C)6 E. L. THORNDIKE. 



curves showing the animal's proficiency after an interval w^ith- 

 out experience. To these data may be added the following : 

 The three chicks that had learned to escape through the long 

 labyrinth (involving twenty-three associations) succeeded in 

 repeating the performance after ten days' interval. Similarly 

 the chicks used as imitators in V, W, X and Y, did not fail to 

 perform the proper act after an interval of twenty da3'S. Cat 6, 

 who had had about a hundred experiences in C (Button)^ had 

 the association as perfect after twenty days as when it left off. 

 Cat 2, who had had '^6 experiences with C and had attained a 

 constant time of 8 sec, escaped fourteen days later in 3, 9 and 

 8 sees, respectively, in three trials. Cat i, after an interval of 

 twenty days, failed in 10 minutes to escape from C. The signal 

 for climbing up the front of the cage was reacted to by No. 3 

 after an interval of twenty-four days. No. 10, who had learned 

 to discriminate between ' I must feed those cats ' and ' I will not 

 feed them,' was tried after eighty days. It was given 50 trials 

 with the second signal mingled indiscriminately with 25 trials 

 with the first. I give the full record of these, ' yes ' equalling a 

 trial in which she ' forgot' and climbed up, ' no ' equalling a trial 

 in which she wisely stayed down. Dashes represent interven- 

 ing trials with the first signal, to which she ahuays reacted. It 

 will be observed that 50 trials put the cat in the same position 

 that 350 had done in her first experience, although in that first 

 experience she had had only about a hundred trials after the 

 association had been perfected. The association between the 

 first signal and climbing up was perfect after the eighty days. 



Trials 1-7. Trials 8-17. Trials iS-27. Trials 28-35. Trials 36-42. Trials 43-50. 



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