electrochromatography alone or by chromatography alone in the same migration medium. With these substances, the ions follow the same pathway but at different rates (17-19, 31). This lack of separation is due to the counterbalanced effects of differential migration and chromatographic displacement. Other substances t h a t follow t h e same pathway may not be separable either b y one-way electrochromatography or by conventional chromatography. With these substances, t h e ions follow the same pathn a y at the same rate. The lack of separation is due t o equal electrical migration in the medium and to equal chromatographic behavior in the medium. The ratio of the electrochromatographic displacement to the chromatographic displacement is the tangent of the angle of displacement (9, 19, 31). When A and B follow the same pathway (when tan < A = tan
