The fonds consists of hand-coloured lantern slides of flowers, the movement of floral parts, fertilization and seed production, fruits, flower gardening, ornamental planting, vegetable gardening, farm scenes, potatoes, the microscopic structure of plants, landscapes (Pacific Coast, mountains, park country, plains), farms, mammals, birds, the erosion of rocks, sunsets and clouds, clouds, deposits of sand and gravel, stratification of rocks and soil, plants as soil makers, erosion of rocks, logging and lumber, and trees; glass plate negatives of the Banff area including hotels, golf courses, mountains; farm machinery; negatives of the family's farm, family members, farming, harvesting, picnics, the Drumheller area including hoodoos; and a photograph of William Copeland McCalla. Fonds also includes three ledgers of farm notes, seed records, accounts of receipts and expenditures, manure records, etc. for William Copeland McCalla and Margaret McCalla's farms at St. Catherines, Ontario and Bremner, Alberta. Part of the third ledger is farm notes, accounts of receipts and expenditures, etc. for Frederick and Gladys McCalla, who took over the Bremner farm from parents William and Margaret. Includes some loose notes, correspondence, receipts, Alberta Wheat Pool grading slips, etc. Fonds also includes a CD made in 2008 by Alex McCalla that contains scans of all the pages in the ledgers. Fonds also includes McCalla's lantern slide projector and a wooden lantern slide case in a canvas carrying bag.