CONTENTS. 



BOOK I. 



THE FRONTIERS OF SCIENCE. GENERAL THEORIES OF 

 LIFE AND DEATH. THEIR SUCCESSIVE TRANS- 

 FORMATIONS, 



CHAP. fAGE 



I. EARLY THEORIES i 



II. ANIMISM- 5 



III. VITALISM 15 



IV. THE MONISTIC THEORY 34 



V. THE EMANCIPATION OF SCIENTIFIC RESEARCH FROM 



THE YOKE OF PHILOSOPHICAL DOCTRINE . . 42 



BOOK II. 



THE DOCTRINE OF ENERGY AND THE LIVING WORLD. 

 GENERAL IDEAS OF LIFE. ALIMENTARY LIFE. 



1. ENERGY IN GENERAL 57 



IL ENERGY ix BIOLOGY 97 



III. ALIMENTARY ENERGETICS . 116 



BOOK III. 

 THE CHARACTERS COMMON TO LIVING BEINGS. 



I. DOCTRINE OF VITAL UNITY 146 



II. MORPHOLOGICAL UNITY OF LIVING BEINGS. . . 157 



III. CHEMICAL UNITY OF LIVING BEINGS . . . . 173 



IV. TWOFOLD CONDITIONING OF VITAL PHENOMENA. 



IRRITABILITY 188 



ix. 



