23 NOVEMBER 1889, Page 24

Heat. By H. G. Madan. (Rivingtons.)—The aim of this treatise

is rather to show the general principles and laws of heat than to attempt a too mathematical demonstration of them. This, the true aim of an elementary manual, is often lost sight of in the straining after accuracy. We commend, therefore, a text- book which, well furnished with well-chosen experiments, is likely to interest the student in great natural laws. Mr. Madan's Heat is of this nature, and most suitable for elementary students.