Born at Brixton, London on 25 July 1872, the second son and youngest child of Sextus Dyball, architect and surveyor, and Elizabeth Ledger his wife. He entered Merchant Taylor's School, then in Charterhouse Square, in January 1883, won the hurdles, played in the school XV 1889-90, rose to the Prompter's Bench, and left in 1890 with the medical exhibition to St Thomas's Hospital given by the Merchant Taylors' Company. He did brilliantly at the hospital, winning the Cheselden medal and being awarded the Beaney scholarship in surgery. He graduated at London University, with honours in medicine and obstetric medicine at the MB examination, and with the scholarship and gold medal in surgery at the BS examination. At St Thomas's Hospital he was house surgeon and assistant demonstrator of practical surgery in the medical school. He then acted as resident medical superintendent at the Hospital for Sick Children in Great Ormond Street, and passed from there to become resident surgical officer and casualty officer at the Leeds General Infirmary. He settled in practice at Exeter in 1903, and acted as anaesthetist to the Royal Devon and Exeter Hospital and to the Devon and Exeter Dental Hospital. He was elected assistant surgeon at the Royal Devon and Exeter Hospital in 1912, becoming surgeon in 1916 in succession to A C Roper. He was also consulting surgeon to the Sidmouth, Exmouth, and Winsford Cottage Hospitals. He accepted a commission as captain à la suite when the Territorial Medical Service was established, his commission being dated 29 September 1908, and he was attached to the 4th Southern Hospital. When mobilization took place in August 1914 he was called up and seconded to take charge of the 5th section of the Exeter War Hospital, with more than 200 beds. He also established the orthopaedic organization throughout Devon, which became centred at the Princess Elizabeth Orthopaedic Hospital. The whole credit for the work was equally divided between him and Dame Georgiana Buller, who superintended the lay side. He married Evelyn Maud Knight, daughter of Sir Henry Knight, Alderman of Cripplegate Ward and Lord Mayor of London 1883-84. She survived him with two daughters and a son. He died at Haytor on 29 June 1934 and was buried at Ilsington, Devon, a man generally beloved, who combined powers of independent and original practical thought with great manual dexterity. It is said of him that he never took the chair at a public meeting nor did he ever preside if he could possibly escape doing so. He was honorary secretary of the section of surgery at the Exeter meeting of the British Medical Association in 1907. Publications:- Case of tubal gestation, primary intraperitoneal rupture, operation, recovery. *Brit med J*. 1904, 1, 718. Fatal case of secondary parotitis. *Ibid*. 1904, 1, 1012. Parotitis following injury or disease of the abdominal and pelvic viscera. *Ann Surg*, 1904, 40, 886.