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, 90. 



CHAPTER V. THE CELL 92 



CHAPTER VI. CELL DIVISION . 101 



CHAPTER VII. THE HIGHER ORGANISMS 107 



CHAPTER VIII. REPRODUCTION 167 



CHAPTER IX. ONTOGENESIS 193 



-JJOHAPTER X. CONFORMITY TO TYPE 223 



CHAPTER XI. DIVERGENCE 255 



CHAPTER XII. STRUCTURAL RELATIONSHIP 273 



CHAPTER XIII. BLOOD RELATIONSHIP 289 



CHAPTER XIV. PARASITISM 297 



CHAPTER XV. INFECTION AND IMMUNITY 334 



CHAPTER XVI. MUTILATION AND REGENERATION 371 



CHAPTER XVII. GRAFTING 390 



CHAPTER XVIII. SENESCENCE, DECADENCE, AND DEATH . .413 



15 



