Lived at Ballough in the isle of Man. Stevens sold his collection of British insects including Coleoptera on 23 April 1912 (Chalmers-Hunt (1976)). Hancock & Pettit (1981) list a collection of Lepidoptera and other insects formed by Mr Cassall mainly in the period 1930-50, belonging to the Isle of Man Natural History and Antiquarian Society. Son? (MD 1/O2)