A NOTICEABLE feature of this treatise on theoretical mechanics is the large number of practical examples discussed. The majority of these are of a physical rather than an engineering character, some of them dealing with physical apparatus. Investigations of oscillations under various conditions occupy a considerable part of the book. The author claims mechanics as a branch of physics, the first chapter of physics, and aims at supplying a treatise of the kind which is likely to be useful to those whose interest in the subject depends on its applications to practical physical questions. He protests against the unpractical character of the French treatises on the subject written by mathematicians, and of the questions asked in examinations.