Berry, Imitation in White Rats. 349 



attention to the knot. After two more trials he began to smell 

 of the knot and tried to get hold of it with his teeth. After hav- 

 ing followed No. 2 out six or seven times, he became most active 

 in his efforts to grasp the knot when put back by himself. This 

 activity continued for several trials and then rapidly decreased. 

 This was not because he was not hungry or did not want to get 

 out, for when No. 2 was put in with him he became very active, 

 standing up beside him and running back and forth to the door. 

 Only once, however, did I see him try to get hold of the knot by 

 grasping for it with his paw\ He always used his teeth, hence his 

 failure to get out. 



NO. 6 IMITATING NO. 2. 



Time 



Jan. 15 6 4 



Jan. 16 I I 



Jan. 16 — — 



Jan. 16 4 3 



Jan. 17 8 6 



Jan. 18 7 2 



Totals 27 , 16 27 2 



The two times that No. 6 got out he succeeded in seizing^the 

 knot with his teeth without using his forepaws to pull it down. 

 When it was raised so he could not grasp it with his teeth, without 

 first using his forepaws, he did not once succeed in getting hold of 

 it. No. 2 always seized the knot with his forepaws and pulled it 

 down until he could also get hold of it with his teeth. 



Out of the twenty-seven times that No. 2 opened the door by 

 pulling the knot. No. 6 stood up beside him at the knot sixteen 

 times and tried to get hold of it eight times. Much of the time 

 that No. 2 was trying to get hold of the knot No. 6 was running 

 back and forth from him to the door. 



