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Abstract
Dear Sir,We thank Dr Birstein for his discussion of our study which was done when we were at Sendai. We studied the nature and origin of condensation nuclei and concluded that the greater part of cloud and fog nuclei are composed of both hygroscopic and non-hygroscopic substances which originate in combustion and that sea-spray was not a significant source of condensation nuclei. It was also shown that the greater part of the hygroscopic substances contained in the nuclei were not pure sulphuric acid.