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The extension of the laws governing dilute solutions to a variety of components in concentrated solutions has attracted considerable attention in recent investigations. A critical scrutiny of the derived equations, which are thermodynamically sound and which in a measure have corrrelated changes in colligative properties with changes in concentration, reveals that these were deduced for ideal mixtures containing one component greatly in excess of the other.The applications of the generalizations of van't Hoff, Raoult, and Henry to property-composition relations have been the subjects of many research problems. These are problems of great importance, from both theoretical and practical standpoints, and much of physical chemistry is concerned with them.The problem of solubility may be considered from two angles. In the first place, one may consider how the escaping tendency of any component of a solution varies with the composition of the solution, and in the second place, one may consider how this escaping tendency depends upon the specific character of the components.As a part of a comparative study of binary and ternary systems made up of water, a hydrocarbon, and a lower alcohol, the following observations have been made on solutions of isopropyl alcohol in benzene and isopropyl alcohol in water. MATERIALSThe methods of purification and the physical constants of these materials have been discussed and recorded in a previous article (10).

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