Sir: The writer is grateful to Dr. Alan D. Pethybridge (University of Reading, U.K.) for calling attention to errors in the text of the above paper.1 In the original manuscript, the symbol c, = cy was used for ionic concentration; the subscript i was inadvertently omitted in the text. In accordance with the definition of by (1.8), the factor y1/2 should be inserted after c1/2 in the following places:
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