1. Beckett, A.H., Belthle, F.W., Fell, K.R. & Lockett, M.F. (1954).J. Pharm. Pharmacol. 6:785.
2. Halton. (1948).Brit. J. Pharmacol. 3:328.
3. Hammouda, F.M., Rizk. A.M. & Abel-Gawad, F.M. (1972a).Current Sci. (in press).
4. Hammouda, F.M., Rizk, A.M., Ghaleb, H. & Abel-Gaward, F.M. (1972b).Planta Medica (in press).
5. Magnus, A. Pflugers. (1904).Arch. J.D. Ges. Physiol. 102,123.