18 



STELLA BURNHAM VINCENT 



results of the experimentation are shown in the summary and 

 graph which follows. (See fig. i.) 



Summary of the results of Experiment L 



Average number of errors in the first twenty-five trials . 



Average number of errors in the first trial 



Average number of trials in learning 



Average time of the last ten trials in learning 1 1 



Average time of the last of these ten trials 8.5 " 



Slips and falls none 



41. 

 18. 



16.5 

 sec. 



Fig. 1 — Learning curves, time and error, of normal rats — maze with sides up. 



Experiment II. Rats with vibrissae; maze without sides. Two 

 sets of rats were used upon the maze with sides down, four 

 females in June and five males in September 191 1. The two 

 groups gave very similar results although the males were a little 

 quicker in learning. In computing the errors an entrance into 

 a cul de sac is counted as one, a return, no matter how far, as 

 one, but a return with an entrance into a cul de sac, as two. 



