Prof. OGDEN N. ROOD (Columbia College, N. Y.). _Modern Chromatics and its Relations to Art and Industry._ Dr. EUGENE LOMMEL (University of Erlangen). _The Nature of Light._ Prof. J. ROSENTHAL. _General Physiology of Muscles and Nerves._ Prof. JAMES D. DANA, M. A., LL. D. _On Cephalization; or, Head-characters in the Gradation and Progress of Life._ Prof. S. W. JOHNSON, M. A. _On the Nutrition of Plants._ Prof. AUSTIN FLINT, Jr., M. D. _The Nervous System, and its Relation to the Bodily Functions._ Prof. BERNSTEIN (University of Halle). _The Five Senses of Man._ Prof. FERDINAND COHN (Breslau University). _Thallophytes (Algæ, Lichens, Fungi)._ Prof. HERMANN (University of Zurich). _Respiration._ Prof. LEUCKART (University of Leipsic). _Outlines of Animal Organization._ Prof. LIEBREICH (University of Berlin). _Outlines of Toxicology._ Prof. KUNDT (University of Strasburg). _On Sound._ Prof. REES (University of Erlangen). _On Parasitic Plants._ Prof. STEINTHAL (University of Berlin). _Outlines of the Science of Language._ P. BERT (Professor of Physiology, Paris). _Forms of Life and other Cosmical Conditions._ E. ALGLAVE (Professor of Constitutional and Administrative Law at Douai, and of Political Economy at Lille). _The Primitive Elements of Political Constitutions._ P. LORAIN (Professor of Medicine, Paris). _Modern Epidemics._ Prof. SCHUTZENBERGER (Director of the Chemical Laboratory at the Sorbonne). _On Fermentations._ Mons. FREIDEL. _The Functions of Organic Chemistry._ Mons. DEBRAY. _Precious Metals._ Prof. CORFIELD, M. A., M. D. (Oxon.). _Air in its Relation to Health._ Prof. A. GIARD. _General Embryology._ D. APPLETON & CO., PUBLISHERS, 549 & 551 Broadway, N. Y. A New Magazine for Students and Cultivated Readers. THE POPULAR SCIENCE MONTHLY, CONDUCTED BY Professor E. L. YOUMANS. The growing importance of scientific knowledge to all classes of the community calls for more efficient means of diffusing it. THE POPULAR SCIENCE MONTHLY has been started to promote this object, and supplies a want met by no other periodical in the United States. It contains instructive and attractive articles, and abstracts of articles, original, selected, and illustrated, from the leading scientific men of different countries, giving the latest interpretations of natural phenomena, explaining the applications of science to the practical arts, and to the operations of domestic life. It is designed to give especial prominence to those branches of science which help to a better understanding of the nature of man; to present the claims of scientific education; and the bearings of science upon questions of society and government. How the various subjects of current opinion are affected by the advance of scientific inquiry will also be considered.