There are two errors in the reference list accompanying "Possible Withdrawal from Endogenous Opiates in Schizophrenics" by Michael Gitlin, M.D., and Michael Rosenblatt, M.D. (March 1978 issue, p. 378). The correct title in reference 3 is "Naloxone-induced reversal of schizophrenic hallucinations." The correct title in reference 4 is "Lack of effect of naloxone on schizophrenic symptoms." The staff regrets these errors.