In the December 1981 issue, the article " `On-Off' Syndrome Treated with Lithium Carbonate: A Case Report" by Donald R. Ross, M.D., C. Edward Coffey, M.D., Edwin L. Ferren, John Ingram Walker, M.D., and C. Warren Olanow, M.D., contains two typographical errors on page 1627. The second sentence in the second paragraph of the first column should read, ". . . Mr. A averaged .7 hours/day in off spells. . . ." The last sentence of the article should read, "Although several studies (9, 10) have investigated the use of lithium in treating established tardive dyskinesia, . . ."The staff regrets these errors.