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<br />~ . <br />. <br /> <br />Neyman's, et aI, (1969) conclusion that "the conditions in which <br />increases or decreases due to seeding occur are largely unknown," <br />already partly contradicted by the studies cited in the last para- <br />graph, raises the question whether or not this conclusion is a <br />measure of the authors' unfamiliarity with or low regard for the <br />rapidly expanding results of computational modeling of clouds and <br />precipitation processes and experimental results associated with <br />them. <br /> <br />If Osborn had been less selective in examining other analyses of <br />the consequences of summertime cloud seeding, these might have <br />included a series of evaluations by McDonald of commercial opera- <br />tions, some of which were under cumulus conditions, an evaluation <br />by Brier, Carpenter, and Kline (1967) some of which likewise were <br />cumulus, reports by commercial operators based on official rainfall <br />reports and following methods of analysis not unlike those used by <br />Osborn, and finally the earliest reports of Project Cirrus of cloud <br />seeding in New Mexico. While none of these are conclusive in elimi- <br />nating from consideration the questions Osborn has raised, they <br />redress the balance sharply toward evidence, if not proof, of <br />positive effects. <br /> <br />4 <br />