CONTENTS 



CHAPTER PAGE 



PREFACE 11 



I. CHANGES IN SCIENTIFIC OPINION . 13 



II. THE DECADENCE AND REVIVAL OF 



VITALISM 23 



III. THE SCHOLASTIC POSITION . . 36 



IV. THE CELL 50 



V. CHARACTERISTICS OF LIVING MATTER 62 



VI. CHEMICAL CHARACTERS OF CELL . 75 



VII. REPRODUCTION . .... 93 



VIII. BIOGENESIS AND ABIOGENESIS . . 112 



IX. ADAPTATIONS 148 



X. REPAIRS AND REGENERATION . .163 



XI. REGENERATION AND ITS SIGNIFICANCE 180 



XII. LIVING THINGS AND MACHINES . . 192 

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