Dedicated to R. G. W. Norrish. Includes bibliographies.; The contributions of R. G. W. Norrish to photochemistry, by W. A. Noyes, Jr.--The contributions of R. G. W. Norrish to combustion, by B. Lewis.--Photochemistry in the liquid phase, by C. H. Bamford and R. P. Wayne.--Gaseous photochlorination, by F. S. Dainton and P. B. Ayscough.--Flash photolytic studies of free radicals, by B. A. Thrush.--Energy transfer in molecular collisions, by A. B. Callear.--Polymer chemistry, by J. C. Bevington.--Modern concepts of the mechanism of hydrocarbon oxidation in the gas-phase, by N. N. Semenov.--The interpretation of cool flame and low-temperature combustion phenomena, by J. H. Knox.--The sensitization and inhibition of ignitions, by P. G. Ashmore.--The pyrolyses of paraffins, by J. H. Purnell and C. P. Quinn.