Charles Stacy French: A tribute

Charles Stacy French, one of the great men of photosynthesis research, died on 13 October 1995. He received his PhD at Harvard University where he associated with William Arnold, Caryl Haskins, later president of the Carnegie Institution of Washington, and Pei-Sung Tang. He did early work on the photosynthesis of photosynthetic bacteria with Robert Emerson and later with Otto Warburg. French worked for three years with James Franck in Chicago. His associates there included Hans Gaffron, Robert Livingston, Warren Butler and Roderick Clayton. After spending three years at the University of Minnesota he became the director of the Department of Plant Biology of the Carnegie Institution of Washington and remained there until he retired in 1973. French's research career at the Carnegie Institution was marked by the development of novel and ingenious pieces of equipment such as the French pressure cell used to prepare chloroplast particles to measure partial reactions of photosynthesis. He developed the first recording fluorescence spectrophotometer and demonstrated efficient energy transfer between certain photosynthetically-active pigments, a spectrophotometer that measured the first derivative of absorbance, as well as a novel analog computer to show that complex absorption curves in living plants are produced by a number of distinct forms of chlorophyll occurring in vivo. French used the Blinks rate-measuring oxygen electrode to measure action spectra of oxygen evolution by photosynthesis automatically. He and Jack Myers did some of the pioneering work on the Emerson effect showing the necessary cooperation of two photosystems in photosynthesis. French used the Carnegie Institution's fellowship program to bring large numbers of scientists from around the world to his laboratory. When Stacy French died in 1995, the field of photosynthesis lost one of its great and early pioneers.This is CIW/DPB publication No. 1314.