CONTENTS. vii 



CHAPTER XXVII. 



PAGE. 



Matter and Force 381 



CHAPTER XXVIII. 

 Scientific Materialism 398 



CHAPTER XXIX. 

 An Address to Students 410 



CHAPTER XXX. 



Scientific Use of the Imagination 417 



CHAPTER XXXI. 

 The Belfast Address 443 



CHAPTER XXXII. 

 Apology for the Belfast Address 494 



CHAPTER XXXIII. 

 The Rev. James Martineau and the Belfast Address 511 



CHAPTER XXXIV. 

 Fermentation, and Its Bearings on Surgery and Medicine 532 



CHAPTER XXXV. 

 Spontaneous Generation 562 



CHAPTER XXXVI. 

 Science and Man 596 



CHAPTER XXXVII. 

 Professor Virchow and Evolution 625 



CHAPTER XXXVIII. 

 The Electric Light 660 



