96 Heredity and Social Progress 



when discordant elements interfere with this 

 harmonious growth, renewing it in a simpler 

 form ; visualization springs from the isolation 

 of parts by disruptive elements. Start growth 

 and memory will appear. Arrest it, and emo- 

 tion arises. Struggle to reconstruct it and vis- 

 ualization begins. A disruptive discharge of 

 energy is emotion, a blocked discharge is 

 visualization, while a harmonious discharge is 

 the source of memory. A developing organ- 

 ism with plenty of surplus energy has periods 

 of growth which create the structure upon 

 which will and memory depend ; it has disrup- 

 tive epochs when some portions of this struc- 

 ture are destroyed, simplified, or isolated, and 

 epochs of regeneration when growth in new 

 forms builds new structure which conforms to 

 new needs. 



Emotion and visualization are the result of 

 these periods of transition. If structure be- 

 comes hardened so that it does not change, the 

 qualities disappear or are much weakened. It 

 is natural, however, that structure should be 

 displaced and new forms, bringing with them 

 new memories and actions, should appear. 



