Unpublished paper, 'On the application of the kinetic theory of gases to the electric, magnetic, and optical properties of diatomic gases' by George W [Walker] Walker Walker aims 'to examine the most important magnetic, electric, and optical properties of a gas, supposed to consist primarily of two atom molecules. A two atom molecule, in which the atoms are of unequal mass and carry equal and opposite electrical charges, was selected not as an actual representation of the molecule, but as typical of the characteristic features. I have adopted Boltzmann’s distribution law, and, as far as I can judge, have not applied it beyond the limits to which it appears to be justified experimentally. We have first to observe that the molecules may be divided into three classes, which I have called A, B, and C.' Includes two graphs. Subject: Chemistry Received 23 January 1901. Read 14 February 1901. Communicated by [Arthur William] Rücker. 1901