A method of analysing the differential capacity developed by Amokrane and Badiali is applied to investigations of the structure of the interface between mercury and simple aliphatic alcohols. Capacitance data for methanol, ethanol, n-propanol and n-butanol are discussed. The solvent contribution C(S) is obtained by subtracting the contribution C(M) due to the metal from the inner layer capacitance C(i) according to the procedure proposed by Amokrane and Badiali. The C(S) values are found to be very similar for all aliphatic alcohols studied. The C(S)-sigma(M) curves have a similar shape with a single maximum at a posititive charge density and a characteristic inflection at a negative charge density. The effect of ions in the various supporting electrolytes on the C(S)-sigma(M) profiles was also studied.