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By J. Wilks London: Oxford University Press. Pp. viii + 142. Price 15s. The third law of thermodynamics was originally put forward in the form of the Nernst Heat Theorem in order to predict the equilibrium conditions of chemical reactions. Since that time the scope and significance of the theorem have been steadily increased, largely by the late Sir Francis Simon, until it is now a fundamental principle of both physics and chemistry.

Edited by R. W. Haywood London : Cambridge University Press. Pp. 23. Price 2s. 6d. This is the second edition of the volume first published in 1956. It contains some general data which are of use in thermodynamic calculations and short tables of gas data (mol. wt, density, specific heats, etc.) and calorific values.

By P. T. Landsberg New York and London: Interscience Publishers, Inc. Pp. x + 499. Price 109s. New books on thermodynamics have been appearing with great frequency over the last few years, but unfortunately few of these publications represent a real contribution to our understanding of the subject. This book, however, is one of the few.