Date (happened)
c. 1910
(possible)
passage 534528 (lecture nid 1240): 'because I am mystically inclined since I was a child, he said he would like to experiment and take it with me.'
Told / reported
22 February 1966
(probable)
lecture nid 1240 'The Eternal Plan' delivery date 1966-02-22, per catalog #318 (legacy_unreviewed, no independent corroboration found in this packet, but also no conflicting claim).
In discussing his own experience with LSD, Neville mentions that a physician friend, aware that Neville had been mystically inclined since childhood, wanted to test the drug's effects on him under observation, with Aldous Huxley originally set to watch (though Huxley fell ill and could not attend). Neville and two observers proceeded with the maximum dose, and he reports the experience as nothing like its reputation -- pure distortion rather than genuine mystical insight.