Distinguished for work in physical chemistry and its application to industry. His early work on metallic hydroxy-acid complexes led to generalisations applicable over a wide range of metallic elements and aliphatic and aromatic compounds. Later, working for a group of .Australian mining companies, he elucidated many of the physical and chemical principles underlying the flotation process. His work in this field and in that of surface chemistry is freely cited in textbooks, and has found application in metallurgical plants throughout the world. A revised edition of a monograph, "Principles of Flotation", is in process of publication jointly with K.L. Sutherland. In 1939 he was entrusted with the establishment of a Division of Industrial Chemistry within the CSIRO. The laboratory he and his colleagues have built up has a world-wide reputation both for pure and applied research.