1. Jervis, G. A., J. Biol. Chem., 169, 651 (1947).
2. Jervis, G. A., Research Pub. Assoc. Res. Nerv. Ment. Disease, 33, 259 (1954).
3. Bickel, H., Gerrard, J., and Hickmans, E. M., Acta Paediat., 43, 64 (1954).
4. Armstrong, M. D., and Tyler, F. H., J. Clin. Invest., 34, 565 (1955).
5. Woolf, L. I., Griffiths, R., and Moncrieff, A., Brit. Med. J., No. 4905, 57 (1955).