24 



STELLA BURNHAM VINCENT 



but were confirmed by cutting the vibrissae on the left side of 

 four rats. 



These animals 'were all males with the exception of i and 2. 

 Seven of them about two months old were sent out by a dealer 

 in the city. They were as unpromising material as one often 

 sees, dirty, with sore ears, bitten and bloody where they had 

 fought in the box, wild and savage. Later three other animals 

 w^ere bought and added to this same group. These were named 

 " Baby," " Footless," and " Bobtail." Baby was a young rat 



Fig. .5— Second trial of rat " 6 " — vibrissae cut on the left side. 



about the age of the former lot but the other two were fully a 

 year old. Footless had lost his left front leg and hobbled along 

 on three, while Bobtail as his name implies had lost his tail close 

 up to his body. 



Behavior : — These rats were much less timid than the other rats 

 whose vibrissae had been cut but their behavior as a whole was 

 very like that of the rats previously tried, except that from the 

 first they kept close to edge of the walk, to the left when the 

 vibrissae were cut upon the right and to the right when they 

 were cut upon the left. As they ran out on the maze they one 



