For very low salt concentrations the only distinct contribution results from σ d +-. Since t c < 0.5 this implies t + < t c , explaining observation (i). Furthermore, when reaching a salt concentration of 1 M, there is a significant contribution of σ d ++ . Since σ d ++ is negative it gives rise to a decrease of the transference number. The simultaneous decrease of σ d +-, yielding a positive contribution to t c is suppressed due to the lower value of the factor (1 -2 • t c ) (as compared to the factor (1 -t c ) in front of σ d ++ ). Thus, the present analysis clearly allows one to attribute the decreasing transference number, i.e. observation (ii), to an increasing anti-correlation of the cations. At 2M the calculated transference number has much higher value than the experiment. We argue that this arises due to the complex nature of Eq.( ) which translates even lower deviation of conductivity (10%) to much larger deviation in the transference number.