The salt is freed in large part from compression due to chemical affinity and to molecular cohesion. (b) When the ions and probably the molecules are combined with the water both the hydrated substance and the water undergo compression. This latter effect varies regularly with the compressibilities of the substances involved as well as with their affinit'es for each other. (4) It is shown that the change in volume in the formation of the ions from the elements, as measured by the sum of the change in volume in the formation of the solid salt and the change in volume during solution, is an additive property. (5) The part which the polymerization of water plays in the change is uncertain. Probably this effect varies in importance with varying temperature. It is also probable that a t the temperature of the experiments cited, the effect is small, since the observed effects are not in accord with those to be expected if the contraction is due wholly to changing polymerization. It is obvious that the data furnished a t the beginning of this paper allow the calculation of the densities of aqueous solutions of many of the salts considered up to moderately high concentrations. The study of change in volume during solution will be continued in this laboratory by the examination of other salts and other solvents, and by the determination of the effect of varying temperature on the magnitude of the observed effect. CAMBRIDGE, MASS. THE DISTRIBUTION OF AMMONIA BETWEEN WATER AND CHLOROFORM.

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