The Inner Organs of Expression 141 



Such social and psychic results of deficits 

 massed together are the social heritage. The 

 particular forms in which they appear in one 

 generation would not reappear in the next if 

 there were not some contact between the two 

 generations and some discipline by which the 

 ideas of fathers are impressed on sons. Few 

 persons who follow biologic discussion will 

 deny that traditions, morality, and other recog- 

 nized social phenomena are acquired char- 

 acters which lack natural means of expression. 

 It does, however, seem that mental associa- 

 tions are natural characters. 



To determine this point we must return to 

 the elementary facts. Growth, I have often 

 affirmed, is double. There is an inner neural 

 body that parallels the outer body in its 

 development, and between the two there is 

 an interchange of effects, so that the devolu- 

 tions and evolutions in the one effect similar 

 changes in the other. There is a difference, 

 however. The inner body, from its protected 

 position, is less affected by evolutional and 

 devolutional forces than is the outer body. A 

 useless outer organ would be a serious detri- 



