16 



JOHN LINCK ULRICH 



As in the latch-box problem, the rats were divided into groups 

 which were given one, three and five trials. With few excep- 

 tions, the same procedure was adopted with this experiment 

 as with the latch-box problem, but no preliminary training was 

 undertaken. Instead of exercising the rats in a square maze 

 during the interval before the retention tests, the rats were 



FIG II 



MAZE 



allowed to exercise in a 3S cm. runway that had at one end a 

 food box. They were permitted the liberty of this runway 

 during feeding. Some better method could have been adopted 

 for the animals to obtain exercise if the room in which the ex- 

 perimentation was done had been a little larger. 



The norm accepted for complete learning of the maze was 

 an average of six seconds in two successive days, and in addi- 

 tion to this criterion the runs in the maze had to be relatively 



