In the text no mathematics higher than elementary algebra and geometry is introduced; in the foot-notes and in the Appendix an occasional trigonometric formula appears, for the benefit of the very considerable number of High school students who understand such expressions. G.B. Merriman, formerly Prof. of Mathemutics and Astronomy, Rutgers College, New Brunswick, N.J.: "For a short course in elementary astronomy, it is by far the best book I have ever examined." Warren Mann, State Normal School, Potsdam, N. Y.: "Accuracy in use of terms is a marked feature. I consider it the best text-book on this subject." H.N. Chute, High School, Ann Arbor, Mich.: "It is just the book the scholars have been waiting for." G.H. Howe, State Normal School, Warrensburg, MO.: "It is indeed an admirable book, up to the times, clear, and complete." Jeremiah Slocum, South Division High School, C&ugo, Ill.: "It is well adapted both as to scope and manner of treatment to high-school work." Ray G. Huling, Prin. of English High School, Cambridge, Mass.: "It is delightfully fresh, full, and clear." A.S. Roe, recently of High School, Worcester, Muss.: "The book is extended enough to please the exacting teacher." I.P. Bishop, State Normal School, Buffalo, N.Y.: "The book seems to have all the essentials of a first-class text for high school work; viz., conciseness, clearness, and the results of recent research." YOUNG'S GENERAL ASTRONOMY A Text-book for Colleges and Technical Schools. By CHARLES A . YOUNG, Professor of Astronomy in the College of New Jersey. 8vo. viii + 551 pages. Half morocco. Illustrated with over 250 cuts and and diagrams, and supplemented with the necessary tables. Mailing price, $2.50; for introduction, $2.25. In amount, the work has been adjusted as closely as possible to the prevailing courses of study in our colleges. By omitting the fine print, a briefer course may be arranged. The eminence of Professor Young as an original investigator in astronomy, a lecturer and writer on the subject, and an instructor of college classes, and his scrupulous care in preparing this volume, led the publishers to present the work with the highest confidence; and this confidence has been fully justified by the event. More than one hundred colleges adopted the work within a year from its publication, and it is conceded to be the best astronomical text-book of its grade to be found anywhere. Edw. C. Pickering, Prof. of Astronomy, Harvard University: "I think this work the best of its kind, and admirably adapted to its purpose." S.P. Langley, Sec. Smithsonian Inst., Washington, D.C.: "I know no better book (not to say as good a one) for its purpose, on the subject." AN INTRODUCTION TO SPHERICAL AND PRACTICAL ASTRONOMY By DASCOM GREENE, Professor of Mathematics and Astronomy in the Rensselaer Polytechnic Institute, Troy, N.Y. NW. Cloth. Illustrated. viii + 158 pages. Mailing price, $1.60; for introduction, $1.50.