CONTENTS 



CHAPTER I 



PAGE 



INTRODUCTION 1 



CHAPTER II 

 THE CONDITIONS OF PLANT LIFE 17 



CHAPTER III 

 THE SIMPLEST FORMS OF LIFE 31 



CHAPTER IV 

 ALG^E ........... 



CHAPTER V 

 FUNGI 80 



CHAPTER VI 

 MOSSES AND LIVERWORTS (BRYOPHYTA) .... 101 



CHAPTER VH 

 THE FERNS (PTERIDOPHYTA) 122 



CHAPTER VIII 



PTERIDOPHYTA (Concluded} 139 



vii 



