attempted to cover metabolic matters already reviewed in Volumes I and II of The Biochemistry and Physiology of Protozoa (eds. Lwoff, and Lwoff and Hutner). To those interested in the broader aspects of photo- synthesis and photoreception, reference is made to Photosynthesis and Related Processes, Volume I, and parts I and 2 of Volume II, by E. Rabinowitch; the Brookhaven Symposium on The Photochemical Ap- paratus: Its Structure and Function (1959);...