This series consists of patient records started and/or consulted between 1939 and 1969, but not consulted after 1969. Each file is stored in a 4x6" envelope. Most of the files contain heart sounds diagrams drawn by Dr. Segall, 6x12'' clinical history forms, sections of electrocardiograms attached to dated cards, as well as 4x6" normal heart sounds record forms completed by Dr. Segall, which are often accompanied by sections of electrocardiogram readings. Many files also contain correspondence between Dr. Segall and other doctors, medical institutions, and health insurance companies, and occasionally correspondence between Dr. Segall and the patient and/or the patient's family.

This series consists of rolled electrocardiograms taken of various patients.

Series consists of files loosely arranged by subject or alphabetically by correspondent. Includes some patient records, electrocardiograms, and other clinical material. Also includes some accounting records and society or association records.

This series contains correspondence between Dr. Penfield and friends and colleagues, as well as social and professional institutions. The series' contents were found at the Montreal Neurological Institute in 2008, and thus, were not included with original correspondence series (Series C) of the Penfield Archive. The records in this series have been catalogued at the item level.

Series contains extra copies of 68 clinical reports printed on Dr. Segall's stationary from the Medical Arts Building. Some of the reports contain sections of electrocardiograms in addition to other information.

Series consists of two sketchbooks (1840s?) with caricatures of John Goodsir, Alexander Munro, Robert Knox and William Robertson kept by E. D. Worthington while a medical student, as well as related items.

Series F contains slides concerning the examination of brain swelling, acetylcholine experiments, gamma amino butyric acid experiments, as well as other research projects. All slides were used for lectures presented for the Montreal Neurological Institute and the Department of Biochemistry, McGill University, and the University of Pennsylvania. This sub-series is comprised of 22 files (no. 181 to 200).