Heat and mass transfer data are reported for the condensation of vapours of immiscible liquids. Condensation occurred on the outside of 0.0254 m diameter horizontal copper tube. Mixtures of organic vapours in steam have been studied, such mixtures being rich in steam and removed from the eutectic composition. The condensate flow pattern has been determined experimentally. In systems where the density ratio of the organic to water liquids is less than one, a standing-drop pattern is observed; when the ratio is greater than one, channeling flow is the main feature. For systems removed from the eutectic composition, diffusional resistance through the vapour phase adjacent to the vapour-liquid interface has a major effect on the transfer rates.