1. BEAZELL, J. M., IVY, A. C. (1936), Arch. Path., 22, 213.
2. BONNEY, G. L. W., PICKERING, G. W. (1946), Clin. Sci., 6, 63.
3. W. (1947), J. Amer. Med. Ass., 133, 459.
4. BIRCHER, E. (1920), Schweiz. med. Wchnschr., 25, 5I9.
5. CHAMBERLIN, T. A., WINSHIP, T. (1947), Surgery, 22 20.