Chemical reactions carried out on an industrial scale are subject to control by processes such as mass transfer and heat transfer, which, in small-scale work, may often be reduced to negligible proportions by judicious choice of conditions. Volume 23 deals with these aspects of reaction kinetics, which must always be considered when significant scale-up is contemplated and which may be expected to be of paramount importance in industrial operations. The principles of chemical reactor design are treated in a form digestible by chemists and there is some emphasis on the way in which available kinetic data may be utilised by the chemical engineer.