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

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).

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 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 includes a letter addressed to Mackenzie, Oldham & Co. from Parker, Gerrard, Ogilvy & Co., ordering three to four hundred quintals of biscuit to be delivered at the End of the Island.

File includes two letters addressed to Henry McKenzie from D. Ogden. The first letter refers to a letter on the subject of the Frobisher Estate and says that McKenzie may forward it to Ben Frobisher. In the second letter, Ogden gives his opinion on the matter of McKenzie's purchase of McKay's house in Terrebonne.

Consists of a statement from the Keerper of the Common Gaol of Montreal presented to the Grand Jury of the Court of Oyer & Terminer for the District of Montreal, 1821. The statement declares that the prison under itscurrent configuration is inadequate for the increasing number of prisoners that have been lodged therein rendering it almost impossible to separate different classes of prisoners. The Keeper, Peter Holt, requests that the lower part of the prison ought to be restored to its original use and reunited to the Common Gaol to create more space for prisoners.

Includes two letters sent to Mackenzie, Oldham & Co. The first letter mentions getting 500 barrels of flour for Angus Shaw's posts and 100 barrels for themselves and discusses the possible hiring or purchase of the Desire (N.W. & Co. ship) by Mackenzie, Oldham & Co. The second letter mentions that Mr. Shaw wants to know whether they will be needing one of the vessels belonging to the King's Posts to bring down the flour.

Includes four letters sent to Mackenzie, Oldham & Co. The first letter requests that the Quebec merchants Burns & Woolsey hire a vessel for trade with Newfoundland. The second mentions waiting for the boat and articles paid by Caldwell, Fraser & Co. The third relates to the proper form of the certificates for half the pay of Capt. Osborne and Lieut. Fraser. The fourth relates to the contract for flour and mentions John Well(e)s who has just arrived with information that the Treaty of Trade & Commerce between Great Britain and the United States had been signed in London on Dec. 31st.

File include a copy of a letter from McTavish, Frobisher & Co. to Alexander Fraser of the North West Company. Letter regarding the posts below Quebec lately added to the Company; intended adventure of Capt. Richards to Hudson's Bay; Angus Shaw's appointment be sufficient had he only the King's posts; Mr. Grant refuses to give up the lease at Mingan; insisting that Alex. Fraser maintain the King's posts one more year before returning to the North West; Angus Shaw to go across the country by Lac Mistassini & meet the vessel at Hudson's Bay & Co.