in 2-1 electrolytes. The model fitting to the experimental data allows us to extract two independent parameters,« and /exptl. The growth behavior of micelles in 2-1 electrolytes is quite different from that in 1-1 electrolytes. The divalent counterions Mg2+ and Ca2+ are more effective in the shielding of electrostatic interactions between micelles than the monovalent counterion Li+. The effective micellar surface charges are strongly affected by the added 2-1 electrolytes when the detergent concentration is low. The measured /exptl is in reasonable agreement with the EMN theory.The mechanism which is responsible for switching the intermicellar interaction from a repulsive to an attractive one is probably due to the gradual dominance of the van der Waals interaction as the double layer repulsion diminishes, and a further investigation on the nature of this attraction should be of great interest.13Acknowledgment. We are grateful to the Biology Department of BNL for use of their small angle spectrometer in this work. Acknowledgement is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for support of this work.

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