CONTENTS. 



PAQB 



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 93 



CHAPTER VI. CELL DIVISION 102 



CHAPTER VII. THE HIGHER ORGANISMS 109 



CHAPTER VIII. REPRODUCTION 169 



CHAPTER IX. ONTOGENESIS 199 



CHAPTER X. CONFORMITY TO TYPE 237 



CHAPTER XI. DIVERGENCE 270 



CHAPTER XII. STRUCTURAL RELATIONSHIP 289 



CHAPTER XIII. BLOOD RELATIONSHIP 305 



CHAPTER XIV. PARASITISM 313 



CHAPTER XV. INFECTION AND IMMUNITY 350 



CHAPTER XVI. MUTILATION AND REGENERATION 387 



CHAPTER XVII. GRAFTING 406 



CHAPTER XVIII. SENESCENCE, DECADENCE, AND DEATH . . 429 



15 



