1. Campbell, M. (1932). Lancet, 2, 1157.
2. Cohn, A. E., and Fraser, F. R. (1913). J. Pharm. exper. Ther., 5, 512.
3. The Action and Uses in Medicine of Digitalis and its Allies, London;Cushny, A.R.,1925
4. Mackenzie, J. (1905, a). Brit. Med. J., 1, 520.
5. (1905, b). Ibid., 1, 587.