Includes bibliographies.; J. H. de Boer and the inorganic and physical chemistry.--J. H. de Boer and heterogeneous catalysis.--Studies on pore systems in adsorbents and catalysts, by J. C. P. Broekhoff and B. G. Linsen.--Mobility and adsorption on homogeneous surfaces. A theoretical and experimental study, by J. C. P. Broekhoff and R. H. van Dongen.--Some recent applications of the calculation of the entropy of the adsorbed phase according to de Boer, by J. J. F. Scholten and S. Kruyer.--Active alumina, by B. C. Lippens and J. J. Steggerda.--Porous silica, by C. Okkerse.--Active magnesia, by W. F. N. M. de Vleesschauwer.--Formation, preparation and properties of hydrous zirconia, by H. Th. Rijnten.--Hydrolytic phenomena in U(VI)-precipitation, by M. E. A. Hermans.--The texture and the surface chemistry of carbons, by Th. van der Plas.--Structure and activity of silica-supported nickel catalysts, by J. W. E. Coenen and B. G. Linsen.--Interaction of oxygen with tungsten and molybdenum surfaces, by J. W. Geus.