CONTENTS 



CHAPTER I 



PAGE 



What Life is, and Whence it Comes . . i 



CHAPTER II 

 Species — their Numbers, Variety, and Distribution . 1 1 



CHAPTER III 



The Numerical Distribution of British Plants : 



Temperate Floras Compared . . . .22 



CHAPTER IV 



The Tropical Floras of the World . . .40 



CHAPTER V 



The Distribution of Animals . . . .83 



CHAPTER VI 



The Numerical Distribution of Species in Relation to 



Evolution . . . . . -93 



CHAPTER VII 



Heredity, Variation, Increase . . . .101 



ix 



