Abstract
Abstract Summer convective clouds over a fairly isolated mountain range over southeastern Arizona were seeded by means of airborne silver-iodide generators. The selection of days to be seeded was made according to a randomization scheme involving the examination of pairs of days. After a program conducted during the period 1957 to 1960 failed to show that rainfall was increased, the experimental procedures were changed and a second set of tests were performed during 1961, 1962 and 1964. This report deals with the analysis of rainfall measured by networks of recording rain gages over the mountain target. The data do not support a hypothesis that rainfall was increased as a result of the silver-iodide seeding.
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