1. Wurmser, R., Arch. Phys. Biol., 1, Nr. 3 (1921). See, however Knorr, H. V., and Albers, V. M., Cold Spring Harbor Symposia of Quantitative Biology, 3, 87, 38 (1936).
2. Rabinowitch, E., and Lehmann, H. L., Trans. Faraday Soc., 31, 689 (1935). Kabinowitch, E., and Wood, W. C., J. Chem. Phys., 4, 497 (1936).
3. Padoa, M., and Vita, N., Biochem. Z., 244, 296 (1932).
4. Franck, J., and Wood, R. W., J. Chem. Phys., 4, 553 (1936).
5. Rabinowitch, E., and Weiss, J., NATURE, 138, 1098 (1936). Proc. Roy. Soc., 1937 (in the press).