Abstract: A method for controlled proportioning of liguids with a postive-displacement device (2) for dislocating a gas cushion (17) includes measuring the pressure (pab) in the gas cushion (17) at the time of a complete discharge of a liquid volume, measuring the discharge time (tab) for a complete discharge of the liquid volume and determining the time demand (&Dgr;t) to compress the gas cushion (17) by the postive-displacement device by means of the pressure (pab), the dead volume (Vo) of the gas cushion (17), a gas condition equation, and the volumetric gas flow (Q) discharged by the postive-displacement device. A corrected discharge time (toab) is determined as a proportioning control magnitude by a deduction of the time demand (&Dgr;t) from the measured dischage time (tab) with outputting, and/or saving, and/or resorting to the deviation of the corrected discharge time (toab) from a desired discharge time (tsoll) for regulating the discharge of the liquid volume.