Series consists chiefly of letters between Maude Abbott and her sisters, as well as other personal correspondence. One correspondent represented in the series is Dr. C. F. Martin, a McGill physician who was a friend and advisor to Abbott. Other correspondemts include Lady Osler, Archibald Malloch, Walter Chipman, Thomas McCrae, and Lady Drummond. Two letters exist from W. W. F. Francis. Two letters related to the No. 3 Canadian General Hospital (with correspondents H. S. Birkett and Edward Archibald).

This series contains of Cushing's typewritten drafts of chapters from his book, The Life of Sir William Osler. The series is arranged into files corresponding to chapter divisions.

The series consists of chiefly of letters written by Osler that Cushing collecting during the preparation of his biography, The Life of Sir William Osler, between the years of 1920 and 1924. The letters in the series include both originals and transcriptions. The series also contains accompanying notes (both by Cushing and by Osler), clippings, articles, and other ephemera related to Osler.

This series contains working papers, notes, drafts, articles, and ephemera compiled by Cushing during the preparation of his biography of Sir William Osler. The material is arranged alphabetically generally by topic or author. There are also two files of Cushing's correspondence related to the publication of the biography.

Series includes miscellaneous textual records and artefacts belonging to Charles Lewis and Beatrice Maud Young Lewis.

This series contains correspondence between Helen Kermott Penfield and Wilder Graves Penfield, as well as other friends and family between 1920 and 1932.

Series contains a collection of programmes from medical meetings, mostly those of associations. Some programmes note Maude Abbott's participation. Some are accompanied by related ephemera, including letters, invitations, or publications.

This Series consists of ten drawers of a Kardex index, each of which is approximately 52 cm long. The top five drawers consist of indexed conditions, each of which is identified by a two or three character alphanumeric code (either A1 to A45, B1 to B99, or C1 to C70). Attached to each condition in the index is a list of the electrocardiogram numbers of particular patients. Dr. Segall seems to have determined that the listed electrocardiograms represent manifestations of their corresponding Kardex index condition. The individual electrocardiograms are located in Series G and are marked with their electrocardiogram numbers, the date on which they were created, as well as the names of the patients from which they were taken.

Drawers 6 through 10 of the Kardex index (Series M) contain indexed sections for 80 different cardiac symptoms. Each of the 80 symptoms are further divided into 10 (numbered 0 to 9) different sub-sections (possibly for different variations of each symptom), each of which contains a list of the electrocardiogram numbers, often, but not always, including the numbers for electrocardiograms of the patients whose files bear that particular two to three digit numerical code. The listed electrocardiograms seem to have been determined by Dr. Segall to represent manifestations of the corresponding Kardex index symptom.

This series consists of patient records started in 1926 and not consulted after 1939. 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 that 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.