Measurements of ε′ and ε″ at 5 kHz are reported for the system aniline–cyclohexane in the region of the consolute temperature. No anomalously large values of ε′ and ε″were found in the region of concentration where the binodal curve is essentially flat. Traces of water increase the temperature for phase separation. An explanation in terms of the formation of molecular clusters is offered for the difference of behavior of this system and that of nitrobenzene – trimethyl pentane.