Contents 



CHAP. PAGE 



PREFACE ......... vii 



1. INTRODUCTORY ........ 1 



2. GENERAL ADAPTATION 18 



3. GENESIS OP THE NERVOUS SYSTEM . . . . 31 



4. PHYLOGENY AND ONTOGENY OF THE NEURONA . . 41 



5. OTHER RHYTHMS OF THE ORGANISATION . . . 69 



6. PSYCHIC ADAPTATION 84 



7. HEALTH AND THE GENERAL LAWS OF MECHANICS . . 120 



8. NATURAL SELECTION ARTIFICIAL SELECTION PSYCHIC 



SELECTION 147 



I. NATURAL SELECTION AND THE STRUGGLE FOR 



LIFE 147 



II. ARTIFICIAL SELECTION 164 



III. PSYCHIC SELECTION 168 



9. THE CONFLICT OF CLASSES AND CONCEPTIONS OF 



EQUALITY 171 



10. HEREDITY ... 182 



11. MEDIUM 219 



xix 



