Dr. Richard A. Vollenweider has played a major role in the science of limnology in both Europe and North America. His models relating the abundance of phytoplankton in lakes to inputs of phosphorus and rates of water renewal are used as the basis for managing eutrophication in the majority of the world's lakes, including the St. Lawrence Great Lakes. In 1936, he received the prestigious international Tyler Prize for this work. In earlier papers which are now classics, Vollenweider quantified the optical properties of lakes, and made several pioneering investigations in the relationship between the light attenuation in lakes and algal photosynthesis.

Gordon A. H . Walker is a gifted experimental astronomer whose scientific accomplishments have been widely recognized by astronomers at both the national and international levels. He was one of the first to demonstrate that the interstellar extinction curve shows many small scale irregularities, often related to the diffused interstellar absorption features. His measurements of the rotational velocities and equivalent widths of two helium lines still provide the most extensive and homogeneous data of this type available. His particular expertise is ancillary astronomical instrumentation, particularly the use of photoelectronic detectors and solid state sensors. He has developed a compact, four-channel, five-colour photoelectric digital photometer which has been used to measure thousands of stars. He is currently playing a major role in the Canada-France-Hawaii telescope development.

By building up a strong group of theoreticians at McGill, Philip Wallace has made a major contribution to the development of Physics in this country. His own work has been in electrodynamics, the band theory of graphite, positron annihilation and magnetoplasma waves in solids. His 1947 paper on graphite gave the first band structure calculation for a particular solid and is the standard first reference on that subject. His work on positron annihilation laid the basis for understanding the 'long lifetime' in molecular materials and its temperature variation. His series of papers on magnetoplasma waves in semiconductors are amongst the first and most important in that field. Relativity: work with L. Infeld on the extension to the paper of Einstein, Infeld and Hoffman on the derivation of equations of motion from field theory to include electromagnetism. Numerous papers on the physics of semiconductors in intense magnetic fields. Developed a self-consistent method in quantum magneto-optics which led to the discovery and study of new macroscopic quantum states. Have written three books - "Mathematical Analysis of Physical Problems" (Dover 1982), "Physics: Imagination and Reality" (World Scientific ) and "Paradoix Lost: Images of the Quantum" (Springer, 1996). Also, edited two Conference Proceedings: "Superconductivity" (Gordon and Breach 1968) and "New Developments in Superconductors" (North Holland, 1972). Member representing Canada: International Advisory Committee of biennial International Conferences on Semiconductors, Kyoto, 1980, Montpellier 1982, Warsaw 1984, Stockholm 1986. Principal of Science College, Concordia University 1984-87.

Carl Walters, Department of Zoology/Fisheries Centre, The University of British Columbia, has contributed broadly to research in population and community ecology with publications ranging from basic limnology and plankton biology to the development of models for fisheries stock assessment. He is best known for his development of methods known as adaptive management, involving the use of proper experimental design in the evaluation of renewable resource management policies. In addition to his extensive training of postgraduates in resource ecology, he regularly conducts workshops on fisheries assessment and adaptive management for government agencies around the world. He has published two books on adaptive management and fisheries stock assessment.

LAWRENCE C. H. WANG, Department of Zoology, University of Alberta, is a world leader in research on regulation of metabolism in mammals. Dr. Wang has discovered unique physiological mechanisms used by hibernating mammals to survive near freezing body temperatures. He has identified the physiological bottlenecks governing heat production in mammals exposed to cold. These bottlenecks can be circumvented by a specific combination of natural food stuffs, that block the effects of endogenous metabolic inhibitors, at the same time as helping to utilize one's own fat reserves. Dr. Wang has marketed this combination of food stuffs as the "Canadian Cold Buster".

Norman Wardlaw, Department of Geology and Geophysics, The University of Calgary, is internationally recognized for his pioneering studies of the geochemistry of salt and potash deposits and for his innovative work on the flow of oil, gas and water in petroleum reservoirs. He has carried out ground-breaking research on the geometric properties of pore spaces in reservoir rock, and has adapted image analysis techniques for the study of complex interactions of three fluids moving in pore spaces. His work is being used for predicting amounts and rate of oil and gas reservoir recovery and the design of optimum recovery systems. The work also has applications to the transport of pollutants in groundwater, a problem of profound world-wide significance.

Dr. Watson is distinguished for his work on the theory of molecular spectroscopy. His studies have led to simplifications of the fundamental Hamiltonian, recognition of specific symmetry properties, and a deeper understanding of the isotopic dependence of molecular parameters. An examination of centrifugal distortion effects led to a reduction in the number of parameters of asymmetric top molecules, and to the prediction of forbidden rotational spectra in certain non-polar molecules, including methane. His recent work includes the theory of the Jahn-Teller effect in the Rydberg states of H3 and D3, the assignment of the Schüler bands of NH4 and ND4 and the assignment of the Schuster bands of NH3 and ND3.

Alfred Weiss, Department of Mathematical Sciences, University of Alberta, is a mathematician who has made fundamental contributions to several aspects of algebraic number theory and the representation theory of groups and orders. The elegant and ingenious work of Weiss and his collaborators is ubiquitous in the study of integral group-rings and the Galois module structure of units of number fields. Renowned for the originality of his ideas, Weiss proved the long- standing Zassenhaus Conjecture concerning units in group-rings by a method which has rapidly become a ‘classic' and Weiss's solution of Frohlich's conjecture on canonical lattices of Galois representations is clearly destined to follow suit.

For the past 13 years Edward Whalley has headed a laboratory devoted to Physical Chemistry at high pressures. This laboratory is now well known throughout the world. Whalley's work has dealt with the structures of products formed at high pressures such as poly and methyl vinyl acetate, poly aldehydes, poly carbon disulphide and high pressure ices; rates of chemical reactions as a function of pressure and the use of the data obtained to explain organic reaction mechanisms; compressibilities of liquids, an extensive study of the p.v.t. properties of water and the design of high pressure equipment. His scientific work has invariably been first rate.

DOUGLAS M. WHELPDALE, Senior Scientist, Atmospheric Environment Service, Environment Canada, is an international authority on atmospheric chemistry. His fundamental work on transport and deposition of atmospheric sulphur and nitrogen has played a major role in the development of Canadian and European acid rain research programs. His recent work has focussed on large-scale cycling and budgets of atmospheric chemicals, leading to design and implementation of global atmospheric monitoring. Dr. Whelpdale chairs the influential Expert Panel on Atmospheric Chemistry and Environmental Pollution of the World Meteorological Organization. In 1987 he was awarded the Patterson Medal for his contributions to Canadian meteorology.

JAMES RENNIE WHITEHEAD is distinguished for outstanding achievement in applications of radar and in industrial science. His development of the McGill fence not only was the first major application of bistatic doppler radar, but also involved establishing a major industrial research and development laboratory in Montreal that he led for ten years in microwave radio, plasma physics, radio propagation and research satellites. His definitive text on the super-regenerative receiver was one outcome of his wartime contributions to numerous responder radar systems. Study of the microphysics of friction led to his doctorate. He served on the Royal Commission on Government Organization. His dedicated concern led to his present responsibilities for industry in Government science.