IV CONTENTS. 



PAGE 



Taking up of Pollen by Insects, - - 243 



Deposition of Pollen, 276 



The Crossing of Flowers, - 287 



Autogamy, 331 



Fertilization and Formation of Fruit in Phanerogams, - 401 



3. Change in Eeproductive Methods- 

 Fruits Eeplaced by Offshoots, - - - 452 

 Parthenogenesis, - 463 

 Heteromorphism and Alternation of Generations, - 469 



The History of Species. 



1. The Nature of Species — 



Definition of Species, .... 486 



The Specific Constitution of Protoplasm, - .... 487 



2. Alteration in the Form of Species — 



Dependence of Plant Form on Soil and Climate, .... 495 



