In Sacred Vine of Spirits: Ayahuasca Ralph Metzner, a pioneer in the study of consciousness, has assembled a group of authoritative contributors who provide an exploration of the chemical, biological, psychological, and experiential dimensions of ayahuasca. He begins with the history, psychology, and chemistry of ayahuasca from leading scholars in the field of psychoactive research and then presents more than twenty firsthand accounts from Westerners who have used ayahuasca. He concludes with his own findings on ayahuasca's applications in medicine and psychology, and compares the worldview revealed by ayahuasca visions to that of Western cultures.