viii CONTENTS 



CHAPTER IX 



PAGE 



THE FOOD OF PLANTS, AND HOW THEY SECURE IT - 250 



CHAPTER X 

 THE PERPETUATION OF THE RACE - .... 96 



CHAPTER XI 

 THE DEFENCES OF PLANTS --.... 334 



CHAPTER XII 

 ECOLOGY : THE NEW FIELD BOTANY . . . -351 



INDEX ' 365 



