CONTENTS 



CHAPTER III 



On Animal Life — continued 71 



Freedom of Animals 73 



Sleep 78 



Senses 84 



Sense of Direction 93 



Number of Species 96 



Importance of the Smaller Animals ... 97 



Size of Animals 100 



Complexity of Animal Structure .... 101 



Length of Life 102 



On Individuality 104 



Animal Immortality 112 



