AImtract-Meamrements have been made on cells which contain liquid junctions between two solutions containing different solvents. By employing cells in which the two solutions are saturated with the same salt, it has been possible to directly measure the contribution to the liquid junction potential of the transfer of solvent species across the solutionsolution interface. This solvent-solvent junction potential has been measured for junctions between water and methanol, ethanol, acetone, acetonitrile, and propylene carbonate solutions and for some junctions between pairs of these nonaqueous solutions. The values obtained for the solvent contributions to the liquid junction potentials were somewhat smaller than the corresponding values obtained indirectly by other workers using cells with junctions between salt solutions in different solvents. The potentials were found to depend greatly on the particular salt employed, but to be independent of the method of forming the liquid junction. A possible explanation of the mechanism giving rise to these potentials is given, The possible formation of solid solvatea of lithium, potassium, thallium, and mercurous chlorides in these solvents was also investigated.