Presents background information on Dixy Lee Ray, chairman of the Atomic Energy Commission, and on Elizabeth Scholtz, director of the Brooklyn Botanic Garden. (PS)

Research in photosynthesis is revealing a number of possible ways to increase the efficiency of carbon dioxide assimilation by crops and thus increase yields, a necessity in times of growing population and shrinking agricultural land. (Author/BB)

Describes experiments demonstrating that root pressure in plants is probably controlled by a circadian rhythm (biological clock). Root pressure phenomenon plays significant part in water transport in contradiction with prevalent belief. (PS)