CONTENTS 



CHAPTER I 



PAGE 



WHAT LIFE is, AND WHENCE IT COMES . . i 



CHAPTER II 



SPECIES THEIR NUMBERS, VARIETY, AND DISTRIBUTION . n 



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 . r . . . . .93 



CHAPTER VII 



HEREDITY, VARIATION, INCREASE .... 101 



ix 



