CONTENTS ix 



CHAPTER XX 



PAOEB 



Types of Cryptogams ; Thallophytes ... . 235-276 



CHAPTER XXI 

 Types op Cryptogams ; Bryophytes . . 277-285 



CHAPTER XXII 

 Types of Cryptogams ; Pteridophytes 286-297 



CHAPTER XXIII 

 The Evolutionary History op Plants . . . 298-305 



Part II 



ECOLOGY, OB EBLATIONS OF PLANTS TO THE WORLD 

 ABOUT THEM 



CHAPTER XXIV 

 Plant Societies 307-323 



CHAPTER XXV 

 Botanical Geography 324-335 



CHAPTER XXVI 

 Parasites, Enslavid Plants, Messmates, Casnitorous Plants 386-344 



CHAPTER XXVII 

 Si^ How Plants Protect themselves from Animals . . 346-352 



