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The partial molal volumes of monovalent ions in methanol have been obtained from ultrasonic vibration potential and density data for solutions of uni-univalent electrolytes. The ionic partial molal volumes are found to be smaller in methanol than in water. The use of Hepler's equation has permitted us to estimate the geometric and electrostrictive contributions to the partial molal volumes of ions in methanol. The electrostriction appears to be larger for tetraalkylammonium ions than for alkali metal and halide ions. Also, the electrostriction of ions has been found to be larger in methanol than in water. These results are explained in terms of differences in the content of the solvation layer of ions in methanol. The void space around ions appears to be smaller in methanol than in water.

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