ILLUSTRATIONS 



SIR ISAAC NEWTON Frontispiece 



DIAGRAM TO ILLUSTRATE ALHAZEN's MEASUREMENT OP 



THE HEIGHT OF THE ATMOSPHERE Facing p. 2O 



. o 



ROGER BACON 



NICOLAUS COPERNICUS 54 



TYCHO BRAKE'S QUADRANT 



" T2 



JOHANN KEPLER " 



KEPLER'S MECHANISM TO ILLUSTRATE HIS (INCORRECT) 

 EARLY THEORY AS TO THE ORBITS OF THE PLANETARY 



" TA 



BODIES ' 4 



GALILEO GALILEI 7 8 



FRONTISPIECE OF GALILEO'S " SYSTEMA COSMICUM " . . 82 



GALILEO BEFORE THE TRIBUNAL 9 



** j /j O 



BLAISE PASCAL 



WILLIAM HARVEY X 7 



FRANCIS BACON J 9 2 



RENE DESCARTES X 9 4 



GOTTFRIED WILHELM VON LEIBNITZ IQ^ 



VIEW IN THE LIBRARY OF THE ROYAL SOCIETY .... 206 



VON GUERICKE'S AIR-PUMP 2I2 



REPRODUCTION OF A PLATE IN HOOKE's "MICROSCOPI- 

 CAL OBSERVATIONS" 2l6 



ROBERT HOOKE'S MICROSCOPE 2l8 



ix 



