The substantial catalogues series covers most of the inventory of both the Society’s museum and library. Museum catalogues provide detailed information regarding the genus, species and origin of their Mammalia Collection while catalogues of donations to the museum also point to interesting objects in their collection. Library catalogues list publications in the Society’s holdings. The series also provides important lists related to the Journals of Assembly and to the visitors of the museum.

The essays and lectures series is a small collection of published or handwritten documents amassed by the Society. The first essay (file 4.5), submitted by Thomas Stratton, is a handwritten document on the similarities of Gaelic and Latin. The second document (file 10.6) is the transcription of a lecture delivered by Major R. Lachlan on the progress of the Society to 1852.

The last document (file 10.7) is a copy of an essay which was awarded The Prize Medal of the Society for the Encouragement of Arts and Sciences in Canada.

Consists of a collection of records relating to Charles Lewis's father's records (also named Charles Lewis).

The series contains letters written to Robert Abraham by Thomas Carrick and John Gibson.

The series contains letters written or received by John Abraham.

The papers of Margaret Mercer Dawson consist of 6 cm of letters from her husband, 1848-1873; 14 cm from her children, 1858-1906, including a majority of letters from Anna Harrington; 13 cm from her Scottish relatives and friends, 1836-1907, including Peter Bell, Isabella Hall, Marion Mercer, and Walter Mercer ; and 35 cm (approximately one-third undated) from friends, 1855-1906, including J. Sybil Wilson. All of the letters are incoming correspondence to Margaret Mercer Dawson.

This series contains McGill publications, student publications, published material about McGill, and some unpublished material, representing the activities of McGill’s students and staff between 1838 and 2019.

This series is described at the file level. McGill publications include calendars, reports, handbooks, directories, newsletters, promotional materials, texts of speeches, academic publications, and other similar material. Student publications include yearbooks, newspapers, handbooks, songbooks, literary journals, magazines and newsletters, biographies, histories, and other documents. Published material about McGill consists of clippings from newspapers and magazines. Unpublished material includes correspondence and some fliers.

Much of the material contained within this series is concerned with the history of McGill's Chemistry Department. Because the majority of material is research related the contents of this series are dominated by xeroxed research materials, holograph research notes, and photographs.