The shamans of the Sharanahua Indians of eastern Peru have learned to enter the dream world of their patients through the medium of the hallucinogenic drug ayahuasca. Patient and shaman communicate within a symbolic system validated by myth and belief and structured by the curing songs handed down from shaman to shaman Paper delivered at the 2nd National Congress of Psychiatry, Neurology, and Neurosurgery in Lima, Perú, October, 1968, under the title : Preliminary report of an investigation of the use of Ayahuasca by a tribe of the Selva - to be published in: Hallucinogens and Shamanism (M. Harner, Editor). Oxford Univ. Press, New York.