John Chalk is distinguished for his researches in the theory of numbers, especially the geometry of numbers, and in the theory of convex bodies. He stressed the importance of the 'basic minimum' of an algebraic form with respect to a lattice, and has obtained the best upper bounds for these minima available to-day. His work has greatly added to our geometrical understanding of convex bodies. Recently, he has made valuable contributions to the theory of discrete subgroups of classical groups.

Dr. George Edward Connell has earned wide recognition for the quality of his research through important publications dealing with the biological consequences of changes in protein structure. Earlier work on the enzyme glutamyl cyclotransferase and on bacterial peptides opened new areas of research. Studies of the human haptoglobins provided one of the first examples of gene fusion. His research on the structure of the immunoglobulins has led to knowledge of great importance. Dr. Connell has contributed unselfishly to society as a journal editor, a leader in professional groups and a consultant to national organizations. He is a respected teacher, student counsellor and colleague.

Oliver Edward Edwards is Associate Research Officer, Division of Pure Chemistry, National Research Council. His early work with Professor Hurd led to a critical appraisal of Pictet and Castain's claim to have prepared 1,2-anhydroglucose, to the discovery of some interesting thermal isomerization and dehydration of dihydroxydihydropyran, and to the discovery and interpretation of some unusual reactions of lead tetraacetate with dihydropyran. His most important work has been in the field of alkaloids and indeed his contribution is outstanding. His major structural studies on aconite and delphinium alkaloids, started in 1950, have resulted in the discovery of an array of unusual reactions of the alkaloid lycoctonine which have been interpreted in the light of the complex structure of this base determined by X-ray crystallography. He has also contributed substantially to our knowledge of the structure of the alkaloid atisine, as well as doing first-rate work on unrelated alkaloids.

Peter Allan Forsyth is Professor of Physics, University of Saskatchewan. After seeing active service as a technical officer with the navy during the war, he returned to the University of Saskatchewan to apply his detailed knowledge of practical experience of radar equipment to the study of the aurora, and it was on this subject that he wrote his Ph.D. thesis at McGill University in 1951. Continuing his work on the upper atmosphere with the Defense Research Board he made notable discoveries; in particular, he developed the system of transmission of radio signals from meteor ionization known as 'Janet'. His originality and inventiveness have stimulated many other research workers.

George David Garland is a geophysicist who has achieved an international reputation for his work in comparing standards of gravity between Europe and North America and among Alaska, Canada, the United States, and Mexico. He has made observations and geological interpretations of the gravity and magnetic fields in various parts of Canada. More recently he has initiated work on studies of heat flow in the Western Canada Sedimentary Basin. He is now Associate Professor of Geophysics at the University of Alberta.

Has established an international reputation for his imaginative and far-reaching researches on (1) the physical chemistry of cellulose, hemicelluloses and lignin both in solution and in the solid state, (2) the topochemistry of delignification using UV microspectrophotometry (3) the structure of water and (4) the hydrodynamic behaviour of polymers and polyelectrolytes. He is undoubtedly the foremost physical chemist in Canada (if not in the world) working on the chemistry of wood and its constituents. In addition he has contributed substantially to the training of graduate students.

Although by inclination and interest primarily a theoretical physicist, Professor Haering also does excellent experimental work and his papers are characterized by a lively interplay between theory and experiment. He is best known for his work on the Zeeman effect in Germanium. ultrasonics in metals and his prediction of the existence of a Doppler-shifted cyclotron resonance in metals which was later detected by Kirsch and Redfield. At Simon Fraser University, his energy, enthusiasm and ability to stimulate others has enabled him, in a few years, to develop one of the strongest solid state physics groups in Canada.

Geoffrey Francis HATTERSLEY-SMITH, a member of the Geophysics Section of the Defence Research Board, Ottawa, has carried out distinguished studies in glaciology and oceanography in the Canadian Arctic for the past twenty years. During this time he has been eminent not only in the field, but also by his work on various national and international committees concerned with problems of the Earth Sciences. Hattersley-Smith's work in Ellesmere Island was recognized by the award of the Founder's Medal of the Royal Geographical Society in 1966, one of two gold medals given annually by the Sovereign on the recommendation of the Society's Council.

lan Brent Heath, one of Canada's most innovative cell biologists, has elucidated the role of the cytoskeleton in the intracellular mechanics of fungal and plant cells. This work is of central importance because almost all aspects of the biology of these organisms is controlled by the cytoskeleton. He pioneered the use of electron microscopy for functional and phylogenetic studies of fungal and protist cell division. Heath is now introducing innovative concepts to the process of tip-growth, the hallmark of the fungi. He has been awarded the Huxley Memorial Medal for Research Excellence by the Imperial College.