_By W. STANLEY JEVONS, M. A., F. R. S._, Professor of Logic and Political Economy in the Owens College, Manchester. 1 vol., 12mo. Cloth. Price, $1.75. "He offers us what a clear-sighted, cool-headed, scientific student has to say on the nature, properties, and natural laws of money, without regard to local interests or national bias. His work is popularly written, and every page is replete with solid instruction of a kind that is just now lamentably needed by multitudes of our people who are victimized by the grossest fallacies."--_Popular Science Monthly._ "If Professor Jevons's book is read as extensively as it deserves to be, we shall have sounder views on the use and abuse of money, and more correct ideas on what a circulating medium really means."-- _Boston Saturday Evening Gazette._ "Professor Jevons writes in a sprightly but colorless style, without trace of either prejudice or mannerism, and shows no commitment to any theory. The time is not very far distant, we hope, when legislators will cease attempting to legislate upon money before they know what money is, and, as a possible help toward such a change, Professor Jevons deserves the credit of having made a useful contribution to a department of study long too much neglected, but of late years, we are gratified to say, becoming less so."--_The Financier, New York._ XVIII. The Nature of Light, WITH A GENERAL ACCOUNT OF PHYSICAL OPTICS. _By Dr. EUGENE LOMMEL_ (University of Erlangen). 1 vol., 12mo. Cloth. Price, $2.00. "In the present treatise, Professor Lommel has given an admirable outline of the nature of light and the laws of optics. "Unlike most other writers on this subject, the author has, we think, wisely postponed all reference to theories of the nature of light, until the laws of reflection, refraction, and absorption, have been clearly set before the reader. Then, in the fifteenth chapter, Professor Lommel discusses Fresnel's famous interference experiment, and leads the reader to see that the undulatory theory is the only conclusion that can be satisfactorily arrived at. A clear exposition is now given of Huyghen's theory, after which follow several chapters on the diffraction and polarization of light-bearing waves. "The reader is thus led onward much in the same way as the science itself has unfolded, and this, we think, is the surest and best way of teaching natural knowledge. "We have said enough to show that Professor Lommel's treatise is a useful contribution to the 'International Series'--a book that can thoroughly be understood and enjoyed by any intelligent reader who may not have had any special scientific training."--_Nature._