Fonds relates almost entirely to Reilley’s career as a university teacher and research scientist. Teaching materials consist of lecture notes and examination questions for his courses on heat, light and sound, as well as materials for a popular course on the general principles of science. Papers illustrating his research interests are grouped around two topics, fire and noise. Tables, notes, photographs, reports and correspondence concern his experiments in using gypsum and gyprock as flame-proof building materials (1930-1932). Notebooks record his survey of noise levels on Bleury and St. Catherine Streets (1930-1938), and notes and correspondence document his research on the acoustics of public buildings (1929-1936). A hospital administration course designed by Gerhart Hertman, but based on Reilley's work, concentrates on the twin problems of insulation and acoustics (1939). There are also files of printed background material on noise pollution.