I am grateful to Major-General J. Huston, Q.H.S., F.R.C.S., Director of Surgery, for his advice and encouragement and to Captain G. Tate, R.A.M.C., and Mr. A. E. Pridham, for their help. REFERENCES FINNEY, J. M. J., & HANRAHAN, E. M. (1930). Ann. Surg., 92, 620. GOLlGHER, J. C., MOIR, P. J. & WRIGLEY, J. H. (1956). Lancet, 1, 220. McDoNALD, O. G., GILLESPIE, M. G. & LA BREE, R. H. (1953). A.M.A...