CONTENTS. INTRODUCTION. PTOLEMY. COPERNICUS. TYCHO BRAHE. GALILEO. KEPLER. ISAAC NEWTON. FLAMSTEED. HALLEY. BRADLEY. WILLIAM HERSCHEL. LAPLACE. BRINKLEY. JOHN HERSCHEL. THE EARL OF ROSSE. AIRY. HAMILTON. LE VERRIER. ADAMS. LIST OF ILLUSTRATIONS. THE OBSERVATORY, GREENWICH. PTOLEMY. PTOLEMY'S PLANETARY SCHEME. PTOLEMY'S THEORY OF THE MOVEMENT OF MARS. THORN, FROM AN OLD PRINT. COPERNICUS. FRAUENBURG, FROM AN OLD PRINT. EXPLANATION OF PLANETARY MOVEMENTS. TYCHO BRAHE. TYCHO'S CROSS STAFF. TYCHO'S "NEW STAR" SEXTANT OF 1572. TYCHO'S TRIGONIC SEXTANT. TYCHO'S ASTRONOMIC SEXTANT. TYCHO'S EQUATORIAL ARMILLARY. THE GREAT AUGSBURG QUADRANT. TYCHO'S "NEW SCHEME OF THE TERRESTRIAL SYSTEM," 1577. URANIBORG AND ITS GROUNDS. GROUND-PLAN OF THE OBSERVATORY. THE OBSERVATORY OF URANIBORG, ISLAND OF HVEN. EFFIGY ON TYCHO'S TOMB AT PRAGUE. By Permission of Messrs. A. & C. Black. TYCHO'S MURAL QUADRANT, URANIBORG. GALILEO'S PENDULUM. GALILEO. THE VILLA ARCETRI. FACSIMILE SKETCH OF LUNAR SURFACE BY GALILEO. CREST OF GALILEO'S FAMILY. KEPLER'S SYSTEM OF REGULAR SOLIDS. KEPLER. SYMBOLICAL REPRESENTATION OF THE PLANETARY SYSTEM. THE COMMEMORATION OF THE RUDOLPHINE TABLES. WOOLSTHORPE MANOR. TRINITY COLLEGE, CAMBRIDGE. DIAGRAM OF A SUNBEAM. ISAAC NEWTON. SIR ISAAC NEWTON'S LITTLE REFLECTOR. SIR ISAAC NEWTON'S SUN-DIAL. SIR ISAAC NEWTON'S TELESCOPE. SIR ISAAC NEWTON'S ASTROLABE. SIR ISAAC NEWTON'S SUN-DIAL IN THE ROYAL SOCIETY. FLAMSTEED'S HOUSE. FLAMSTEED. HALLEY. GREENWICH OBSERVATORY IN HALLEY'S TIME. 7, NEW KING STREET, BATH. From a Photograph by John Poole, Bath. WILLIAM HERSCHEL. CAROLINE HERSCHEL. STREET VIEW, HERSCHEL HOUSE, SLOUGH. From a Photograph by Hill & Saunders, Eton. GARDEN VIEW, HERSCHEL HOUSE, SLOUGH. From a Photograph by Hill & Saunders, Eton. OBSERVATORY, HERSCHEL HOUSE, SLOUGH. From a Photograph by Hill & Saunders, Eton. THE 40-FOOT TELESCOPE, HERSCHEL HOUSE, SLOUGH. From a Photograph by Hill & Saunders, Eton. LAPLACE. THE OBSERVATORY, DUNSINK. From a Photograph by W. Lawrence, Dublin. ASTRONOMETER MADE BY SIR JOHN HERSCHEL. SIR JOHN HERSCHEL. NEBULA IN SOUTHERN HEMISPHERE. THE CLUSTER IN THE CENTAUR. OBSERVATORY AT FELDHAUSEN. GRANITE COLUMN AT FELDHAUSEN. THE EARL OF ROSSE. BIRR CASTLE. From a Photograph by W. Lawrence, Dublin. THE MALL, PARSONSTOWN. From a Photograph by W. Lawrence, Dublin. LORD ROSSE'S TELESCOPE. From a Photograph by W. Lawrence, Dublin. ROMAN CATHOLIC CHURCH, PARSONSTOWN. From a Photograph by W. Lawrence, Dublin. AIRY. From a Photograph by E.P. Adams, Greenwich. HAMILTON. ADAMS. THE OBSERVATORY, CAMBRIDGE.

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