Heats of Formation of Sodium and Lithium Borohydride 2775 ments from 80 to 298.16°K., which appear in the next three lines, were obtained by the usual methods directly from the experimental data. The results for the total entropy in calories per degree per mole are then given in the last line with the designation "SW; they are probably reliable to within 0.7 e. u. in an absolute sense and to 0.3 e. u. for comparative purposes.

The viscosities of aqueous solutions of five amino acids have been measured at 25 and 35" at a series of concentrations. The relative viscosities of these solutions have been expressed as a function of concentration; the function is non-linear in all cases. The activation energy for viscous flow, E*, and the quantity AE* -EX,othe differential activation energy, has been calculated for solutions of these amino acids. A general correlation between AE* (calculated from viscosities at 25 and 35") and SI -SI (calculated from heats of dilution at 25") has been demonstrated.

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