Book Review: Drugs for Young People: Their Use and Misuse. By Kenneth Leech and Brenda Jordan. Religious Education Press, 1967. vii+132 pp. IDS. 6d.; The Private Sea: LSD and the search for God. By William Braden. Pall Mall Press, 1967. 255 pp. 30s; Battle for the Free Mind. By Ian Ramage. George Allen and Unwin, 1967. 269 pp. 40s