CONTENTS xi 



CHAPTER XVIII 



PAST HISTORY 



1. The two records 2. Imperfection of the geological record 3. 

 Palaeontological series 4. Extinction of types 5. Relative 

 antiquity of animals 6. Great steps in evolution 7. The 

 ascent of man . ... . . . pp. 346-361 



CHAPTER XIX 



HEREDITY 



1. The facts of heredity 2. Theories of heredity historical re- 

 trospect. 3. The idea of the continuity of generations 4. 

 Modes of inheritance 5. Social and ethical aspects 



pp. 362-382 



CHAPTER XX 



THE INFLUENCE OF FUNCTION AND ENVIRONMENT 



1. The influence of function 2. The influence of surroundings 

 3. The transmissibility of acquired characters or somatic 

 modifications 4. The importance of nurture 5. The other 

 side of heredity ...... pp. 383-410 



CHAPTER XXI 



THE EVOLUTION OF EVOLUTION THEORIES 



1. Early Greek philosophers 2. Aristotle 3. Lucretius 4. Evolu- 

 tionists before Darwin 5. Three old masters : Buffon, Erasmus 

 Darwin, Lamarck 6. Charles Darwin 7. Darwin's fellow- 

 workers 8. Steps of progress since Darwin's day and summary 

 of evolution theories ..... pp. 411-431 



APPENDIX : SOME USEFUL BOOKS DEALING WITH ANIMAL LIFE 



pp. 433-458 



INDEX pp. 459-477 



