Haggerty, Imitation in Monkeys. 345 



]S^o. 1 died suddenly, from no obvious cause, at the close of the 

 first experiment. JS^o. 2 was taken to New York in June, 1908. 

 He remained in good health throughout the entire investigation. 



ISTo. 3, Cebus hypoleucus, male, was a small animal apparently 

 less than two years of age. He was shipped with a mate from New 

 York City to the Harvard Laboratory in March, 1908. He had 

 not long been off the ship which brought him to New York and 

 was in poor physical condition. He never became vigorous, but 

 his good appetite kept him hunting for food. He was one of the 

 animals taken to the Park in June and was used in a number of 

 tests. 



No. 4, Cebus fatuellus, female, was a large fine animal. She 

 was full grown, probably six years of age and had been in the 

 Zoological Park half of that time. She was kept, with Nos. 5, 6, 

 8, and 9, in a large cage which contained a number of Cebus and 

 Spider monkeys and several lemurs. She was the boss of the cage, 

 and was very aggressive toward the other animals, especially when 

 food was put into the cage. She was physically the strongest Cebus 

 monkey I have studied, but when she did not readily solve a mechan- 

 ism she gave up trying sooner than did No. 5. She was always 

 attentive to any movements of the experimenter or of another 

 monkey in the cage. She was not afraid, but would not allow 

 herself to be handled. 



No. 5, Cebus capucinus, female, was the most active animal I used. 

 She was scarcely ever quiet in the experiment cage except when 

 she crouched in fear. She was almost as strong as No. 4 but had 

 less inclination to fight and to take food from other animals. How- 

 ever, no animal in the large cage excepting No. 4 dared to take 

 food from her. When any new device was exposed in the experi- 

 ment cage, No. 5 examined every part of it with great rapidity 

 and her interest did not abate if she did not solve the problem 

 at once. She returned repeatedly to every new part in the cage 

 and worked at it persistently, using all her ingenuity and strength 

 to get food or to tear the mechanism to pieces. She was five years 

 of age and had been several years in the Park. 



No. 6, Cebus lunatus, male, was thoroughly at home with per- 



