The fonds documents Dr. Hamish McIntosh's activities while studying medicine at McGill University from 1939 to 1943. The fonds contains his notes.

The fonds consists of two bound volumes of notes on Endocrinology (some handwritten, some typed) from 1938-1939 and 1941-1942 while Masson was a PhD candidate at McGill University. Lectures given by: J. S. L. Browne, H. Selye, D. L. Thomson, C. F. Denstedt, C. Lyman Duff, C. P. Leblond, D. McEachern, R. L. Noble. Also included are three volumes of published works.

The fonds also consists of three bound volumes of Masson's published work from various medical journals (published in France, Canada, and USA) between 1932-1959. The articles are mostly in English, and some are in French.