In 1943 a Swiss chemist accidentally ingested the experimental compound LSD. The psychedelic revolution that followed is now mostly associated with pop culture, but the use of mind-altering drugs - and the belief in their transformative powers - was pioneered by scientists, psychiatrists, philosophers and writers. First published in 1965, this collection of essays by figures as diverse as Timothy Leary, Julian Huxley and Ralph Metzner recaptures that moment.
