43. SCIENCE OF POLITICS. By SHELDON AMOS. $1.75. 44. ANIMAL INTELLIGENCE. By GEORGE J. ROMANES. $1.75. 45. MAN BEFORE METALS. By N. JOLY, Correspondent of the Institute. With 148 Illustrations. $1.75. 46. THE ORGANS OF SPEECH AND THEIR APPLICATION IN THE FORMATION OF ARTICULATE SOUNDS. By G. H. VON MEYER, Professor in Ordinary of Anatomy at the University of Zürich. With 47 Woodcuts. $1.75. 47. FALLACIES: A View of Logic from the Practical Side. By ALFRED SIDGWICK, B. A., Oxon. $1.75. 48. ORIGIN OF CULTIVATED PLANTS. By ALPHONSE DE CANDOLLE. $2.00. 49. JELLY-FISH, STAR-FISH, AND SEA-URCHINS. Being a Research on Primitive Nervous Systems. By GEORGE J. ROMANES. $1.75. 50. THE COMMON SENSE OF THE EXACT SCIENCES. By the late WILLIAM KINGDON CLIFFORD. $1.50. 51. PHYSICAL EXPRESSION: Its Modes and Principles. By FRANCIS WARNER, M. D., Assistant Physician, and Lecturer on Botany to the London Hospital, etc. With 51 Illustrations. $1.75. 52. ANTHROPOID APES. By ROBERT HARTMANN, Professor in the University of Berlin. With 63 Illustrations. $1.75. 53. THE MAMMALIA IN THEIR RELATION TO PRIMEVAL TIMES. By OSCAR SCHMIDT. $1.50. New York: D. APPLETON & CO., 1, 3, & 5 Bond Street. [Illustration: THE GRECIAN IDEA OF THE STEAM-ENGINE.] THE INTERNATIONAL SCIENTIFIC SERIES. A HISTORY OF THE GROWTH OF THE STEAM-ENGINE. BY ROBERT H. THURSTON, A. M., C. E., PROFESSOR OF ENGINEERING STEVENS INSTITUTE OF TECHNOLOGY, PAST PRESIDENT AMERICAN SOCIETY MECHANICAL ENGINEERS, MEMBER OF SOCIETY OF CIVIL ENGINEERS, SOCIÉTÉ DES INGÉNIEURS CIVILS, VEREIN DEUTSCHE INGENIEURE, OESTERREICHISCHER INGENIEUR- UND ARCHITEKTEN-VEREIN; ASSOCIATE BRITISH INSTITUTION OF NAVAL ARCHITECTS, ETC., ETC. _SECOND REVISED EDITION._ NEW YORK: D. APPLETON AND COMPANY, 1, 3, AND 5 BOND STREET. 1886. COPYRIGHT, 1878, 1884, BY ROBERT H. THURSTON. PREFACE. This little work embodies the more generally interesting portions of lectures first written for delivery at the STEVENS INSTITUTE OF TECHNOLOGY, in the winter of 1871-'72, to a mixed audience, composed, however, principally of engineers by profession, and of mechanics; it comprises, also, some material prepared for other occasions.