viii CONTENTS 



PART II. RESISTANCE TO HEAT AND COLD 



PAGE 



65. Supra-maximal Temperatures 224 



66. Freezing and Cold-rigor . 232 



67. The Formation of Ice in Plants . . . 239 



68. How Cold causes Death 244 



PART III. THE POWER OF RESISTANCE TO LIGHT 



69. The Injurious Action of Light 247 



PART IV. THE EFFECTS OF THE WITHDRAWAL OF WATER 



70. Desiccation 249 



71. Osmotic Agencies 256 



PART V. CHEMICAL AGENCIES 



72. The General Properties of Poisons 258 



73. The Detailed Action of Poisons 264 



74- (continued] 267 



75. The Influence of Chemical Constitution on Poisonous Action . . . 271 



INDEX . .... 275 



