CONTENTS 



CHAP. 



PAGE 



XVII. CONTRIBUTIONS TO MOLECULAR PHYSICS . . . .407 



XVIII. LIFE AND LETTERS OF FARADAY ..... ,420 



XIX. THE COPLEY MEDALIST OF 1870 ...... 444 



XX. THE COPLEY MEDALIST OF 1871 ...... 451 



XXI. DEATH BY LIGHTNING ...,. , 462 



XXII. SCIENCE AND THE * 'SPIRITS" . . . . . ,467 



