The phase-volume and component;l;concentration limits over which the oil-rich top phase, middle-phase microemulsion, or water-rich bottom phase was the continuous phase in their steady-state, three-phase macroemulsions were determined by means of electrical conductivity measurements for the amphiphile/oil/ "water" system C4H9OC2H4OH/n-decane/aqueous 10 mM NaCl. The measured limits are consistent with predictions based on the dispersion morphology diagram for the two-phase regions that surround the tie triangle.