1. ALLISON, R. S. (1952), Brit. med. J., ii, I286 APTER, N. S., et al. (1951), Amer. J. Psychiat., 107, 808.
2. BATCHELOR, I. R. C., and NAPIER, M. B. (1953), Brit. med. J., ii, II86. BUSSE, E. W., et al. (1954), Amer. J. Psychiat., I0o, 897. CAMARGO, 0., and PRESTON, G. H. (1945), Ibid., 102, i68.
3. CLARKE, E., and COOPER, R. (1954), Lancet, i, I260.
4. CURRAN, D. (1955), personal communication. EHRENBERG, R., and GULLINGSRUD, M. J. 0. (1955), Amer. J. Psychiat., III, 743.
5. EVANS, V. L. (1943), Ibid., 99, 53I.