1. Franck, J. and Haber, F., Ber. Akad. Wiss. Berlin, 13; 1931.
2. Haber, F. and Willstätter, R., Ber. deut. chem. Ges., 64, 2844; 1931.
3. Haber, F. and Weiss, J., Proc. Roy. Soc., A (in the press). See also Haber and Weiss, Naturwiss., 20, 948; 1932.
4. cf. Conant, J. B., Chem. Rev., 3, 1; 1927. Michaelis, L. and Smythe, C. V., J. Biol. Chem., 94, 329; 1932.
5. cf. Warburg, O., Biochem. Z., 266, 1, 377; 1933. Kuhn, R. and Wagner-Jauregg, T., Ber. deut. chem. Ges., 67, 361; 1934.