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In Vol. 37, No. 6, July 20, 1954, page 814, in the third paragraph, delete the first sentence and insert the following: This equation gives excellent results with Nitella for example with 0.001 M KCl outside and 0.05 M KCl in the sap we may use concentrations in place of activities in the equation and put as = 0.05 and ao = 0.001. No allowance is made for any change in the concentration of incoming ions due to their combination with carrier molecules since this change would be small and difficult to estimate. If we put U = 73 and V = 1 we obtain P = 97 mv. which is close to the usual observed value. The expression (73 –1) ÷ (73 + 1) = 0.973.

APPARENT VIOLATIONS OF THE ALL-OR-NONE LAW IN RELATION TO POTASSIUM IN THE PROTOPLASM