36 THOMAS WILLIAM BROCKBANK 



TABLE VI-A 



1 Trial per Day 



30-Day Period, During Which A New Problem Was Learned 



" Errors " At Turns 



Last 25 Trials of Learning; Complete Redintegration 



*3 Omitted, due to incomplete records of " errors " in learning. 



of trials, nor in average number of perfect trials, nor in 

 speed of movement. On the contrary, it seems from the 

 results that the rats have been benefited in retention by 

 the learning of the new problem during the retention 

 period. A summary of these conclusions is presented in 

 Plate III, the curves of which are constructed from the 

 data in the four tables of the two groups under considera- 

 tion. The norm group, according to these curves, is inferior 

 to the group which learned a new problem during the 

 retention period. 



In considering the results of the present experiment 

 where a new problem was learned during the retention 

 period, there is on the one hand the fact that at the be- 



