FUNCTION OF VIBRISSAE IN BEHAVIOR OF WHITE RAT 23 



excessive, the rate of running is one-third that of the Hampton 

 Court maze, and although this is a more simple maze, the errors 

 approximate those made in the other. The irregularity of the 

 error curve must also be explained. 



We are not quite ready to say that these differences were due 

 to the lack of vibrissae yet this was the only difference known 

 between these two groups save that perhaps this group was 

 tamer. 



Fig. 4 — Fourth trial of " Baby " — vibrissae cut on the right side. 



We next used two sets of rats with the vibrissae cut upon 

 one side only to see if possibly differences in behavior might not 

 be revealed in this way. 



Experiments IV. and V. Rats with vibrissae cut upon one side 

 only. These experiments were tried with two sets of rats at two 

 different times but the behavior will be discussed as a whole. In 

 the first set the vibrissae were cut upon the right side as it was 

 believed that more errors were made upon that side and there- 

 fore the loss on that side would be more severely felt. The 

 results were strangely at variance with what we had expected 



