NY: G. P. Putnam's Sons, 1964. First edition. 8vo, brown boards blind-stamped to front and backed with maroon cloth; gilt spine titles; dust jacket. Moderate foxing to to textblock top and endpapers. Unclipped ("$5.95") jacket with foxing to flaps and interior, light fading to spine. Very good in a like jacket. An important collection of essays on LSD, as introduced by Timothy Leary. Notable for containing writings by Aldous Huxley, Alan Watts, William S. Burroughs, and Alan Harrington, as well as numerous contributions from clinicians and psychologists.