Subseries consists of unpublished writings, arranged by subject. This sub-series includes lecture notes, unfinished jobs, and some published writings. In addition, W/US 33, 34 and 35 consist of similar material which was found loose in Dr. Penfield's office after his death. (W/US = Writings / Unpublished by Subject)

This sub-series consists of records generated by Wilder Penfield as Director of the Montreal Neurological Institute. This consists primarily of correspondence and reports about teaching curricula, budgetary information, maintenance, staff concerns, and general university affairs created through his activities with the administration of McGill University (Deans of the Faculty of Medicine and the Faculty of Graduate Studies and Research, Office of the Comptroller/Bursar, Presidents of the University, etc.).

Subseries consists of visual material Dr. Penfield used to illustrate his writings. (W/V = Writings / Visual)

Subseries consists of general pictorial records concerning Dr. Penfield, the Montreal Neurological Institute, and other individuals in the field of neurology. (E/V = Events / Visual)

Subseries consists of biographical and iconographic data on individuals, found in vertical, alphabetical files.

Subseries consists of clippings, memorabilia and pictures, filed chronologically by date, i.e. year-month-day (E/K 70-5-16).

Subseries consists of glass microscope slides.

Subseries consists of files containing additional material used by Dr. Penfield in the production of some of his published articles.

Subseries consists of card indexes of Dr. Penfield's writings. These indexes were produced by Dr. Penfield himself.

Sub-series consists of general correspondence, essentially inactive files kept for reference (C/G = Correspondence General).