1. Bate-Smith, E. C., and Swain, T. [Chem. and Indust., 377 (1953)].
2. Robinson, G. M., and Robinson, R., Biochem. J., 27, 206 (1933).
3. Forsyth, W. G. C. (in preparation).
4. Forsyth, W. G. C., Biochem. J., 51, 511 (1952).
5. Roberts, E. A. H., and Wood, D. J., Biochem. J., 53, 332 (1953).