The fonds consists mainly of a bound notebook that Mussen kept with notes on his experimental investigations. Includes mounted photographs of brain specimens and animal subjects. Fonds also contains loose manuscript notes and two overhead projector transparencies.
The fonds includes American Neurological Association material (1934-1941), army files (1939-1943), correspondence, lecture notes, glass slides, large glass negatives, colour screen filters, and reprints with a card index.
Fonds contains Frederick Holland Mackay's lecture notes from several courses of medicine for the session 1910-1911. They are W.F. Hamilton on medicine, H.A. Lafleur on the respiratory system, C.F. Martin on neurology and F.G. Finlay on heart conditions. The fonds includes one student notebook with an inscription from W.W. Francis and Mackay to W.W. Francis.
The Penfield fonds consists of over eighty metres of Penfield's personal and professional records dating from his childhood up until his death in 1976, including during his career at the Montreal Neurological Institute. The materials in the fonds include photographs, correspondence, manuscripts and drafts of publications and speeches, research notes, glass slides, bound reports, films, and academic gowns.