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 The Works of Professor E. L. YOUMANS, M. D. Class-book of Chemistry. New edition.

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The Culture demanded by Modern Life. A Series of Addresses and Arguments on the Claims of Scientific Education. Edited, with an Introduction on Mental Discipline in Education.

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Correlation and Conservation of Forces. A Series of Expositions by Professor Grove, Professor Helmholtz, Dr. Mayer, Dr. Faraday, Professor Liebig, and Dr. Carpenter. Edited, with an Introduction and Brief Biographical Notices of Chief Promoters of the New Views, by Edward L. Youmans, M. D. 1 vol, 12mo. Cloth, $2.00.

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Containing instructive and interesting articles and abstracts of articles, original, selected, and illustrated, from the pens of the leading scientific men of different countries ; Accounts of important scientific discoveries ; The application of science to the practical arts; The latest views put forth concerning natural phenomena, by savants of the highest authority. Terms : Five dollars per annum ; or fifty cents per number. A Club of five will be sent to any address for $20.00 per annum. The volumes begin May and November of each year. Subscriptions may begin at any time. The Popular Science Monthly and Appletons’ Journal, together, for $L00 per annum, postage prepaid. D. APPLETON & CO., Publishers, 1, 3, & 5 Bond Street, New York.