CONTENTS 9 



CHAPTER XII 



PAGE 



THE ALIMENTARY CANAL 276 



CHAPTER XIII 

 How ANIMALS DIGEST 294 



CHAPTER XIV 

 THE ABSORBENT SYSTEM 297 



CHAPTER XV 

 THE BLOOD OF ANIMALS . . 301 



CHAPTER XVI 

 THE CIRCULATION OF THE BLOOD 308 



CHAPTER XVII 

 How ANIMALS BREATHE 318 



A 



CHAPTER XVIII 

 SECRETION AND EXCRETION 329 



CHAPTER XIX 

 THE SKIN AND SKELETON 335 



CHAPTER XX 



How ANIMALS MOVE .......... 363 



1. Muscle 364 



2. Locomotion 366 



CHAPTER XXI 



THE NERVOUS SYSTEM 376 



1. The Senses 386 



2. Instinct and Intelligence . . . . . . . 395 



3. The Voices of Animals 399 



