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CONTENTS 



xxvii 



SECTION VI 



PAOE 



MENTAL FACULTIES AS ACQUIRED AND INHERITED CHARACTERS 221 



The Function of the Brain .... 



Reflex Action ..... 



Intelligence, Reason, Habit (Automatic Actions), Instinct 



Particular Instances of Intelligence and Reason in Animals 



Experiments and Observations on Instinct in newly-hatched 

 Chickens ..... 



The Instinct of the Cuckoo in Laying her Eggs in other Birds' 

 Nests ...... 



Reasoning Instincts ..... 



Further Remarks on Reasoning Instincts and Intelligent In 

 stincts in Animals .... 



Reflex Action and Instinct .... 



Impulse and Instinct .... 



Concluding Remarks on Instinct 



Irritability and Sensation — Will 



221 

 222 

 223 

 231 



245 



256 

 266 



278 

 294 

 301 

 304 

 306 



SECTION VII 



ORGANIC GROWTH : THE MORPHOLOGICAL AND PHYSIOLOGICAL EVOLU- 

 TION OF THE LIVING WORLD AS THE RESULT OF FUNCTION 315 



The Origin of Organisation in Unicellular Animals — The 



Fundamental Biological Law 

 The Evolution of Organisation in Multicellular Animals 

 Origin of Muscles ..... 

 Origin of Striation in Muscles 



Evolution of the various Sense-Cells from a Common Cell 

 Layer ...... 



The Origin of the Central Nervous System 



Vicarious Nerve-Centres .... 



The Cell-Nucleus as a Central Nervous Organ 



315 

 323 



326 



328 



331 

 339 

 343 

 349 



