Sub-series includes all of Dr. Penfield's "correspondence-domestic", or personal correspondence, which was taken mostly from his office at the Montreal Neurological Institute. There are also files that were taken from his home rather than his office (these were previously indicated by the prefix "D" in the file number). 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 files containing additional material used by Dr. Penfield in the production of some of his published articles.

Sub-series consists of bound appointment diaries used by Dr. Penfield to kep track of both his personal and professional engagements between 1930 and 1976.

This series contains several of Dr. Penfield's personal appointment diaries, and several diaries of his wife, Helen Kermott Penfiedl. It also currently includes a photograph album from 1913-1916, a scrapbook from Dr. Penfield's time at Galahad School (1905), some miscellaneous material collected by Dr. William Feindel concerning Dr. Penfield and the Montreal Neurological Institute, and an old reprint mailing list compiled by Dr. Penfield.

Subseries consists of bound appointment diaries used by Dr. Penfield to keep track of both his personal and professional engagements between 1957 and 1971. Given the number of blank pages in many of the diaries, it is likely that Dr. Penfield did not consistently record his engagements in the diaries.

Subseries consists of glass microscope slides.

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

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

Subseries consists of unpublished writings, arranged by subject.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 (W/US = Writings / Unpublished by Subject)

Subseries consists of unpublished writings, including talks, addresses, articles, unfinished papers, etc. many of which are printed or published, in full or in part, in some other form and filed elsewhere. (W/U = Writings / Unpublished)