"The volume before us has been carefully edited, augmented to nearly twice the bulk of the former edition, and all the most recent matter has been added.... It is a valuable text-book."—Nature.

"Candidates for pass examinations will find it, we think, specially suited to their requirements."—English Mechanic.

THE HANDBOOK OF HEAT. Edited and almost entirely Rewritten by Benjamin Loewy, F.R.A.S., &c. 117 Illusts. Post 8vo, 6s. cloth.

"The style is always clear and precise, and conveys instruction without leaving any cloudiness or lurking doubts behind."—Engineering.

"A most exhaustive book on the subject on which it treats, and is so arranged that it can be understood by all who desire to attain an accurate knowledge of physical science.... Mr. Loewy has included all the latest discoveries in the varied laws and effects of heat."—Standard.

"A complete and handy text-book for the use of students and general readers."—English Mechanic.

THE HANDBOOK OF OPTICS. By Dionysius Lardner, D.C.L., formerly Professor of Natural Philosophy and Astronomy in University College, London. New Edition. Edited by T. Olver Harding, B.A. Lond., of University College, London. With 298 Illustrations. Small 8vo, 448 pages, 5s. cloth.

"Written by one of the ablest English scientific writers, beautifully and elaborately illustrated."—Mechanic's Magazine.

THE HANDBOOK OF ELECTRICITY, MAGNETISM, AND ACOUSTICS. By Dr. Lardner. Ninth Thousand. Edit. by George Carey Foster, B.A., F.C.S. With 400 Illustrations. Small 8vo, 5s. cloth.

"The book could not have been entrusted to anyone better calculated to preserve the terse and lucid style of Lardner, while correcting his errors and bringing up his work to the present state of scientific knowledge."—Popular Science Review.