22 STELLA BURNHAM VINCENT 



than that found in experiment two, but the last of the ten 

 reaches a low point. The tinae of learning is slightly longer than 

 those of group two and the errors are considerably increased. 

 The noticeable thing however is the great number of slips and 

 falls — five times as many as found in group two. i 



Compare the learning curve in fig. 3 with that in fig. 2 and 

 remember that these rats were absolutely tame and that no 



27 

 26 

 25 

 24 



23 



22 



Fig. 3 — Learning curves, time and error, of rats without vibrissae on maze with- 

 out sides. 



emotional factors were observed which would account for the 

 high time curve or for the irregular error curve. 



How shall we explain the dift'erencer Although the other 

 animals were perfectly gentle, these were handled every day 

 from birth and had never been out of the room where they were 

 used. No doubt some of the emotional conditions were lacking 

 in their reactions which were present in the others. This may 

 account for the few errors in the beginning. There is however, a 

 distinct type of behavior as described above, the slips and falls are 



