"There was need for a book like this, which discusses the atomic theory both in its historic evolution and in its present form. And perhaps no man of this age could have been selected so able to perform the task in a masterly way as the illustrious French chemist, Adolph Wurtz. It is impossible to convey to the reader, in a notice like this, any adequate idea of the scope, lucid instructiveness, and scientific interest of Professor Wurtz's book. The modern problems of chemistry, which are commonly so obscure from imperfect exposition, are here made wonderfully clear and attractive."--_The Popular Science Monthly._ _Education as a Science._ By ALEXANDER BAIN, LL. D. 12mo. Cloth, $1.75. "This work must be pronounced the most remarkable discussion of educational problems which has been published in our day. It should be in the hands of every school-teacher and friend of education throughout the land."--_New York Sun._ _Suicide:_ An Essay in Comparative Moral Statistics. By HENRY MORSELLI, Professor of Psychological Medicine in the Royal University, Turin. 12mo. Cloth, $1.75. "A most valuable contribution to English literature touching a theme most distressing in the act and terrible in its consequences, yet to this hour but very imperfectly studied or understood."--_Philadelphia Times._ _Volcanoes:_ What they Are and what they Teach. By J. W. JUDD, Professor of Geology in the Royal School of Mines (London). With Ninety-six Illustrations. 12mo. Cloth, $2.00. "In no field has modern research been more fruitful than in that of which Professor Judd gives a popular account in the present volume. The great lines of dynamical, geological, and meteorological inquiry converge upon the grand problem of the interior constitution of the earth, and the vast influence of subterranean agencies.... His book is very far from being a mere dry description of volcanoes and their eruptions; it is rather a presentation of the terrestrial facts and laws with which volcanic phenomena are associated."--_Popular Science Monthly._ _The Sun:_ By C. A. YOUNG, Ph. D., LL. D., Professor of Astronomy in the College of New Jersey. With numerous Illustrations. Third edition, revised, with Supplementary Note. 12mo. Cloth, $2.00. The "Supplementary Note" gives important developments in solar astronomy since the publication of the second edition in 1882. "There is no rhetoric in his book; he trusts the grandeur of his theme to kindle interest and impress the feelings. His statements are plain, direct, clear, and condensed, though ample enough for his purpose, and the substance of what is generally wanted will be found accurately given in his pages."--_Popular Science Monthly._ _Illusions:_ A Psychological Study. By JAMES SULLY, author of "Sensation and Intuition," etc. 12mo. Cloth, $1.50.