This series contains the creator's illustrations, and some prints and reprints of articles using her material. Some of them are numbered in corresponding file books. The series also contains non-medical illustrations, such as a stained glass window design for the Royal Victoria Hospital, a menu, and charcoal sketches.

This series contains correspondence, notes, lists, as well as reprints of an article about scientific illustration.

10 negatives and prints of medical illustrations - 17 illustration photos of a Wilder Penfield book.

Drafting instruments used by the creator.

These 32 illustrations are all from Hortense D. Cantlie's work at the Montreal General Hospital

Three volumes of choral sheet music from the Choir’s library were donated to McGill University by the Estate of D. Torrance Fraser, a former choir member, in 1926. The pieces in these three volumes are second copies of those pieces found in Series 1. In 1927, another volume of sheet music from the Choir’s library was donated to McGill University by the Estate of D. Torrance Fraser. This fourth volume (DTF2) contains many pieces not found in the other volumes.

Series consists chiefly of 38 manuscripts related to the North West Company. Among the Masson manuscripts there are other series of letters; as well as journals kept by North-Westers and various business documents. Some of this material exists as originals; others are contemporary copies - the George Keith letters for example are contemporary copies on paper watermarked 1827. The collection also includes some duplicate texts - contemporary copies or later nineteenth-century copies that in some cases represent edited versions of the texts. Samuel Wilcocke's account of the death of Benjamin Frobisher exists in a draft original (or contemporary copy) and in a late nineteenth-century clean copy. Of course Benjamin Frobisher did not die in the dramatic circumstances as recorded by Wilcocke, but peacefully in Quebec City in 1821.

Series consists chiefly of architectural photography from Italy and France, featuring building exteriors and exteriors and details such as doorways, crests, and capitals. Photographs are mostly undated. One file contains photographs of public buildings in the United States and one photograph of a Royal Canadian Mounted Police garage in Montreal Quebec.

Consists of 108 undated postcards in eight files of buildings in Europe; these include examples of building exteriors, interiors and details.

Series contains clippings related to projects executed by the firms, including the old Masonic Temple, the Engineers' Club house, the Windsor Hotel, a house for N. A. Timmins, and the École technique de Montréal.