The fonds consists of correspondence, notebooks, research papers and reprints of articles by friends and colleagues. Of particular note is correspondence with Sir Ernest Rutherford, 1908-1937. Also included are Gray's stamp collection and a ledger kept by W.M. Herchmer and John R. Forsyth for the estate of Major Alexander Forbes, army officer, Kingston, Ontario. April 1851-1852, and notes on Forbes' military career made by Professor J.D. Forbes, that was acquired and retained by Gray.
Fonds consists of correspondence; subject files; memoranda; reports; published articles, papers, and addresses; and photographs, including a series of coloured 35 mm slides of various campus buildings, events, and scenes, taken by W.A. Mackintosh during his time as the 12th Principal of Queen's University. There are important files on the Anti-Combines Investigation Act, the 1945 Dominion-Provincial Conference, the Royal Commission on Dominion-Provincial Relations, the National Employment Commission, the Economic Advisory Committee, 1939-1944, and Queen's University.
