CONTENTS 



CHAPTER I 

 Introduction H 



CHAPTER II 

 The Ecology of Roots 14 



CHAPTER III 

 The Ecology of Stems 27 



CHAPTER IV 

 The Ecology of Leaves 41 



CHAPTER V 

 Symbiosis— Disjunctive 55 



CHAPTER VI 

 Pollination ^5 



CHAPTER VII 

 Reciprocal Nutritive Disjunctive Symbiosis 73 



CHAPTER VIII 



Social Conjunctive Symbiosis 89 



CHAPTER IX 

 Nutritive Conjunctive Symbiosis J 01 



CHAPTER X 

 Physical Factors : Light 118 



CHAPTER XI 

 Heat 130 



CHAPTER XII 

 Air 138 



SOS It 



