1. For an excellent discussion, see Sutherland, G. B. B. M., in “Advances in Protein Chemistry”, 7, 291 (1952).
2. Lenormant, H., Ann. Chim., (12), 5, 459 (1950).
3. cf. Blout, E. R., and Lenormant, H., J. Opt. Soc. Amer. (in the press).
4. Edsall, J. T., Otvos, J. W., and Rich, A., J. Amer. Chem. Soc., 72, 474 (1950).
5. Blout, E. R., and Linsley, S. G., J. Amer. Chem. Soc., 74, 1946 (1952).