CONTENTS 



CHAPTER 



I. Plant Life in Geneila.l 



17 



18 



19 

 20 

 21 

 22 



23 

 24 



Index 



Leaves and Their Structures . 



The Manufacture of Food 



Leaves in Relation to Light 



The Water Relations of Lea\'es 



Leaf Coloration and the Fall of Leaves 



Digestion, Transfer, and Accumulation of Foods 



The Utilization of Foods 



Herbs, Shrubs, and Trees 



Stems and Their External Features 



The Structures and Processes of Stems 



The En\'ironment of Plants 



Ecological Groups of Stems 



The Structures and Processes of Roots 



Roots and Their Environment . ' . 



Reproduction in Flowering Plants : Flowers, Fruits 



AND Seeds 



Reproduction in Relation to Agriculture 

 The Alg^ .... 

 Bacteria and Fungi . 



Li\'ERWORTS ANT) ]\IOSSES 



The Ferns and Their Allies 

 Seed Plants: Gymnosperms 

 Seed Plants : Angiosperms 

 The Evolution of Plants 



PAGE 

 I 



13 



25 



37 

 48 

 63 

 74 

 82 



94 

 102 

 118 

 139 

 154 

 166 

 182 



197 



217 



234 

 249 

 272 

 283 

 294 



303 

 318 



33^ 



