We have investigated the effects of different concentrations of a range of surfactants on the kinetics of swelling of squalane-in-water emulsion drops by the addition of decane-in-water emulsion drops. Using a model described in detail in an earlier paper (Langmuir 1998, 14, 5402), we use the kinetic measurements to determine the product of the decane solubility C-infinity (expressed as a dimensionless volume fraction) and effective diffusion coefficient D for the transport of decane between drops across the aqueous continuous phase. We address the issue as to whether the decane transfer occurs by "molecular" transport or whether the surfactant micelles present in the continuous aqueous phase act as "carriers" for the decane. We have investigated swelling rates for different concentrations of two nonionic surfactants, dodecyl hexaoxyethylene glycol ether (C12E6) and dodecyl octaoxyethylene glycol ether (C12E8), the cationic surfactant tetradecyl trimethylammonium bromide (TTAB) and the anionic species sodium dodecyl sulfate (SDS). The solubilization of decane was determined for aqueous solutions of all the surfactants. For molecular transport, the product CinfinityD is predicted to be of the order of 10(-17) m(2) s(-1) and independent of the surfactant concentration in the continuous aqueous phase. From the swelling experiments, the product CinfinityD is found to be on the order of 10(-14)-10(-13) m(2) s(-1) and to increase with surfactant concentration for all species except SDS. The measured magnitudes of CinfinityD for all the surfactants are consistent with oil transfer occurring by the "micelle carrier" mechanism with negligible energy barrier to the transport process.