The fonds consists of bound book of company records from the years 1893 to 1897. Later on the book was used as a scrapbook including newspaper clippings from the wars (1914-1951).

These McGill papers are entirely concerned with his property and estate. They comprise legal documents and copies of letters (some in McGill's hand) concerning his land holdings on St. Paul St., Montréal, in Stanbridge, and in Detroit. McGill's cash book, 1809-1815, and copy by W.D. Lighthall of a deed of conveyance to McGill of some land formerly occupied by the city fortifications, 1805, are also included, as is a blue-print and sketch by W.D. Lighthall of the site of McGill's St. Paul St. house. Estate papers comprise a probate of McGill's will, copied by Alice Lighthall, and his executor's cash book.

These papers comprise copies of addresses delivered to the Society.

The fonds consists of two letters from James Mills to Principal Sir Arthur Currie dated July 31 and August 5 1922. Both letters refer to the appointment of a principal to Macdonald College and the July letter has a typed copy with lines underlined in red ink. Included is a note from Currie to E.W . Beatty stating that a copy of the Mills letter was enclosed.

"Architectural Drawing, n.d., 1 drawing". Included is a drawing in the archive of the façade of the American Presbyterian Church on St. James Street in Montreal. This drawing has not been described

"Dessin architectural, s.d., 1 dessin." Notamment un dessin de la façade de l'église American Presbyterian, sur la rue Saint-Jacques à Montréal. Ce dessin n'a pas encore été décrit.

This author's manuscript of What he cost her (1877), contains corrections.

Fond contains solely glass slide negatives. Many slides depict the McGill campus between the years 1918-1921, including the Strathcona Medical Building, as well as the Royal Victoria Hospital. Other subjects include street scenes taken in Montreal after the end of the First World War and the Lockharts' family life during the early 1920s.

"Architectural Drawings, 1894, 4 drawings." Included are drawings for an addition to the house of Arthur E. Abbott in Senneville, PQ.

"Dessins architecturaux, 1894, 4 dessins." Notamment des dessins d'une annexe à la maison d'Arthur E. Abbott de Senneville (Québec).

About half of Donald's papers consist of diaries giving brief daily records of his professional and sometimes personal activities from 1918 to 1981. The remaining files fall into two series. Essays and addresses, 1919-1962, largely on economic aspects of the chemical industry, were addressed to professional organizations and commercial bodies such as the Engineering Institute of Canada, the Canadian Chemical Association, the Canadian Chamber of Commerce, and the Industrial Development Board of Manitoba. More informal speeches include a radio talk on jobs in the chemical industry, 1938. Personal materials comprise some family, legal and investment records, 1940-1952, and undergraduate essay on medieval universities, 1910, correspondence related to an annuity fund set up by Donald for Jessie Henderson, secretary and librarian of McGill's Chemistry Department (1946-1961), and a file of press releases and congratulatory letters on Donald's receipt of the Chemical Industry Medal, 1952-1953.