296 ADA W. YERKES 



14. The inbred rats had a larger proportion of water in the 

 brain and cord than did the stock rats. 



15. The inbred rats showed an ability to form the same habits 

 as the stock rats but they did it slowly and with greater irreg- 

 ularities from day to day. 



16. This slowness seems chiefly to have been due to a greater 

 timidity and a greater susceptibility to environmental condi- 

 tions. 



