Mr. J. N. LOCKYER, F.R.S., _Spectrum Analysis._ Prof. MICHAEL FOSTER, M.D., _Protoplasm and the Cell Theory._ Prof. W. STANLEY JEVONS, _Money: and the Mechanism of Exchange._ H. CHARLTON BASTIAN, M.D., F.R.S., _The Brain as an Organ of Mind._ Prof. A. C. RAMSAY, LL. D., F.R.S., _Earth Sculpture: Hills, Valleys, Mountains, Plains, Rivers, Lakes; how they were produced, and how they have been destroyed._ Prof. RUDOLPH VIRCHOW (Berlin University), _Morbid Physiological Action._ Prof. CLAUDE BERNARD, _Physical and Metaphysical Phenomena of life._ Prof. H. SAINTE-CLAIRE DEVILLE, _An Introduction to General Chemistry._ Prof. WURTZ, _Atoms and the Atomic Theory._ Prof. DE QUATREFAGES, _The Negro Races._ Prof. LACAZE-DUTHIERS, _Zoology since Cuvier._ Prof. BERTHELOT, _Chemical Synthesis._ 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. W. D. WHITNEY, _Modern Linguistic Science._ Prof. C. A. YOUNG, Ph. D. (of Dartmouth College), _The Sun._ Prof. BERNSTEIN (University of Halle), _Physiology of the Senses._ Prof. FERDINAND COHN (Breslau University), _Thallophytes (Algæe, 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._ 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. SCHÜTZENBERGER (Director of the Chemical Laboratory at the Sorbonne), _On Fermentations._ Mons. DEBRAY, _Precious Metals._ _Opinions of the Press on the "International Scientific Series."_ I. Tyndall's Forms of Water. 1 vol., 12mo. Cloth. Illustrated Price, $1.50. "In the volume now published, Professor Tyndall has presented a noble illustration of the acuteness and subtlety of his intellectual powers, the scope and insight of his scientific vision, his singular command of the appropriate language of exposition, and the peculiar vivacity and grace with which he unfolds the results of intricate scientific research."--_N. Y. Tribune_.