1. Marais, J. S. C., Onderstepoort J. Vet. Sci. Animal Ind., 20, 67 (1944).
2. Swarts, F., Bull. Acad. Roy. Med. Belg., 31, 675 (1896).
3. Renner, W., Brit. Med. J., i, 1314 (1904).
4. Peters, R. A., Hall, R. J., Ward, P. F. V., and Sheppard, N., Biochem. J. (in the press).
5. Schlenk, H., Gellerman, J. L., Tillotson, J. A., and Mangold, H. K., J. Amer. Oil Chem. Soc., 34, 377 (1957).