X THE WORLD OF LIPE 



CHAPTEE IX ' 



PAGE 



The Importance of Eecognition-marks in Evolution . . .168 



CHAPTEE X 



The Earth's Surface-changes the Motive Power of Evolution 187 



CHAPTEE XI 



The Progressive Development of the Life-World as shown 

 by the Geological Eecord 303 



CHAPTEE XII 

 Life of the Tertiary Period 235 



CHAPTEE XIII 

 Some Extensions of Darwin's Theory ....... 371 



CHAPTEE XIY 



Birds and Insects as Proofs of an Organising and Directive 

 Life-principle 309 



CHAPTEE XV 



General Adaptation of Plants, Animals, and Man . . . .321) 



CHAPTEE XVI 



The Vegetable Kingdom in its special Eelation to Man . . 350 



CHAPTEE XVII 

 The Mystery of the Cell 361 



