material toward the mountain. The material varies so widely from place to place that it