122 ROBERT M. YERKES 



being attacked. The instant the older animals began to show 

 hostility toward one another she would leap out of the way and 

 watch the disturbance with evident satisfaction. It was this 

 mode of behavior in the little animal which ultimately pro- 

 vided opportunity for the observations which I wish now to 

 report as indicative of sympathetic, possibly I may say al- 

 truistic, emotions. 



Tiny was confined with Scotty in a cage adjoining the one 

 in which Jimmie and Gertie were being kept. The cages were 

 separated by wire netting of half -inch mesh. 



One morning as I was watching the behavior of the animals 

 in the several cages, I noticed Tiny dressing with her teeth a 

 wounded finger. It had evidently been bitten by one of the 

 other animals, in all probability either by Jimmie or Gertie. 

 Tiny was trimming away the loose bits of skin very neatly and 

 cleansing the wound. After working at this task for a few 

 minutes, she quickly climbed up to the shelf near the top of 

 her cage, and by rushing to the partition wire between the 

 two cages, she lured Gertie to an attempted attack on her. 

 Gertie sprang up to the partition, placed her hands on it, with 

 the fingers projecting through the meshes, and attempted to seize 

 Tiny's fingers with her teeth. But the latter was too quick 

 for her, and withdrawing her hands, like a flash seized in her 

 teeth the middle finger of Gertie's left hand. She then bit it 

 severely and with all her might, at the same time pulling and 

 twisting violently, often placing the entire weight of her body 

 on the finger. Her sharp teeth cut to the bone, and it was 

 impossible for the larger and stronger monkey to tear away. 

 For several seconds this continued, then Gertie succeeded in 

 escaping, whereupon she at once retreated to the opposite end 

 of her shelf and proceeded to attend to her injured finger. She 

 cried, wrung her hands, and from time to time placed the finger 

 in her mouth as though in an effort to relieve the pain. By 

 this time Jimmie's attention had been attracted by the dis- 

 turbance and he rushed up to the shelf, and facing Gertie, watched 

 her intently for a few seconds. The look of puzzled concern on 

 his face was most amusing. Apparently he felt dimly that 

 something in which he should have intelligent interest was 

 going on, but was unable wholly to understand the situation. 

 After watching Gertie for a time and trying to discover what 



