Berry, Imitation in Cats. 17 



went to the side of the cage next to M and began to mew. Appar- 

 ently she did not reahze that she had fresh meat at her disposal. 

 A mouse was now given to M, who killed and ate it while X looked 

 on. X was allowed to smell of the blood on the floor; then another 

 mouse was given to her. She played with it as usual. Apparently 

 she had not profited in the least by M's experience. 



Next Y was tested with the same mouse. He was not as rough 

 as usual in his play. I now put M in with him. She killed the 

 mouse and began to eat it. After she exposed the raw flesh I 

 gave it to Y who ate it at once. After he had finished eating it I 

 gave him another mouse, but he did not attempt to injure it. 

 Five minutes later Z and X were put in with Y. Growlmg fiercely, 

 he seized the mouse. In fifteen minutes he had killed and eaten it. 



February 20. A white mouse was put into the cage with Z. 

 As the mouse tried to bite her she picked it up and tossed it about 

 as if it were a rag ball. She did not seem to be angry in the least. 

 When X was put in with her she growled and seized the mouse, 

 but after a few minutes she let X have it. After they had played 

 with it turn about for a few minutes, Y was put in with them. 

 He killed and ate the mouse while they looked on. He was now 

 taken out and a brown mouse was put in with X and Z. X seized 

 it and killed it almost instantly. In less than five minutes she 

 had eaten it. X was now removed and a brown mouse was put 

 in with Z. She played with it but did not attempt to kill it. 



February 21. Z played more gently with the mouse than usual. 

 X was now allowed to kill and eat the mouse while Z looked on; 

 then Z was given another mouse. She played with it a little while, 

 then refused to take further notice of it. I put M, X and Y on the 

 outside of the cage but they did not arouse Z in the least. She 

 simply ignored the mouse. 



March 6. Z played very gently with a mouse, until I put X 

 in with her, then she seized it; but X soon succeeded in getting 

 it away from her. After X had almost killed it, I gave it to Z 

 again. She seized it savagely and held on to it, growling almost 

 continuously. In less than a minute the mouse was dead and Z 

 had begun to eat it. 



March 7. A big brown mouse was given to Z. She played 

 with it but did not attempt to injure it. Fifteen minutes later 

 X was allowed to kill the mouse while Z looked on. After she had 

 half eaten it I gave it to Z who soon finished it. 



