1. Elmer, O. H., Science, 75, 193 ; 1932.
2. Huelin, F. E., Beport of the Food Investigation Board for 1932, p. 53. H.M. Stationery Office.
3. Smith, A. J. M., and Gane, R., ibid., p. 156.
4. Kidd, F., and West, C., ibid., p. 55.
5. Gane, R., ibid., 1933, p. 122.