"Sets forth the elements of its subject with a lucidity, clearness, and force unknown in the mathematical text-books ... is admirably fitted to serve students as an introduction on historical lines to the principles of mechanical science."—Canadian Mining and Mechanical Review, Ottawa, Can.

"A masterly book.... To any one who feels that he does not know as much as he ought to about physics, we can commend it most heartily as a scholarly and able treatise ... both interesting and profitable."—A. M. Wellington, in Engineering News, New York.

"The book as a whole is unique, and is a valuable addition to any library of science or philosophy.... Reproductions of quaint old portraits and vignettes give piquancy to the pages. The numerous marginal titles form a complete epitome of the work; and there is that invaluable adjunct, a good index. Altogether the publishers are to be congratulated upon producing a technical work that is thoroughly attractive in its make-up."—Prof. D. W. Hering, in Science.

"There is one other point upon which this volume should be commended, and that is the perfection of the translation. It is a common fault that books of the greatest interest and value in the original are oftenest butchered or made ridiculous by a clumsy translator. The present is a noteworthy exception."—Railway Age.

"The book is admirably printed and bound.... The presswork is unexcelled by any technical books that have come to our hands for some time, and the engravings and figures are all clearly and well executed."—Railroad Gazette.

[TESTIMONIALS OF PROMINENT EDUCATORS.]

"I am delighted with Professor Mach's Science of Mechanics."—M. E. Cooley, Professor of Mechanical Engineering, Ann Arbor, Mich.

"You have done a good service to science in publishing Mach's Science of Mechanics in English. I shall take every opportunity to recommend it to young students as a source of much interesting information and inspiration."—M. I. Pupin, Professor of Mechanics, Columbia College, New York.

"Mach's Science of Mechanics is an admirable ... book."—Prof. E. A. Fuertes, Director of the College of Civil Engineering of Cornell University, Ithaca, N. Y.