360 ROBERT M. YERKES 



TABLE 8 



Results of Experiments After Complete Regeneration and One Month 

 Without Trials in T 



Operation, April 30; Last Trial, June 7 



Apparently the habit had degenerated. This may be attributed 

 to (a) period of inactivity; (b) regeneration of ganglia and 

 resumption of normal functioning bringing in new modes of 

 reaction; or (c) a combination of these factors. 



To the writer it seems probable that the interval of rest wit- 

 nessed the birth of a new worm thru the regeneration of the 

 nervous system. The habitual reaction which the "brainless" 

 individual had exhibited now gave place to new modes of be- 

 havior initiated by the new "brain" cells. 



