The fonds derive from his active work in associations and at McGill University and consists of correspondence, minutes and agendas of meetings, reports and documents with various professional associations and committees, showing his involvement and interest in meteorology and physics. At the University, his correspondence is mainly for the University administration (1967-1969), the Physics Department, the McGill Associations of McGill Teachers (1968-1969) and the Visiting Committee (1967-1969). Included are his physics notes and laboratory reports as a student at the University of Toronto, student photographs, laboratory notebooks in Physics and Mathematics, teaching aids consisting of transparencies and notes for lectures, reprints and drafts of his writings mainly about hailstorms, the ozone and weather radar (1951-1986). The collection also contains group portraits of the Physics Department at McGill and University of Toronto. In addition, there are Dr. Hitschfeld's notes on experiments and observations, including photographs, on radar (1950's), tornadoes (1955) and the ozone (1960's). Films of scientific experiments also form part of the funds.