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5while if thc increase occurs in the nutrient membrane doubt is cast on the assumption that C1-and HC03-moves across the nutriemt membrane as free ions because improbably high emf's would be demanded (5). Further work needs to be done More an analysis of the implications of this finding for the mechanisms of ion transport would be profitable.Conclusion. The addition of Ba++ to the fluid bathing the nutrient side of the frog gastric m u c m resulted in a marked increase in resistance and relatively little change in the H+ rate and the PD. Addition af Ba++ in comparable and higher concentrations to Ithe secretory fluid had no effect.

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