First edition of the Czech psychiatrist's third book on LSD, an attempt to "explain the various phenomena encountered in psychedelic experience." Pomona, CA: Hunter House, 1980. 352pp., with index and color plates. 8vo. Blue vinyl stamped in silver on front board and spine; dust jacket. Light bumping to corners. Else near fine in a very good, unclipped (but unpriced) jacket showing mild corner wear, with spine panel sunned from green to blue.