THE INTERNATIONAL SCIENTIFIC SERIES. Works already Published. I. THE FORMS OF WATER IN RAIN AND RIVERS, ICE AND GLACIERS. By J. TYNDALL, LL.D., F. R. S. With 26 Illustrations. Price, $1.50. " II. PHYSICS AND POLITICS; OR, THOUGHTS ON THE APPLICATION of IV. MIND AND BODY: THE THEORIES OF THEIR RELATIONS. By V. THE STUDY OF SOCIOLOGY. BY HERBERT SPENCER. Price, $1.50. VI. THE NEW, CHEMISTRY. BY PROFESSOR JOSIAH P. COOKE, of Harvard University. Illustrated. Price, $2.00. VII. ON THE CONSERVATION OF ENERGY. BY PROFESSOR BALFOUR STEWART. Fourteen Engravings. Price, $1.50. VIII. ANIMAL LOCOMOTION; OR, WALKING, SWIMMING, AND FLYING. By Dr. J. B. PETTIGREW, M. D., F. R. S. 119 Illustrations. Price, $1.75. IX. RESPONSIBILITY IN MENTAL DISEASE. By DR. HENRY MAUDSLEY. Price, $1.50. X. THE SCIENCE OF LAW. By PROFESSOR SHELDON AMOS. Price, $1.75. XI. ANIMAL MECHANISM; OR, AËRIAL AND TERRESTRIAL LOCOMOTION. By C. J. MAREY, Professor of the College of France; Member of the Academy of Medicine, Paris. 117 Engravings. PROFESSOR AT THE COLLEGE OF FRANCE, AND MEMBER OF THE WITH ONE Hundred anD SEVENTEEN ILLUSTRATIONS, DRAWN AND ENGRAVED UNDER NEW YORK: D. APPLETON AND COMPANY, 549 AND 551 BROADWAY. 1874. Levi's, Barbour OF FORCES IN THE INORGANIC KINGDOM AND AMONG Matter reveals itself by its properties-When matter acts, we con- clude that forces exist - Multiplicity of the forces formerly admitted; tendency to their reduction to one force in the inor- ganic kingdom-Indestructibility of force; its transformations -Vital forces, their multiplicity according to the ancient physiologists—Several vital forces are reduced to physical TRANSFORMATION OF PHYSICAL FORCES. To prove the indestructibility of forces, we must know how to measure them-Units of heat and of mechanical work-Ther- mo-dynamics-Measure of forces in living beings-Successive phases of the transformation of bodies; successive development Origin of animal heat—Lavoisier's theory-The perfecting of this theory-Estimates of the forces contained in aliment, and in the secreted products-Difficulty of these estimates—The force |