Son of Abraham Horsfall, of Leeds. He matriculated at University College, Oxford, in October, 1859, and took a pass degree. He was afterwards a student and House Surgeon at St Bartholomew's Hospital, in connection with which he published "Tetanus - a Case at St Bartholomew's" in the *Lancet* (1867, ii, 767). He then practised at Hilary House, Leeds, was Surgeon to the Leeds Dispensary from 1871-1882, Lecturer on Physiology at the Leeds School of Medicine from 1874-1882, and was also Hon Secretary and Registrar to the Medical School. In 1887 he was Surgeon to the Leeds Hospital for Women and Children, to the Leeds Fever Hospital, to the Convalescent Homes at Manwood and Coodridge, and at one time he was Assistant Surgeon to the 7th (West Riding) Yorkshire Rifle Volunteers, and in partnership with Sydney Rumboll, FRCS. Later he went to reside at Bournemouth, and practised at Naples during the winter season. He died at Naples on May 31st, 1904.