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1 Department of Pharmacology and Experimental Therapeutics and Department of Medicine (Division of Clinical Pharmacology), The Johns Hopkins University School of Medicine, Baltimore, Maryland
In the paper, "Effects of Amphetamine, Chlorpromazine, Pentobarbital, and Ethanol on Operant Response Duration" by Bernard Weiss and Victor G. Laties (Volume 144, pages 17-23, April 1964), figures 2 and 3, on pages 19 and 20, were inadvertently reversed by the printer. The cut on page 20 is figure 2 and should have been on page 19 with the legend shown there; the cut on page 19 is figure 3 and should have been on page 20 with the legend shown there.