xii CONTENTS 



CHAPTER VI 



BEAIN AND NERVE 



PAGE 



The general scheme — The arrangement of the ganglia — The spinal 

 cord — The brain — The development of the nervous system — The 

 human brain — Connections within the central nervous system 87 



CHAPTER VII 



THE SPECIAL NERVOUS MECHANISMS 



The sensory mechanisms — The motor mechanisms — The " simple 

 reflex" mechanism — The cranio-spinal reflexes — The mechanism 

 of co-ordination — Cortical control - - - - 106 



CHAPTER VIII 



THE ANALYSIS Off BEHAVIOUR 



Stimulus and response in general — The lower brain activities — 

 Nervous inhibition — The cortex cerebri — The meaning of 

 behaviour — The nervous system as a whole - - - 130 



CHAPTER IX 



THE MECHANISTIC CONCEPTION OF LIFE 



The Cartesian mechanism — The influence of chemical and physical 



investigations — Modem mechanisms of life - - - 152 



CHAPTER X 



THE MEANING OF PERCEPTION 



The nature of sensation — Perception — The problem of free-will — In- 

 determination in acting — Memory and habit — The " categories of 

 the understanding " — Space and time - - - - 164 



CHAPTER XI 



THE NATURE OF LIFE 



The laws of thermodynamics — The condition of the universe — 

 Dysentropic phases in the universe — Digression on orders of 

 magnitude and duration — The improbability of life in the uni- 

 vsrse — The physical nature of life — Life and energy - - 192 



APPENDICES 



I. A METAPHYSICAL DISCUSSION ..... 222 



U. SPACE IN THE MODERN THEORY OF RELATIVITY - - - 235 



III. THE SUBMAXILLARY GLAND — AN INSTANCE OF ORGANIC 



FUNCTIONING - - - - _ . . 237 



INDEX ..---... 241 



