The fonds contains the company's business correspondence related to the importation of food products, essences, and spices from international manufacturers, and other business expenditures, as well as some correspondence with government regulators regarding food labeling and quality. In addition, some letters are from charitable and cultural organizations to which the company donated. Some personal correspondence of Henri Jonas is included, as well as numerous restaurant bills and and menus, including for the Montreal Hunt Club.

Chiefly found is incoming correspondence with product suppliers and invoices for various services, including car repair, advertising, stationary, funeral arrangements, and photography. Suppliers include companies from France, Germany, Norway, UK, Italy, Sicily, Hungary, China, India, and Spain. Products include essential oils, soaps and luxury food products such as sardines, truffles, preserves, jam, Hungarian paprika, Chinese tea, olive oil, caviar, liqueurs, foie gras, sardines, and ketchup. Two Montreal-area manufacturers are represented, with a catalogue from Couvrette Sauriol Limitée (1937) and a brochure for the Stuart Brothers. Included is one letter from postwar France soliciting renewed a commercial relationship following the allied victory (Royal Champignon). There are also bulletins from and correspondence with, including one outgoing letter, the Canadian Department of Agriculture regarding quality and labelling of canned fruits and vegetables.

A few letters are personal in nature and addressed to Henri Jonas himself. There are also telegrams and letters from Canadian organizations such as the Pacific Railway Company, and Canadian societies and organizations to which the company donated money (Canadian Society for the Prevention of Cruelty to Animals, Montreal Orchestra, Hospital for Sick Children London, Salvation Army, McGill University Centennial Endowment).

Some of the company's advertising materials are also found, as well as food labels for products including mushrooms, wine, truffles, olive oil, sardines, and lemonade).

Includes one letter (in French) to the Hon. Roderick Mackenzie from his son, Roderick-Charles. Letter discusses Mr. Gibbs' loss (a fire burned down his premises), arson in New York and the southern cities in the Union, and provides interesting commentary on social life in Montreal.

Letter from Sir John Colborne addressed to the Officer of the United States Army in command at St. Albans. With a petition granted by Colborne to Benoit Lallie, 1 May 1840, to keep a ferry on the Ottawa River at Ste. Rose (includes English and French versions of the petition.

Contains one ledger book (cashbook), half-filled, for Blackwood who was a retailer in Montréal.

File consists of an autograph letter from Abraham to 'Henderson', describing an 8-day journey across the northern United States and Canada, made in order to undertake research into purchasing of the Montreal Gazette newspaper.

File consists of an autograph letter from Abraham to his brother, John Abraham of Liverpool, including a discussion of sherry and rice pudding, and describing his 'precarious' situation.

File consists of a copy of the Montreal Gazette, vol. LI number 50.

Consists of a letter from Thomas Leigh Goldie to Captain Alexander Mackenzie.