72 



RESUME OF C0NCLU3I0:i3. 



1. Youn£- rats learn the maze more rapidly than the oil 

 ones, the rapidity with which the habit may be formed decreasi.ig 

 with increase in age. 



2. Absolute time, the time required for the execution 

 of the perfect run, increases with increase in age, the oldest 

 group requiring more than twice as much time as the youngest. 



5. The most rapid stage of habit formation occurs ear- 

 lier in the learning process of the younger animals than of the 

 older ones. 



4. In the very young rats (25 days )and the very old 

 (300 days) sex differences are negligible, while among the ani- 

 mals of medium age (65 - 200 days) the males learned more rapid- 

 ly than the females. 



5. In general, the absolute time for the females is low- 

 er than that for the males suggesting greater efficiency on the 

 part of the former in the execution of the habit v.hen it had 

 once been perfected. 



6. Practically no difference in ability to form the maze 

 habit is to be found between rats learning the problem in the 

 day time and those learning at night. 



2* Continue! practice after the problem has been learn- 

 ed causes a break in the habit and does not result in an in- 

 crease of final efficiency. 



8. The rapidity with which the maze habit will be form- 

 ed is predictable within certain limits from one family group 



