The surface tension of cadmium caprate and laurate in benzene-methanol mixtures of varying composition has been measured at 40 ± 0.1°C. The critical micelle concentration (CMC) values depend upon the composition of the solvent mixture and are found to decrease with increasing chain length of cadmium soaps. Previous findings about the CMC of the soaps are in general confirmed. The data have been discussed on the basis of Szyskowski's empirical equation,The parameters X, Y, and (-X In Y) are found to decrease up to ∼50% methanol concentration. Above that, the trend vanishes. This confirms that the nature of the micelles formed below and above 50% methanol concentration is quite different. The area covered by 1 g-mole of the soap also shows that the change in the nature of micellization takes place at ∼50% methanol concentration.