OPERATIVE SURGERY. Under the General Editorship of Charles Rob, M.C., M. Chir., F.R.C.S., Professor of Surgery, St Mary's Hospital, London; and Rodney Smith, M.S., F.R.C.S., Surgeon, St George's Hospital, London. Consultant and Associate Editors: J. Crawford Adams, M.D., F.R.C.S., Orthopaedic Surgeon, St Mary's Hospital, London; R. J. V. Battle, M.B.E., M. Chir., F.R.C.S., Plastic Surgeon to Queen Elizabeth Hospital for Children, and to St Thomas's Hospital, London; Sir Stewart Duke-Elder, K.C.V.O., Ph.D., D.Sc., LL.D., M.D., F.R.C.S., Director of Research, Institute of Ophthalmology, University of London; Ophthalmic Surgeon, Moorfields Eye Hospital, London; Maxwell Ellis, M.D., M.S., F.R.C.S., Surgeon to the Royal National Throat, Nose and Ear Hospital, London; Ear, Nose and Throat Surgeon to the Central Middlesex Hospital, London; C. M. Gwillim, M.D., F.R.C.P., F.R.C.S., F.R.C.O.G., Obstetric Surgeon, St George's Hospital, London; Surgeon, Samaritan Hospital for Women, London; Wylie