An apparatus for determining the solubility of gases in liquids with enhanced speed and precision has yielded figures for the solubility in (CH3)2SO at 1 atm and 25° of He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, CO2, and CH4 and for both solubility and entropy of solution in c-C6H12 of Ne, Ar, Kr, Xe, H2, N2, CO2, C2H6, and c-C3H6. The latter results fall closely on a straight line when the partial molal entropy of solution, S2̄ - s2g (1 atm, 25°) is plotted against -R In x2 (x2 ≡ mole fraction of the gas). The theoretical significance of these results will be discussed in a later paper by J. H. Hildebrand.