404 'Journal of Comparative Neurology and Psychology. 



lift. Each time wlieu No. 6 raised the screen No. 5 went to it and looked, 

 but she did not put her hands to the screen. She saw ten times. 



When No. 6 went away No. 5 usually fingered and pulled the screen, but 

 did not put her palm against it and push. 



When No. 6 was out No. 5 lost interest in the screen and sat down in the 

 corner of the cage. 



Tenth test. No. 5 went to the screen on first entering the cage and worked 

 at the lower edge of it and at the frame. No. G came and lifted the screen. 

 No. 5 saw plainly and when No. 6 dropped some seeds No. 5 got them. This 

 was repeated a number of times. No. 5 frequently went to the screen and 

 worke([ while No. 6 was eating, but she never lifted it. She either grabbed 

 the to]( and shook It or fingered the crack at the lower edge. She saw fifteen 

 times in all. 



W^hen No. G was out No. 5 became indifferent to the screen and continued 

 so during the entire ten minutes. 



Eleventh test. No. 5 was near No. G; she saw twenty times in thirty 

 performances and often got the food which No. 6 dropped. After each per- 

 formance No. 5 put her hands on the screen. She usually shook the top. A 

 number of times when No. 6 was opening the screen No. 5 stood upright on her 

 feel, witli hands hanging loose and her nose close to the screen. She did 

 not, however, put her hands on the screen while No. 6 was lifting it. 



When No. 6 was out No. manifested no more interest in the screen. 



Twelfth test. No. 5 was attentive to No. 6 most of the time and saw 

 at least fifteen times in twentj--six. After the third time No. 5 went to the 

 screen and pushed on the frame with her palms ; almost every time after- 

 wards she went to the place when she saw No. 6 push the screen up. After 

 the fifteenth time she went to the screen, placed her palms against it and 

 looked all about the lower edge and pulled at the upper part. Once she 

 got food when No. 6 pushed up the screen. 



With No. 6 out No. 5 went to the screen and looked at it, but made no 

 effort to get food. She remained quiet in the cage, and after eight minutes 

 went to the screen and examined it with eyes and fingers. 



Thirteenth test. No. 5 saw five of ten performances. When No. 6 had 

 been taken out she made no effort to lift the screen. 



Summary of Beliavior of yo. 5 in the Screen Experiment. 

 No. 5 had seen the screen lifted in the Paper Experiment and had gotten 

 food by tearing the paper. During her preliminary trials in the Screen 

 Experiment she manifested an interest in the screen, but this interest seeme<l 

 to fade in the later trials. During the imitation tests, when she was 

 observing No. 4, this interest Increased and again died away. No. 6 was 

 substituted for No. 4 and the interest of No. 5 again revived, reaching its 

 highest point during these tests. In the sixth test she seemed nearest to 

 repeating the act she liad seen, when, after seeing No. 6 lift the screen five 

 times, she went to the screen and In a manner similar to his put her bands 

 against it and pushed. In the later tests, after failing in all her efforts at ihe 



