"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. "I congratulate you upon producing the work in such good style and in so good a translation. I bought a copy of it a year ago, very shortly after you issued it. The book itself is deserving of the highest admiration; and you are entitled to the thanks of all English-speaking physicists for the publication of this translation."--_D. W. Hering_, Professor of Physics, University of the City of New York, New York. "I have read Mach's _Science of Mechanics_ with great pleasure. The book is exceedingly interesting."--_W. F. Magie_, Professor of Physics, Princeton University, Princeton, N. J.