Organic Peroxides in Radiobiology. A Colloquium. General Editor, M. Haissinsky. pp. vi + 153, 1958 (London, Pergamon Press), 60s.Actions Chemiques et Biologiques des Radiationsis the third instalment of the excellent series of review articles which Dr. Haissinsky is editing. Milton Burton writes on the “Radiolysis of Organic Liquids”, A. Chapiro and M. Magat on “Polymerisations induced by Ionizing Radiations”, and A. Charlesby on the “Effects of High Energy Radiations on Polymers”.