1. Clark, E. W., and Kitchen, G. F., J. Pharm. Pharmacol., 13, 121 (1961).
2. Pacific Mills, British Patent 700,215 (1953).
3. Horn, D. H. S., and Ilse, D., Chem. and Indust., 524 (1956).
4. Horn, D. H. S., and Ilse, D., J. Chem. Soc., 2280 (1957).
5. Truter, E. V., Wool Wax, 190 (Cleaver-Hume Press, Ltd., London, 1956).