A SPECIAL plankton meeting was held by the International Council for the Explora tion of the Sea in May 1935. The reports are published in vol. 95 of the Proceedings recently published. The papers by F. S. Russell and A. C. Hardy give an excellent picture of some aspects and methods of plankton research. H. Hoglund and S. Landberg report on investigations upon photo synthesis of phytoplankton by constant illumination, and B. Schulz on hydrographical problems.