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the present results t o physical phenomena, however, depends on the validity of the Poisson-Boltzmann equation, and the validity of this equation under conditions where Z e / k T < < l is not satisfied is also open to question (for a review on this point, see H. S. Harned and B. B . Owen, “The Physical Chemistry of Electrolytic Solutions,” 3rd Ed., Reinhold Publishing Corp., iYew Tork, S . Y . , 1958, pp. 57-58). The general reader will find Overbeek’s articles in “Colloid Science,” H . I, .I seconti volui~icdcaling 1viLIi purific;ttiiiti ; t l i l l :tl al)plicati~~:is of the i n u t g a s h i i 1)rimisml. ‘MEX’I’ (IF 1’HTSICS AN13 . \ S I R I ~ h ~ I I M \ SITT O F I
