94 Heredity and Social Progress 



tions are for ideals which complement the one- 

 sidedness of reality, we repeat in each such 

 picture the isolation of the sex impulse, 

 and each rising tide of idealization indicates 

 some lack of complementary unity in the 

 physical background of thought. A physical 

 break precedes the mental elation which ac- 

 companies visualization. It is simple katabolic 

 activity in a disrupted, despecialized cell, and 

 is thus an upheaval, an emotion, a want 

 of equilibrium which ceases when the physical 

 equilibrium is restored. An intense conscious- 

 ness means some physical rupture in the forces 

 that make for life and growth. Let me put 

 this in its simplest form. Bilateral growth is 

 a primary tendency of life in which action is 

 rhythmic. Isolate these parts and each tries to 

 replace the other by regeneration. There is 

 a physical impulse inherent in organic life 

 that struggles to restore any disturbed equi- 

 librium. If thought and life run parallel, this 

 physical impulse which demands and shapes 

 the physical complements of an isolated part, 

 must have a mental accompaniment that points 

 a complement to the ideas which this part can 



