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The discussion as to the relation of the adiabatic and isothermal moduli of elasticity is part of a very important paper on "Thermoelastic, Thermomagnetic, and Thermoelectric Properties of Matter," which he published in the Philosophical Magazine for January 1878.

This was in the main a reprint of an article entitled, "On the Thermoelastic and Thermomagnetic147 Properties of Matter, Part I," which appeared in April 1855 in the first number of the Quarterly Journal of Mathematics.

There are treatises written from a more general standpoint, which deal with complex problems of chemical and physical change of means of thermodynamic potentials, and processes which are not to be found set forth in this volume of papers; but even these are to a great extent an outcome of his "Thermoelastic, Thermomagnetic and Thermoelectric Properties of Matter."