A New and Valuable Work for the Practical Mechanic and Engineer. APPLETONS' CYCLOPÆDIA OF APPLIED MECHANICS of 1879 is a new work, and not a revision of the former Dictionary of Mechanics of 1850. It aims to present the best and latest American practice in the mechanical arts, and to compare the same with that of other nations. It also exhibits the extent to which American invention and discovery have contributed to the world's progress during the last quarter century. Its production is deemed timely in view of the existing popular interest in the labors of the mechanic and inventor which has been awakened by the great International Expositions of the last decade, and by the wonderful discoveries made by American inventors during the past three years. The CONTRIBUTORS whose names are given above number many of the most eminent American mechanical experts and engineers. Several of their contributions contain the results of original research and thought, never before published. Their efforts have in all cases tended to simplify the subjects treated, to avoid technicalities, and so to render all that is presented easily understood by the general reader as well as by the mechanical student. Examples are appended to all rules, explanations to all tables, and in such matters as the uses of tools and management of machines the instructions are unusually minute and accurate. In semi-monthly Parts, 50 cents each. Subscriptions received only for the entire work of Twenty-four Parts. D. APPLETON & CO., PUBLISHERS, 549 & 551 BROADWAY, New York. PRIMERS IN SCIENCE, HISTORY AND LITERATURE. 18mo. Flexible cloth, 45 cents each. I.-Edited by Professors HUXLEY, ROSCOE, and BALFOUR STEWART. II.-Edited by J. R. GREEN, M. A., Examiner in the School of Modern History at Oxford. Greece. Rome.. Europe.. HISTORY PRIMERS. M. CREIGHTON. C. A. FYFFE. Old Greek Life...J. P. MAHAFFY. .E. A. FREEMAN. ..... III.-Edited by J. R. GREEN, M. A. English Grammar..... J. PEILE. Shakespeare..........E. DOWDEN. (Others in preparation.) W. E. GLADSTONE. The object of these primers is to convey information in such a manner as to make it both intelligible and interesting to very young pupils, and so to discipline their minds as to incline them to more systematic after-studies. They are not only an aid to the pupil, but to the teacher, lightening the task of each by an agreeable, easy, and natural method of instruction. In the Science Series some simple experiments have been devised, leading up to the chief truths of each science. By this means the pupil's interest is excited, and the memory is impressed so as to retain without difficulty the facts brought under observation. The woodcuts which illustrate these primers serve the same purpose, embellishing and explaining the text at the same time. D. APPLETON & CO., 549 & 551 Broadway, New York. CONSISTING OF FIVE BOOKS. BY W. T. HARRIS, LL. D., A. J. RICKOFF, A. M., MARK BAILEY, A. 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The high rank which the authors have attained in the educational field and their long and successful experience in practical school-work especially fit them for the preparation of text-books that will embody all the best elements of mod ern educative ideas. In the schools of St. Louis and Cleveland, over which two of them have long presided, the subject of reading has received more than usual attention, and with results that have established for them a wide reputation for superior elocutionary discipline and accomplishments. Feeling the need of a series of reading-books harmonizing in all respects with the modes of instruction growing out of their long tentative work, they have carefully prepared these volumes in the belief that the special features enumerated will commend them to practical teachers everywhere. Of Professor Bailey, Instructor of Elocution in Yale College, it is needless to speak, for he is known throughout the Union as being without a peer in his profession. 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