The Mental Life of the Monkeys 217 



by precisely the same sort of tuition with precisely the same 

 act. 



Nor is there any evidence to show that although tuition 

 failed to cause successes where unaided effort failed, it yet 

 caused attempts which would not otherwise have occurred. 

 Out of fifteen cases where such might have appeared, there 

 were only three where it is possible to claim that they did. 

 No one of these three is a sure case. With RR (wood plug) 

 No. i did seem to pull the plug more definitely after seeing 

 me than before. With QQ (c) (nail chute) and MM (bolt 

 at top) he may possibly have done so. 



In 5 cases I tried the influence of seeing me make the 

 movement on animals who had done the act of themselves, 

 the aim being to see whether there would be a marked short- 

 ening of the time, a change in their way of operating the 

 mechanism or an attempt at such change. I will give the 

 essential facts from the general table on pages 226-229. 



(a) No. i had succeeded in pulling in the box by the upper 

 string in 000 (upper string box) in 2.20 and then failed in 

 3.00. I showed him 4 times. He failed in 10. I showed 

 him 4 more times. He failed in 10. I showed him 4 more 

 times. He succeeded in .20. No change in manner of act or 

 objects attacked, though my manner was different from his. 



(&) No. i had succeeded in QQ (a) (chute bar) in 8.00. I 

 showed him 20 times. He failed in 10. I showed him 10 

 more times. He succeeded in 2.00. I showed him 10 more 

 times. He succeeded in 50 seconds. No change in his 

 manner of performance or in the object attacked, though my 

 manner was different from his. 



(c) No. i had succeeded in 3.00, .25, .07, .25, .20, .06 and 

 .09 with QQ (b) (chute bar double) and then failed in 5.00. 

 I showed him 10 times. He then failed in 5 twice, succeeded 

 in 3.00, and failed in 5 again. No change in manner of per- 



