I think Mr. Youmans is entitled to great credit for the preparation of his Chart, because its use will not only facilitate acquisition, but, what is of far greater importance, will increase the exactness and precision of the student's elementary ideas. _From_ DR. JOHN W. DRAPER, _Professor of Chemistry in the University of N. Y._ Mr. Youmans' Chart seems to me well adapted to communicate to beginners a knowledge of the definite combinations of chemical substances, and as a preliminary to the use of symbols, to aid them very much in the recollection of the examples it contains. It deserves to be introduced into the schools. _From_ JAMES B. ROGERS, _Professor of Chemistry in the University of Pennsylvania_. We cordially subscribe to the opinion of Professor Draper concerning the value to beginners of Mr. Youmans' Chemical Chart. JOHN TORREY, _Professor of Chemistry in the College of Physicians & Surgeons, N. Y._ WM. H. ELLET, _Late Professor of Chemistry in Columbia College, S. C._ JAMES B. ROGERS, _Professor of Chemistry in the University of Pennsylvania._ _From_ BENJAMIN SILLIMAN, LL. D., _Professor of Chemistry in Yale College_. I have hastily examined Mr. Youmans' New Chemical Diagrams or Chart of chemical combinations by the union of the elements in atomic proportions. The design appears to be an excellent one. History of Philosophy. A History of Philosophy: AN EPITOME. BY DR. ALBERT SCHWEGLER. TRANSLATED FROM THE ORIGINAL GERMAN, BY JULIUS H. SEELYE. 12mo. 365 pages. Price $1 25. This translation is designed to supply a want long felt by both teachers and students in our American colleges. We have valuable histories of Philosophy in English, but no _manual_ on this subject so clear, concise, and comprehensive as the one now presented. Schwegler's work bears the marks of great learning, and is evidently written by one who has not only studied the original sources for such a history, but has thought out for himself the systems of which he treats. He has thus seized upon the real germ of each system, and traced its process of development with great clearness and accuracy. The whole history of speculation, from Thales to the present time, is presented in its consecutive order. This rich and important field of study, hitherto so greatly neglected, will, it is hoped, receive a new impulse among American students through Mr. Seelye's translation. It is a book, moreover, invaluable for reference, and should be in the possession of every public and private library. _From_ L. P. HICKOK, _Vice-President of Union College_.