The transport numbers of the chloride ion in the pure molten alkaline earth chlorides have been determined. A modified Stokes' law was applied to the motion of the individual ions. Application of the assumptions made in invoking this law gave a qualitative estimate as to the degree of association in MgCl ₂, CaCl₂, SrCl₂, BaCl₂, ZnCl_2, and PbCl₂ • Several trends were observed which were consistent with the chemical properties of the salts studied.