128 Heredity and Social Progress 



eases are not a cause of decay, but a false growth which an 

 explosive emotion may disrupt. The organism through devo- 

 lution is cut back until only a sound core remains, and then 

 new growth in normal directions restores health. 



6. Ideas act through structure, and this must be altered 

 to permit a change in the current of thought. A devolution 

 of structure breaks one current, and a new growth arouses 

 another. Regeneration is not a mere mental state; it 

 involves a physical change. 



