Solubilities of carbon dioxide and ethylene in water and a number of aqueous salt solutions are measured at about I atm. and 25°C by the gas volumetric method. A experimental results are correlated by the modified empirical Setschenow equation. The salting-out parameters which consist of three components ascribed to gas, cation and anion in aqueous salt solution, are estimated from the results of this experiment as well as from those listed in International Critical Tables and Landolt-Bornstein Tables. With these calculated salting-out parameters, the solubilities of gas in aqueous salt solutions are predicted accurately within the standard deviation 0.052. Nine more species of gas, sixe more species of cation and five more species of anion than the data by van Krevelen and Hoftijzer include are taken into account.