CONTENTS 



PAGE 



CHAPTER I. THE COSMICAL RELATIONS OF LIVING MATTER ... 17 



CHAPTER II. THE ORIGIN OF LIFE 20 



CHAPTER III. THE CRITERIA OF LIFE 31 



CHAPTER IV. THE MANIFESTATIONS OF LIFE 34 



IRRITABILITY, 34. CONDUCTIVITY, 67. MOTION, 71. 



METABOLISM, 81. REPRODUCTION, 91 



CHAPTER V. THE CELL 93 



CHAPTER VI. CELL DIVISION 102 



CHAPTER VII. THE HIGHER ORGANISMS 109 



CHAPTER VIII. REPRODUCTION 181 



CHAPTER IX. ONTOGENESIS 211 



CHAPTER X. CONFORMITY TO TYPE 249 



CHAPTER XI. DIVERGENCE 282 



CHAPTER XII. STRUCTURAL RELATIONSHIP 301 



CHAPTER XIII. BLOOD RELATIONSHIP 317 



CHAPTER XIV. PARASITISM 327 



CHAPTER XV. INFECTION AND IMMUNITY 364 



CHAPTER XVI. MUTILATION AND REGENERATION 401 



CHAPTER XVII. GRAFTING 420 



CHAPTER XVIII. SENESCENCE, DECADENCE, AND DEATH 443 



CHAPTER XIX. THE CULTIVATION OF TISSUE IN VITRO . . . 456 



15 



