O. S. WESCOTT, _Prin. North Division H. Sch., Chicago_: My chemistry professor says it is the most satisfactory thing he has seen, and hopes we may be able to have it in future. _Laboratory Manual of General Chemistry._ By R. P. WILLIAMS, Instructor in Chemistry, English High School, Boston, and author of _Introduction to Chemical Science_. 12mo. Boards. xvi + 200 pages. Mailing Price, 30 cents; for Introduction, 25 cents. This Manual, prepared especially to accompany the author's _Introduction to Chemical Science_, but suitable for use with any text-book of chemistry, gives directions for performing one hundred of the more important experiments in general chemistry and metal analysis, with blanks and a model for the same, lists of apparatus and chemicals, etc. The Manual is commended as well-designed, simple, convenient, and cheap,--a practical book that classes in chemistry need. W. M. STINE, _Prof. of Chemistry, Ohio University, Athens, O._: It is a work that has my heartiest endorsement. I consider it thoroughly pedagogical in its principles, and its use must certainly give the student the greatest benefit from his chemical drill. (_Dec. 30, 1888._) _Young's General Astronomy._ A Text-book for colleges and technical schools. By CHARLES A. YOUNG, Ph.D., LL.D., Professor of Astronomy in the College of New Jersey, and author of _The Sun_, etc. 8vo. viii + 551 pages. Half-morocco. Illustrated with over 250 cuts and diagrams, and supplemented with the necessary tables. Introduction Price, $2.25. Allowance for an old book in exchange, 40 cents. The OBJECT of the author has been twofold. First and chiefly, to make a book adapted for use in the college class-room; and, secondly, to make one valuable as a permanent storehouse and directory of information for the student's use after he has finished his prescribed course. The METHOD of treatment corresponds with the object of the book. Truth, accuracy, and order have been aimed at first, with clearness and freedom from ambiguity. In AMOUNT, the work has been adjusted as closely as possible to the prevailing courses of study in our colleges. The fine print may be omitted from the regular lessons and used as collateral reading. It is important to anything like a complete view of the subject, but not essential to a course. Some entire chapters can be omitted, if necessary. NEW TOPICS, as indicated above, have received a full share of attention, and while the book makes no claims to novelty, the name of the author is a guarantee of much originality both of matter and manner. The book will be found especially well adapted for high school and academy teachers who desire a work for reference in supplementing their brief courses. The illustrations are mostly new, and prepared expressly for this work. The tables in the appendix are from the latest and most trustworthy sources. A very full and carefully prepared index will be found at the end.