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yet been' developed any method that giyes even reasonably good assu rance .-of success in connection with any particular hail storm.”
Dr. Reichelderfer said field tests had been conducted, but “unfortunately, these tests, both here and abroad, have not been as conclusive as everybody hoped they would be.” . ' .
“Careful examination of the data from experiments in haiF suppression here and abroad still leave uncertainties as to whether cloud seeding is effective in suppressing hail or not.” he continued in his letter to the Virginia legislator; “study of,these cases shows that in many instances the effects tphich were first believed to be due to cloud seeding were probably the results of other natural caiises,’1'
The whims of weather ben g a* they' are, “it is very easy to misinterpret the results and to ascribe to some artificial agent a result which was a consequence of other factors,” the Weather Bureau chief commented. . Mr. Harrison said he made the inquiry m an effort to give’farmers some light on the progress of experiments in changing weather bv sprinkling dry ice, silver iodide crystals and othef chemical substances in the clouds
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