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1. The 25°C. isotherm for the system lithium chloride-dioxane-water has been presented. The system shows immiscibility for mixtures of high dioxane content.2. A new solvate, LiCl • H20 • (CMD/L, has been prepared and identified.3. A method of preparing anhydrous lithium chloride from the double solvate has been described.

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Assuming that the ions in solution near a charged wall are subjected only to electrostatic and kinetic forces, it is shown that the potential gradient normal to the wall is determined principally by the valence and concentration of the ion of opposite charge to the wall. Assuming that the valence and concentration of this ion determine the effect of the salt on the electrokinetic potential of the wall, the surface potential of the wall and the thickness of the immobilized liquid layer are calculated from electrokinetic potential data. Salts of ``normal'' ions (NaCl, BaCl2, etc.) cause relatively small changes in the surface potential and thickness of the immobilized layer at a glass surface and these changes occur only at very low salt concentrations. Salts containing ``abnormal'' ions (H+, OH—, La+++, etc.) produce larger changes and the change continues over a much wider concentration range. The extreme effectiveness of salts like AlCl3 and ThCl4 in lowering negative electrokinetic potentials cannot be accounted for by the higher valence of the ions.

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Numerous measurements of the rate of penetration of dissolved substances into diffusion media have been made. The work of Stiles (2), who used an indicator for determining the rate of penetration of electrolytes into gels, illustrates a simple and direct type of experimental method for such measurements. However, the results of many such measurements have been expressed by means of empirical equations which do not permit the calculation of diffusion coefficients. The various equations which have been derived for the calculation of diffusion coefficients appear either to be inapplicable to this particular type of experimental method, or to involve a complicated and sometimes questionable method of calculation.