x CONTENTS 



XIII. THE SCIENTIST SIR HUMPHRY DAVY . . 170 



XIV. SCIENTIFIC PREDICTION THE DISCOVERY 



OF NEPTUNE 184 



XV. SCIENCE AND TRAVEL THE VOYAGE OF 



THE BEAGLE 197 



XVI. SCIENCE AND WAR PASTEUR, LISTER . . 213 



XVII. SCIENCE AND INVENTION LANGLEY'S AERO- 

 PLANE 231 



XVEU. SCIENTIFIC HYPOTHESIS RADIOACTIVE SUB- 

 STANCES 245 



XIX. THE SCIENTIFIC IMAGINATION 258 



XX. SCIENCE AND DEMOCRATIC CULTURE . . . 270 

 INDEX . 283 



