Using the method of Gray but with the values of ionic susceptibilities derived by Slater's method, bond depression values have been set up for various linkages. With these values, the molar susceptibility of a large number of compounds have been calculated and a close agreement between the calculated and observed values is obtained. An empirical correlation is found between bond-order and bond-depression and the results clearly indicate the double bonded character of certain carbon-carbon and carbon-halogen linkages. A method of evaluating ionic susceptibilities using ammonium and nitrate ions as standards is indicated.