E.G. SWENSON graduated in 1946 with an M.A. in chamistry from the University of Saskatchewan where he did several years of postguaduate research in the chemistry of cemet under the late Professor T. Thorvaldson. After six years of teaching at the University of Saskatchewan Mr. Swenson joined the Division of Building Research of the National Research Council of Canada as research officer in the field of cement and concrete. In 1959 he joined an industrial firm where he developed a quality-control and research laboratory for the manufacture of cement, ready-mixed concrete, concrete block, and other precast concrete products. In 1963 he rejoined the Division of Building Research where he is continuing work in cement and concrete as a senior research officer.