The series includes two manuscripts by Lockerby's mother, Barbara Cox, identified as composition exercises: one entitled 'Thoughts on Natural Philosophy' and dated 1865 argues the importance of advancing scientific knowledge and discusses the telescope, microscope, daguerreotype, electricity, etc.; the other dated 1868 discusses man's 'ruling passions'. Also included are a number of invoices and receipts relating to the Lockerby household 1868-1930: included are records of the purchase of a William Notman photograph of Barbara Cox by A.L. Lockerby 1871, women's jewellry 1875, baby clothes June 1880, graveyard expenses for the child David Alex Charles Lockerby June 1880, travel expenses to the United States July 1880, piano Dec. 1880, disinfection of house 1884, piano 1886, furniture removal and farm produce in Valois 1892, casket 1893, etc.
The series also includes memorabilia relating to the war service of Mabel Lockerby's cousin, and reputed beau, Ernest McNown, who enlisted with the First Canadian Division in 1914 to serve in Canadian Expeditionary Force in the First World War. Included is a postcard to Mabel Lockerby's brother-in-law Harry Mullan, 1914; dinner programme for the Empire Lodge dinner for Freemasons of the Overseas Contingent 1914; a rendering of the Allied flags on silk with an accompanying inscription from Queen Mary and the Women of the Empire 1914; memorabilia re. the ships RMS Carmania and RMS Franconia; Christmas greetings from Canon F.G. Scott 1915; a letter to McNown from Mabel's father A.L. Lockerby 1915; programme 'Final Order of the Day' for demobilization ceremony of the First Canadian Division 1919 (with McNown's sarcastic annotations) and his discharge certificate, 1919, from the Canadian Machine Gun Corps in the First Battalion; records of his being awarded a Military Medal; souvenir menu from a Military Ball Supper in honour of the Prince of Wales, Montreal, 1919; and miscellaneous printed material.