Dr. Irving Langmuir, high priest of scientific rainmaking, sounded a solemn warning last week: those who sow too many rainstorms may reap nothing but droughts. Speaking at the School of Mines in drought-threatened New Mexico, Langmuir denounced the commercial rainmakers, many of them woefully ignorant of the art, who are seeding the atmosphere with silver iodide throughout the dry Southwest. "Some of them," he said, "are using hundreds of thousands of times too much. No more than one milligram [.000035 oz] of silver iodide should be used for every cubic mile of air."...
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