1. Aghajanian, G. K., Foote, W. E., and Sheard, M. H., Science, 161, 706 (1968).
2. Aghajanian, G. K., Sheard, M. H., and Foote, W. E., Psychotomimetics (edit. by Efron, D. H.), (US Government Printing Office, Washington, DC, in the press).
3. Dahlstrom, A., and Fuxe, K., Acta Physiol. Scand., 62, 232 (1965).
4. Andén, N. E., Dahlstrom, A., Fuxe, K., Larson, K., Olson, L., and Ungerstedt, U., Acta Physiol. Scand., 67, 313 (1966).
5. Freedman, D. X., J. Pharmacol. Exp. Therap., 134, 169 (1961).