1. AMackay, H. IM. Ml., Med. Res. Counc., Spec. Rep. Series, London, 1931, 157. '2. Davidson, L. S. P., Fullerton, H. W., et al., Brit. Med. J., London, 1933, i, 685.
2. Davi(dson, L. S. P., Fullerton, H. W., & Campbell, IR. M., Brit. Med. J., London, 1933, ii, 195. Josephs, H., Bull. Johns Hopkins HIosp., Baltimore, 1931, XLIX, 246.
3. Parsons, L. G., Hickmans, E. 'M., & Hawksley, J. C., Arch. Dis. Childht., London, 1933, VIII, 85.
4. Lewis, M. S., J. Am". Med. Ass., Chicago, 1931, XCVI, 1135.
5. Titus, R. W., & Hughes, J. S., J. Biol. Chemn., Baltimore, 1929, LXXXIII, 463.