Gas absorbing properties of methyl oleate and methyl elaidate were studied in comparison, in order to ascertain the experimental hypothesis that these properties might be associated with the cis-trans isomerism.

The result, however, led to the conclusion that no great difference exists between methyl oleate and its trans isomer, not only in the absorption rate but also in the absorbing capacity of the gases tested.

Free oleic acid was also investigated, with the restlt that it is smaller in the absorbing capacity and far smaller in the absorption rate, than methyl oleate or methyl elaidate.

In the present article, the author used a formula which was obtained for combining the first-order reaction formula and Henry-Raoult's law for diluted solution of a gas, with the result that the formula obtained is valid for the relation between the absorbed amount of the gases and the time, within the limits of experimental error.