1. Buchi, J., Ammann, J., Lieberherr, R., and Eichenberger, E., Helv. Chim. Acta, 36, 75 (1953).
2. Brownlee, M., Quart. J. Pharmacol., 10, 609 (1937); 12, 45 (1939). Cf. also Burn, J. H., Finney, D. J., and Goodwin, L. G., “Biological Standardization”, 311 (Oxford University Press, London, 1950).