ILLUSTRATIONS 



PAGE 



Hecatgeus' Map of the World, 517 B.C 34 



Herodotus' Map of the Worl ] . . 57 



Behaim's Globe, 1492 A.D 190 



The Copernican System 198 



Tycho Brahe's Quadrant opposite 204 



Uraniborg opposite 206 



Kepler opposite 210 



Galileo opposite 217 



Galileo's Dialogue . . . opposite 224 



Stevinus' Triangle 252 



Huygens opposite 286 



Huygens' Clock opposite 288 



Newton's Telescope and Newton's Theory of the Rainbow opposite 292 

 Sketch Map of Places Important in Ancient and Medieval 



Science opposite 448 



xv 



