The Journal of 



Comparative Neurology and Psychology 



Volume XIX July, 1909 Number 4 



IMITATIO^T IN MONKEYS. 



M. E. HAGGERTY. 



From the Harvard Psychological Laboratory. 



With Thirteen Figures. 

 CONTENTS. 



PAGE 



I. Introductory Statements 337 



II. Description and Care of Animals Studied 340 



III. Method of Investigation 348 



IV. Experiments and Results 355 



Y. General Summary of Results and Conclusions 433 



I. Introductory Statements. 



1. Statement of Problem. Popular opinion has generally attrib- 

 uted to monkeys the ability to learn by imitation. As will appear 

 later, experimental evidence on the matter has been of a conflicting 

 nature, but in the main it has not supported the popular belief. The 

 general problem of imitation presents itself in the form of two 

 questions: Do monkeys imitate human beings? and T)o they imitate 

 one another ? It is conceivable and, indeed, quite probable that an 

 animal which fails to copy the acts of persons, may yet imitate indi- 

 viduals of its own species. In the native state, monkeys must have 

 innumerable opportunities to imitate one another, whereas they 

 rarely, if ever, have opportunity to imitate human beings. Further- 



THE JorRNAL OF COMrAEATIVE NEUROLOGY AND PSYCHOLOGY. VOL. XIX, NO. 4. 



