title: Erratum.
abstract: The third sentence of the legend for Fig. 2 of the report, "Blocking by picrotoxin of peripheral inhibition in crayfish," by W. G. Van der Kloot, J. Robbins, and I. M. Cooke [Science 127, 521 (7 Mar. 1958)] should have read "The inhibitory nerve was simultaneously stimulated at a rate of 21 stimulations per second (broken line) or at 150 stimulations per second (dotted line)."