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. 1 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. 1 had succeeded in pulling in the box by the upper 
string in OOO (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. Hesucceededin.20. No change in manner of act or 
objects attacked, though my manner was different from his. 
(b) No. 1 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. 1 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 ro times. He then failed in 5 twice, succeeded 
in 3.00, and failed in 5 again. No change in manner of per- 
