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Abstract
An objective method for measuring freezing nucleus concentration with improved accuracy is described and the results of a series of measurements made on the coastline in an on-shore wind near Carnarvon, Western Australia are given. Fluctuations in ice crystal counts existed which were well beyond the probable experimental error and appeared to be independent of weather conditions, except for the occurrence of cirrus cloud. A remote terrestrial source or an extraterrestrial source of nuclei is indicated.