CONTENTS ix 



CHAPTER X 



VITALITY 



1. Persistence of a complex specific metabolism and of a correspond- 

 ing specific organisation 2. The capacity for growth, repro- 

 duction, and development 3. Effective behaviour, registration, 

 of experience and variability 4. Organism and mechanism 

 5. The uniqueness of life .... pp. 180-187 



PART II 



STRUCTURE AND CLASSIFICATION OF 



ANIMALS 



CHAPTER XI 



THE ELEMENTS OF STRUCTURE 



1. The resemblances and contrasts between plants and animals 2. 

 The relation of the simplest animals to those which are more 

 complex 3. Structural analysis of the animal body : organs, 

 tissues, cells, and protoplasm 4. Organs and organelles 5. 

 Classification of organs 6. Correlation of organs 7. Homology, 

 analogy, and convergence 8. Change of function 9. Substi- 

 tution of organs 10. Vestigial organs 11. Adaptation in 

 organs ........ pp. 188-218 



CHAPTER XII 



BACKBONELESS ANIMALS 



1. Protozoa 2. Sponges 3. Stinging-animals or Ccelentera 4. 

 " Worms " 5. Echinoderms 6. Arthropods 7. Molluscs 



pp. 219-264 



CHAPTER XIII 



BACKBONED ANIMALS 



1. Enteropneusts 2. Tunicates 3. Lancelots 4. Round-mouths 

 or Cyclostomes 5. Fishes 6. Amphibians 7. Reptiles 8. 

 Birds 9. Mammals ..... pp. 265-297 



