362 THEORETICAL BIOLOGY 



implements and living organisms, are wholly and solely built 

 up, and in accordance with enduring laws. 



And so the theory of biology must always proceed from 

 these elements of intuition, if it would seek to bring the 

 phenomena of life into a comprehensive association. 



The present book contains the first attempt of the kind. 

 How far it has been successful, my readers can decide for 

 themselves. 



rP.INTED IN GREAT BRITAIN BY 

 The EDINBURGH TRESS, 9 AND II YOUNG STREET, EDINBURGH 



