The ratio of the concentration of pyruvic acid to that of its hydrate (2,2-dihydroxypropanoic acid) has been determined from the ratio of the intensities of their methyl resonances at 60 Mclsec. The kinetics of the hydration of pyruvic acid have been studied ; the hydrogen-ion-dependent rate constant of the hydration is 5.6 1. mole-I sec-1, and that of the dehydration 8.7 1. mole-1 sec-1. The results generally confirm the conclusions dawn from a limited study of these phenomena at 28 Mclsec.

Densities of methanol-water and 1 : 4 dioxan-ethanol at 25" are reported, and in the latter system there axe considerable differences from previously published data. Attempts to interpret molecular interaction from partial mold volume-mol. fraction curves are described.

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