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will have to be made. Such planning would involve not only the organiza- tion of the cloud-seeding program itself with respect to scheduling, loca- tions, extent, etc., but also consideration of storage facilHies! multiple- purpose use, priorities~ and many other factors. It cannot be assumed that dependable increases in water supply can be obtained by artificial means. Unless sufficient moisture-laden air under the right atmospheric conditions is available in a region, artificial seeding will not be effective. In periods and regions of drought, usually character- ized by very little cloudiness, major preciphation increases would be unlikely. Unfortunately, the potentialities and lirnitations of these weather modification techniques are not yet sufficiently clear to permit long-range planning with a satisfactory degree of confidence. If the prevailing scientific views are substantiated in practice, the potentialities of weather modification are significant to the future water supply of the western states. \Vhile the areas favorable to present cloud- seeding technique are sharply localized, there are many localities where the potential benefits appear large. As yet, however, only fragmentary studies of the economic benefits of weather control have been made even for the \Vest. Here is an important opportunity for applied economic research. There is need, too, for research along many other lines, for the scope of weather-caused economic difficulties is vast. For the \Vest it is believed that the cloud-seeding technique already is so important that it must be considered in planning for comprehensive river basin development. For the country as a whole, the newness of this development indicates the probability of rapid technical change. There will be a need for water resource planning at aU times to review current signifIcant work in weather modification. I ~e 26