Erratum.
May I point out a confusing error that occurs in the last line of Table 1 in our recent short paper (H. H. Plough and Madelon R. Grimm, "Reversal to Penicillin Sensitivity in a Cysteine-requiring Mutant of Salmonella," Science, February 18, 1949, pp. 173-4). This should read: "S. D. alone- - - - - - -," that is, seven minus signs instead of one minus and six plus signs. I had to correct in galley an error of the original manuscript under a similar heading five lines above, and I assume that somehow the last line got shifted too.
Plough
H H
HH