294 DEVELOPMENT AND PURPOSE CHAP, m 



cause or only an epi-phenomenon. The second since at 

 the utmost we do not suppose mind in living beings to be 

 the sole cause of its own growth is whether we can find 

 out anything about the causes of this growth in general. 

 Both questions concern causation, and suggest the necessity 

 of a preliminary examination of the causal concept. 



