1. Wassink, E. C., Katz, E., and Dorrestein, R., Enzymologia, 7, 113 (1939). Katz, E., and Wassink, E. C., Enzymologia, 7, 97 (1939).
2. Duysens, L. N. M., thesis, University of Utrecht (1952).
3. Bergeron, J. A., Brookhaven Symp. Biol., 11, 118 (1958).
4. Anderson, I. C., Bergeron, J. A., and Fuller, R. C., Arch. Biochem. Biophys. (in the press).
5. Cohen-Bazire, G., and Stanier, R. Y., Nature, 181, 250 (1958). Fuller, R. C., and Anderson, I. C., Nature, 181, 253 (1958).