PERSEVERANCE REACTIONS IN PRIMATES AND RODENTS 65 



trials " is self-explanatory- to readers who have followed fore- 

 going discussions of the factors of recency and frequency in 

 these studies. 



REFERENCES 



1. Hamilton, G. \'. A study of trial and error reactions in mammals. Journal of 



1911. Animal Behavior, 1, 33-66. 



2. Holt, E. B. The Freudian Wish. vii. New York. 



1915. 



3. Yerkes, R. M. The study of human behavior. Contributions from the (Bos- 



1913. ton) Psychopathic Hospital, 9-10. 



4. Yerkes, R. M. The mental life of monkeys and apes, etc. Behavior Mono- 



1916. graphs, 3, 1. 



5. Watson, J. B. Behavior. 62. New York. 



1914. 



6. Watson, J. B. Same, 257. 



7. Watson, J. B. Same, 262. 



