IMAGINATION. 76 



destructive energy to spring apart. Incoming peripheral 

 currents possess this energy from the outset. Currents 

 from neighboring cortical regions might attain to it if they 

 could accumulate within the centre which we are supposed 

 to be considering. But since during waking hours every 

 centre communicates with others by association-paths, 

 no such accumulation can take place. Tlie cortical cur- 

 rents which run in run right out again, awakening the next 

 ideas; the level of tension in the cells does not rise to the 

 higher explosion-point; and the latter must be gained by a 

 sudden current from the periphery or not at all. 



