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 
