On page 39, Vol. viii, No. 2, September 18, 1925, multiply the right-hand side of formula (2) by the factor

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On page 44, immediately after formula (1) the text should be continued as follows:

Let us suppose a membrane to be separated by two solutions of KCl of different concentrations K1 and K2 and these concentrations and the corresponding concentrations of K+ within the membrane, which are in equilibrium with the outside solutions, to be so high that the H+ ions may be neglected. When a small electric current flows across the system, practically the K+ ions alone are transferred and that in a reversible manner. Therefore the total P.D. is practically

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This P.D. is composed of two P.D.'s at the boundaries and the diffusion potential within the membrane. Suppose the immobility of the anions is not absolute but only relative as compared with the mobility of the cations, KCl would gradually penetrate into the membrane to equal concentration with the outside solution on either side and no boundary potential would be established. In this case the diffusion P.D. within the membrane is the only P.D., amounting to

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but, V being practically = 0, it would result that

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So the definitive result is the same as in the former case.

Now cancel the printed text as far as page 48, line 13 from the top of the page, but retain Fig. 1.

On page 50, line 19 from the top of the page, cancel the sentence beginning with the word But and ending with the words of the chain.

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