1. Argus, M. F., and Hoch-Ligeti, C. (1961). J. nat. Cancer Inst., 27, 695.
2. Axelrod, J., Reichenthal, J., and Brodie, B. B. (1954). J. Pharm. exp. Ther., 112, 49.
3. Bailie, M. J., and Christie, G. S. (1959). Biochem. J., 72, 473.
4. Barnes, J. M., and Magee, P. N. (1954). Brit. J. industr. Med., 11, 167.
5. Brookes, P., and Lawley, P. D. (1961a). J. chem. Soc., p. 3923. -, - (1961b). Biochem. J., 80, 496.