Berry, Imitation in Cats. 15 



I had rolled it into the hole. The second day she struck at it 

 several times as it was rolling toward the hole. There seemed to 

 be no method in her attempts, for several times she knocked the 

 ball away from the hole when otherwise it would have gone in. 

 On January 31 for the first time she struck the ball when it was 

 not in motion. From this time on it was an easy matter to get 

 her to strike it by tapping on the floor beside it. When she was 

 left alone occasionally she smelled of the ball, but she spent most 

 of her time watching me and washing herself. It was not until 

 the last two days of the experiment that she dehberately rolled 

 the ball into the hole. 



Experiment 7. Learning to Catch Mice. 



Method. — A cage 112 cm. long, 83 cm. wide, and 190 cm. high 

 was inclosed on three sides with wire netting. A mouse put into 

 this cage could neither escape nor conceal itself. 



Results. — January 2. A large black mouse was placed in the 

 cage with Z. At first Z very cautiously smelled of it. Then when 

 the mouse ran she ran after it, striking it with her paw. Although 

 she became rougher in her play during the last half hour, she did 

 not once growl or strike the mouse with her claws. At the end of 

 one hour the mouse was taken out of the cage uninjured. 



January 3. Y was put into the cage with the same mouse for 

 one hour. When the mouse ran he ran after it, but at first he 

 did not touch it. After a few minutes, however, he began to 

 strike it. When it climbed up the side of the cage he sat and 

 watched it until it came down again. Unlike Z, he used his claws 

 and switched his tail. During the last few minutes of the hour 

 he did not seem to be much interested in his companion. 



January 4. X was put into the cage with the same mouse for 

 one hour. At first, like the other cats, she merely smelled of the 

 mouse and followed it about the cage, but soon she began to strike 

 it with her paws. A few times she seized it in her mouth. As far 

 as I could see she never used her claws. She played with it much 

 as she played with the tennis ball in Experiment 6. Her interest 

 abated somewhat during the latter part of the hour. The mouse 

 when taken out of the cage apparently was uninjured, and began 

 to wash itself. However, two days later it was found dead in its 

 cage, possibly from injuries received in the experiment. 



