 His other contributions to anaesthesia include the Boyle-Davis gag (still used today during tonsillectomy operations) and a popular textbook, "Practical Anaesthetics" (1907 and two subsequent editions).He was president of the Section of Anaesthetics of the Royal Society of Medicine in 1923, a founding member of the Association of Anaesthetists of Great Britain and Ireland and an early examiner for the Diploma in Anaesthesia.Since 2000 the department at St Bartholomew's Hospital has been named the Boyle Department of Anaesthesia.