His father insisted on his entering a merchant's office in Glasgow, in preparation for an Indian commercial career.
He had studios successively at Hampstead (Haverstock Hill), in Piccadilly, and at Beer, Devon.
He painted in the western Scottish Highlands from a small yacht, the south coast of Devon, Heligoland, the Netherlands, and southern Italy.
His contributions to the major London exhibitions extended over twenty years, from 1876, when Hoisting the Storm Jib was at the Royal Academy, until 1896, when his last picture, the Crofter's Team, (which went to the Millbank Gallery) hung on the same walls.
[1] Macallum left a widow, Euphemia, daughter of John Stewart of Glasgow, and one son.