Berry, I?nttation in White Rats. 



339 



In following No. i out No. 2 crowded through the swinging 

 door While it was held partly open by the body of No. i. 



Date 



Nov. 8 



Nov. q 



No. I No. 2 follows No. 2 



gets out No. 2 sees No. I out gets out 



8 8 2(5,8) I 



Totals 



NO. 6 IMITATING NO. i. 



No. 6 was first put in the cage alone for ten minutes. He did 

 not get out. 



Nov. u 



Totals 



24 



Each time that No. 6 followed No. i out he squeezed through 

 the door as it was held partly open by the body of No. i. 



NO. 7 IMITATING NO. 6. 



No. 7 

 gets out 



Totals 



29 



25 



16 



Each time No. 7 followed No. 6 out he got through before the 

 door fell; at first he did not follow No. 6 closely but after No. 6 

 got out a few times he followed him all about the cage. He soon 

 discovered the location of the door so that he went to it when put 

 back into the cage by himself; yet he did not learn to push it open 



