This is an excellent text-book for High Schools and Academies, and for elementary classes in Colleges. The strictly inductive method here followed, together with the insertion of numerous questions that must cause the student to do his own reasoning from the observations, renders this book particularly useful. T.H. Norton, Professor of Chemistry, University of Cincinnati, Cincinnati, Ohio.: "I am greatly pleased with the plan and its execution. It is an admirable arrangement for our inductive course in chemistry and should not fail to yield good results." A STUDENTS' MANUAL OF A LABORATORY COURSE IN PHYSICAL MEASUREMENTS By Wallace C. Sabine, Assistant Professor of Physics, Harvard University. 8vo. Cloth. ix + 126 pages. Mailing price, $1.35; for introduction, $1.25. This manual, which is intended for use in supplementing college courses in physics, contains an outline of seventy experiments, arranged with special regard to a systematic and progressive development of the subject. Le Roy C. Cooley, Professor of Physics, Vassar College: "I have examined it and am ready to commend it." J.F. Woodhull, Professor of Sciences, Teachers' College, New York: "I find Sabine's Laboratory Manual a thoroughly good thing." HIGH SCHOOL LABORATORY MANUAL OF PHYSICS By Dudley G. Hays, Charles D. Lowry, and Austin C. Rishel, Teachers of Physics in the Chicago High Schools. 8vo. Cloth. iv + 154 pages. Mailing price, 60 cents; for introduction, 50 cents. This manual has been written: First, to present a logically arranged course of experimental work covering the ground of Elementary Physics. Second, to provide sufficient laboratory work to meet college entrance requirements. The experiments are largely quantitative, but qualitative work is introduced. W.S. Jackman, Teacher of Science, Cook Co. Normal School, Englewood, Ill.: "It is a most excellent manual, and I believe it meets the needs of high schools on this subject better than any other book I have seen." YOUNG'S LESSONS IN ASTRONOMY Including Uranography. Revised Edition. By CHARLES A. YOUNG, Professor of Astronomy in the College of New Jersey. 12mo. Cloth. Illustrated. ix + 357 pages, exclusive of four double-page star maps. By mail, $1.30; for introduction, $1.20.