Some features are described of convection between a uniform surface and the bases of small fair-weather cumuli. Areas of steady uniform temperature are found, interspersed with areas in which the temperature fluctuates about some higher value. These thermal structures are not apparent in regions close to the surface, and their temperature excess falls to undetectable levels well below cloud base where other temperature patterns have been observed. The nature of these thermals and the origin of the fair weather cumuli are discussed.