1. DAVSON, T., BALL, J., and PLATT R. (1948), Quart. J. Med., 17, 175-
2. ELEKELES, A., and GLYNN, L. E. (1944), Brit. J. Radiol., 17, 368.
3. GRANT, R. T. (1939), Clin. Sci., 4, 245.
4. HARRIS, A. W., LYNCH, G. W., and O'HARE, J. P. (1939), Arch. intern. Med., 63, I63.
5. MILLER, H. G., and DALEY, R. (1946), Quart. J. Med., 15, 255.