This sub-series consists of various drafts of Something Hidden. The drafts are not always easy to distinguish in terms of chronological sequence, but an effort was made during the initial processing to roughly order the drafts by version and divide them by chapter. Also included are notes for additions and deletions, labeled “Adds and Outs.” At times, some research notes and primary Penfield material are interfiled with the drafts. This series also includes a draft of the screenplay for the film.

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

Sub-series includes all of Dr. Penfield's "correspondence-domestic", or personal correspondence, which was taken from his office at the Montreal Neurological Institute. This sub-series includes material which Dr. Penfield had collected before arriving at McGill in 1928. In particular, it includes correspondence between Dr. Penfield and his wife, Helen Kermott Penfield.

Subseries consists of published accounts (articles or stories). (E/P = Events / Published)

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.).

This sub-series includes the notes, drafts, correspondence, and other records Dr. Penfield produced and collected in creating his various books. (W/B = Writings / Books)

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

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