CHAP. XIV.] LIFE AND MIND. 97 



source of disfAirbance, we perceive a nascent form of the life 

 classed as psychical. That is to say, whenever the corre- 

 spondence exhibits some extension in space or in time, some 

 increase of speciality or complexity, we find we have crossed 

 the boundary between physical life and psychical life." * 



* Spencer, Principles of Fsycliology, roL i. p. 392^ 



