FIG, 7. Diffusion potentials between solutions of •/128cane sugar, M//255 NaCI, CaCI~, CeCI3, and Na~SO~ in various concentrations of HNOa and solutions free from these salts but of the same concentrations of HNO3. The salt solutions and the solutions free from salt had always the same pH. Abscissae are the pH; ordinates, diffusion potentials. Attention is called to the resemblance between the curves in Fig. 7 and those in Fig. 5.