x THE WORLD OF LIFE 



CHAPTER VIII 



PAGE 



Illustrative Cases of Natural Selection and Adapta- 

 tion . . . . . . .124 



CHAPTER IX 



The Importance of Recognition-Marks for Evolution. 156 



CHAPTER X 



The Earth's Surface- Changes as the Condition and 



Motive- Power of Organic Evolution . .173 



CHAPTER XI 



The Progressive Development of the Life-World, as 



shown by the Geological Record . . .188 



CHAPTER XII 



Life of the Tertiary Period . . . .219 



CHAPTER XIII 



Some Extensions of Darwin's Theory . . .252 



CHAPTER XIV 



Birds and Insects : as Proofs of an Organising and 



Directive Life-Principle .... 286 ' 



CHAPTER XV 



General Adaptations of Plants, Animals, and Man . 305 



CHAPTER XVI 



The Vegetable Kingdom in its Special Relation to Man 325 



