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The Soret coefficients of aqueous solution of alkaline earth chlorides were determined indirectly using combined thermocells. “Combined thermocell” refers to a cell system of a back to back combination of two thermocells made of common electrodes and different electrolytes without liquid junction. The values are −2.79 for MgCl2, −3.43 for CaCl2, −4.09 for SrCl2, and −4.73 for BaCl2, respectively (in the unit of 10−3 deg−1) at 0.005 m and 25°C. These agree with reported values found by the direct method.