Abstract
A description is given of one flight below cumulus clouds on 28 Aug. 1952. Small rapid fluctuations of temperature were observed by a sensitive resistance thermometer, records being obtained as a photographic trace. It is shown that, with respect to the frequency and type of fluctuation of temperature encountered, the space between cloud base, i.e., 3,100 ft, and ground level may be divided into three sections. The first, a layer extending from ground to about 800 ft, the second from 800 ft to about 2,800 ft, and the third from 2,800 ft to cloud base. A possible explanation for the formation of these layers is discussed.

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