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with definit acidic and basic properties, it is not a t all strange that the heat of neutralization should vary considerably from solvent to solvent. Summary. I. Measurements of heats of reaction in non-aqueous solutions have been made and reported for the first time. 2. The amount of heat liberated for a given reaction in different solvents has been found to vary greatly from solvent to solvent. 3. These considerable differences cannot be explained as being due to any electrolytic dissociation of the acetate, nor are they due to differences in the heats of solution of the acetate in the different solvents. 4. The chemical nature of the solvents does not seein to give any clue as to the magnitude of the heat of neutralization in the cases investigated, nor of the magnitude or sign of the heat of solution of the resulting acetate. It is proposed to continue this line of work, using such other reactions as may be found available.

Direct analysis of the separated phases in unmixed sodium borosilicate glasses has been carried out using an electron microprobe analyzer. The results are discussed in relation to the tie-lines proposed by Charles,' Tran,Z and Ma~urin.~