vi CONTENTS 



CHAPTER III 



PAGE 



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 



CHAPTEE IV 



On Plant Life 115 



Structure of Flowers 128 



Insects and Flowers 134 



Past History of Flowers 136 



Fruits and Seeds 137 



Leaves 138 



Aquatic Plants 144 



On Hairs .^48 



Influence of Soil 151 



On Seedlings 152 



Sleep of Plants 152 



Behaviour of Leaves in Rain 155 



Mimicry 156 



Ants and Plants 156 



