1. Oxford, A. E., Raistrick, H., and Simonart, P., Biochem. J., 33, 240 (1939).
2. Gentles, J. C., Nature, 182, 476 (1958).
3. Riehl, G., Meeting of the Austrian Dermatological Society, Vienna, (November 1958).
4. Blank, H., and Roth, F. J., Meeting of the American Academy of Dermatology, Chicago (December 1958).
5. Williams, D. I., Marten, R. H., and Sarkany, I., Lancet, ii, 1212 (1958).