The report of selected biological references on water pollution control include a number of related topics ranging from specific groups of organisms to those techniques used to determine changes in the environment and methods used in reporting data. Much literature is of relatively recent origin. The general expansion of the biological field, the introduction of new factors for consideration, e.g., radioactivity, new insecticides, and a wide range of pollutants for bio-assay, have stimulated research on the short- and long-range impact of these materials.