Robert H. Marchessault, Xerox Research of Canada Limited, Mississauga, Ontario, is an oustanding scholar of international repute in the physical chemistry of natural and synthetic polymers, particularly cellulose, starch, and stereospecific polymers. He has made many pioneering applications of physical techniques (old and new) in elucidating molecular structure and conformation, plate-like crystalline morphology, as well as other chemical and physical properties of macromolecules of industrial and biological importance. As Vice-President (Research) of Xerox he still somehow manages to continue his research.

Professor Jerrold Marsden is known worldwide for his applications of modern mathematics, particularly differential equations, to many branches of classical quantum and relativistic mechanics. He has made substantial contributions to the mathematical foundations of mechanics, the geometrization of fluid mechanics, and Hamiltonian and general dynamical systems, including the momentum map. Among nonlinear problems he has written extensively on stability and bifurcation, nonlinear elasticity, chaos, and, in extensive collaboration on the solution spaces of relativistic field theories wherein the singularities were proved quadratic. His prolific output maintains prizewinning quality, as evidenced by the Humboldt and Norbert Wiener awards.

The theme of Dr. Jacob H. Masliyah's research and development activities over the past two decades has been the behaviour of 'flowing particles and fluids'. His work has ranged from fundamental research in fluid mechanics to highly applied research related to the extraction of bitumen from the Alberta oil sands. He carried out pioneering studies on fluid flow and heat transfer from particles submerged in flowing fluids. His general correlation for the drag force on axisymmetric particles is now included in the most widely used handbook for chemical engineers. He also carried out extensive studies on heat and mass transfer from flat plates due to impinging air jets using double-exposure and real time holography methods. His work on flow through coiled pipes and ducts is well known internationally. The most unique aspect of Dr. Masliyah's work has been his ability to bring rigorous analysis, based on fundamentals, to bear on his applied research projects. Over the last fifteen years, many of his fundamental and applied research ideas have been inspired by the challenge of improving the efficiency of bitumen extraction from oil sands using the Clark hot water process. He has made major contributions dealing with rotating tumblers, inclined plate settlers, flotation columns, and slurry behaviour. His success in research has brought significant benefits to the oil sands industry, assisting in the understanding of the operation of existing plant equipment and providing definitive methods for the design of new plants. As a consequence, the industry's capability to develop and evaluate new oil sands extraction schemes has been dramatically improved. He has published about 120 refereed journal articles and a book on 'Electrokinetic Transport Phenomena'. He is presently working on another book dealing with 'Transport Phenomena in Fluid-Solid' systems.

Dr. W.H. Mathews has been a leader in the Earth Sciences for 46 years. In that span he has published one hundred twenty-one papers on his research, averaging 2.7 papers per year for 46 years. These span an astonishing range of expertise. Mathews is an internationally known expert in glaciology, volcanology, geomorphology, landslide hazards, and well known for his contributions to coal geology and economic geology. His work on flash floods of glacial origin is a classic, as is his work, with K.C. McTaggart on the Hope Landslide. The mechanics of glacial flow were first documented by Dr. Mathews on the Salmon Glacier. There are few geologists today like Dr. Mathews, who can carry on a high level conversation with any earth scientist, from petrologist, to glaciologist, to volcanologist, to hydrologist and to economic geologist.

Gordon A. McBean, Chairman, Atmospheric Science, Department of Geography, University of British Columbia, is a world authority on the atmospheric boundary layer. His research on atmospheric turbulence identified the importance of active-passive scalars and stability on turbulent transfers. Other research includes air-sea interactions, marine storms and climate change. Leadership hs been provided for many national and international programs and he has given guest lectures around the world. Dr. McBean was the key designer of the Global Energy and Water Cycle Experiment and was elected in 1988 to the prestigious position of Chairman, Joint Scientific Committee for the World Climate Research Programme.

Robert A. McClelland is internationally recognized in two areas of research, in Physical Organic Chemistry for his fundamental studies of short-lived species of central importance in several types of common organic and bioorganic reactions, and in Medicinal Chemistry for his elucidation of the mechanisms of chemical and biological action of bioreductive drugs employed in the treatment of cancer. The research in both areas has been characterized by pioneering apporaches based upon the actual preparation of reactive intermediates or metabolites, so that their properties can be evaluated by direct investigation, and not by indirect means.

Dr. Margaret McCully is a plant scientist with an international reutation for outstanding research in the fields of plant histology and plant development. Her work on the fine structure of the brown algae and the developmental histology of maize roots is first class and she has contributed many histochemical techniques for improving plant microscopy. Especially notable is her recent study of the morphology and functioning of maize roots and their rhizospheres in field grown situations, which has provided much new information on root: soil: microorganism interrelationships. Dr. McCully has published extensively in international journals of the highest repute and is co-author of two excellent books dealing with 'Plant Structure and Development'. She is an outstanding scientist who has contributed significantly to plant science in Canada and is eminently worthy of election to a Fellowship in the Royal Society of Canada.

Charles A. McDowell's many publications have contributed significantly to three main fields: ionization and dissociation of molecules by electron impact, mechanisms of gas-phase oxidation reactions, and electron spin resonance spectroscopy of free radicals. His determinations of the energy levels and electronic structures of molecular ions provided the first experimental assessment of theories of the electronic structure of molecules. His work clarified the nature of hydrocarbon oxidations. He has identified the radicals formed in organic crystals subjected to radiation. He came to Canada from Britain in 1955, and his vigorous leadership has contributed greatly to the development of chemistry at the University of British Columbia.

Dr. McKellar has carried out distinguished work in many areas of high resolution infrared spectroscopy. He has studied can der Waals complexes of H2 and the rare gases, providing precise information on their inter-molecular potentials. Recently he obtained the first experimental verification of the presence of hydrogen dimers on Jupiter. He has developed the techniques of laser magnetic resonance and laser Stark spectroscopy using CO and CO2 lasers and has obtained infrared spectra of many free radicals e.g. FO, CH2, NH2, as well as molecular ions e.g. H3+, HCO+, HN2+. His work on the experimental determination of the singlet-triplet splitting in CH2 is especially noteworthy.

Dr. Hugh McLennan received his academic training at McGill University obtaining a B.Sc. (Honours chemistry) in 1947 and a Ph.D. in 1951. He has recently been recommended for promotion to full professor of physiology at the University of British Columbia. He is an imaginative and productive scientist, and has an international reputation for his work on synaptic transmission in the central nervous system of vertebrates with particular emphasis on inhibition. His monograph on Synaptic Transmission is an inportant contribution to the field and has been well received. Recently, he has developed an ingenious technique for brain stimulation and recording in unrestrained animals, and is applying this to the study of behaviour in cats. Dr. McLennan is an excellent teacher and a mature, competent investigator who has contributed much to Canadian Science.