DR. H. C. REDEKE has Written a useful summary of the result of recent investigations upon the subject of river pollution for the International Council for the Exploration of the Sea (Rapports et Procès-Verbaux des Réunions, vol. 43, May. Copenhagen: Andr. Fred. H0st et Fils, 1927). The direct influence upon fishes of sewage and of trade wastes containing organic matter or inorganic poisons, is discussed, and the methods used in treating the various pollutions on the Continent, in America, and in Great Britain are outlined. The report contains a comprehensive bibliography.