The flux equations of part I have been tested for the diffusion of five salts at three temperatures through a Zeo-Karb disk. The experiments were carried out using a vitreous silica apparatus working on a constant-flow principle. The data support the main tenet of the theory that transport of ions in the resin takes place in an internal aqueous phase. A fair quantitative agreement is obtained. The theory would be improved by taking into account counterion binding by the resin and the electrophoretic effect in diffusion.