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<br />which is the Santa Catalina experiment. The key question is, what valid <br /> <br />inferences can be drawn from these sources with respect to ARIDROP? <br /> <br />In the World Meteorological Organization meD~randum published at about <br />the time the Catalina experiment was being designed, Ludlum et al (1955) <br />noted: <br /> <br />"It must be clearly recognized, however, that operational <br /> <br />and testing projects have necessarily adopted particular <br />operational practices and seeding techniques. Consequently <br />they cannot be considered as having been designed to eval- <br />uate the basic 'seedability' of clouds, but rather the <br />effects of the particular techniques used on the rainfall <br />of a particular area. Any results obtained must be qual- <br />ified by the conditions of the tests." (Emphasis added.) <br /> <br />In reporting the disappointingly inconclusive results of the Catalina <br /> <br />experiment, Battan and Kassander (1967) paraphrased this caveat: <br /> <br />"It is important to recognize that these tests used a specific <br /> <br /> <br />type of seeding on a specific class of clouds. These results <br /> <br />cannot be directly extrapolated to other techniques, other <br /> <br /> <br />regions, or even other clouds of similar appearance elsewhere." <br /> <br />The following are the significant differences in technique between <br />ARIDROP and the Catalina experiment. <br /> <br />3 <br />