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Elementary Class-Books — continued. It has been the endeavour of the author to arrange the most important facts and principles of Modern Chemistry in a plain but concise and scientific form; suited to the present requirements of elementary instruction. For the purpose of facilitating the attainment of exactitude in the knowledge of the subject, a series of exercises and questions upon the lessons have been ''added. The metric system of weights and measures, and the centigrade'' ''thermometric scale, are used throughout the work. The New Edition,'' besides new wood-cuts, contains many additions and improvements, and includes the most important of the latest discoveries, “As a standard general text-book it deserves to take a leading place.” —. “We unhesitatingly pronounce it the best of all our elementary treatises on Chemistry.” —.

In ordering, please specify Macmillan's Edition.

This work has been written mainly with the hope that a short and elementary book might help to make Political Economy a more popular ''study in boys' and girls' schools. In order to adapt the book especially for'' ''school use, questions have been added at the end of each chapter. In the'' New Edition each page has been carefully revised, and at the end of each chapter after the questions a few little puzzles have been added, which will ''add interest to the book and teach the learner to think for himself. “Clear,'' compact, and comprehensive.” —. “The relations of capital and labour have never been more simply or more clearly expounded.” — .

In preparing these Lessons the author has attempted to show that Logic, even in its traditional form, can be made a highly useful subject of study, ''and a powerful means of mental exercise. With this view he has avoided'' the use of superfluous technical terms, and has abstained from entering ''into questions of a purely speculative or metaphysical character. For the'' puerile illustrations too often found in works on Logic, examples drawn