Description:ALPH METZNER, PH.D. Ayahuasca: An Ethnopharmacologic History. DENNIS J. MCKENNA, PH.D. CHARLES S. GROB, M.D.. Phytochemistry and Neuropharmacology of Ayahuasca. J. C. CALLAWAY, PH.D The Experience of Ayahuasca: Teachings of the Amazonian Plant Spirits. Initiation into