This collection reflects Henry S. Chapman's relationships with a number of important figures in Montreal's political and business history, between roughly 1833 and 1853, the period following Chapman's return to London. A significant amount of the material in this collection is related to the 1837-1838 Upper and Lower Canada Rebellions (especially in Montreal), as well as events occurring immediately after the uprisings.

Consists of copies of original material, chiefly correspondence, arranged roughly by date. The contents of letters (1835-1853) include business partnerships, political reform, and personal news. Significant correspondents include Louis-Joseph Papineau, Louis-Hippolyte La Fontaine, Jacob Dewitt, François-Antoine Larocque (of Laroque and Bernard), Joseph Perreault, and Edmund Bailey O’Callaghan. There is also a partial manuscript on Canadian history and pages from a scrapbook, both dating from the 1830s.

Contains copies of fur trade documents bearing on the Mandan-Hidatsa trade with North West Company posts in central Canada, 1793-1805. Includes the journals of John Macdonell (McGill), David Thompson (Archives of Ontario), François-Antoine Larocque (LAC & Université de Montréal, Baby Collection. Draft before publication of: Early fur trade on the Northern Plains: Canadian traders among the Mandan and Hidatsa Indians, 1738-1818 : the narratives of John Macdonell, David Thompson, Franc̦ois-Antoine Larocque, and Charles McKenzie / edited and with an introduction by W. Raymond Wood and Thomas D. Thiessen. Norman: University of Oklahoma Press, c1985.