xii ARTICULATE IDEAS 281 



fastened it again so that the string was slack. He then quickly 

 pulled the hook off. His record for the rest of the day is as 

 follows : 



12. I re-fasten tight. He tries bolt, works to and fro, and 

 leaves it more forward, so that string is slacker. Then at hook. 

 Gets it off and opens. 



13. Slightly at bolt ; then at hook. String works slack, and 

 he opens. 



14. String too tight for movement of bolt to let it slacken. 

 He tries hook hard, finally gets bodily on to string, so as to pull 

 box in towards fastening and make string slack. Then gets 

 hook off, and opens. 



15. After trying hook, pulls string down hard at once. Tries 

 bolt slightly, which nearly goes back. Then takes off hook. 

 Then opens. 



1 6. Same. Tries hook well. Then bodily on to string. 

 Pulls in. Then gets hook off, and opens. 



The next day he was indifferent, and I did not try him again 

 till ten days after, when I tied back the catch of the other box 

 in a similar manner, fastening the hook first to a chain. He ap- 

 peared at first to have forgotten this experiment, and began by 

 biting through the string ; and when I replaced the string by 

 wire, he pushed the box about until he got it into a position 

 where it could be opened. I then fastened the hook on to the 

 box itself again. He watched me doing this, and attacked the 

 hook at once, but it was too tight for him. I then gave him six 

 more trials with the hook on the chain, each time taking it off as far 

 as possible without letting him see me do so. 1 It was not, however, 

 till the sixth trial that he made any attempt at the hook. 2 So I 

 took the hook off, and put it on to the fender. After this he 

 succeeded at once, and repeated his old performance of jumping 

 on the string, or giving it a vigorous pull if it was too tight for 

 the hook to come off. 



Taking this experiment as a whole, three things are 

 noteworthy. 



(i) First, the monkey showed no systematic endeavour 

 to trace out the nature of the obstacle to his 

 pulling the bolt. He did not follow the string round, and 

 get the hook off, but 



1 He may have seen me at the third trial. 



2 Instead of trying the hook, he bit the string through once, and another 

 time broke it in jumping on the box, the cord by which he was held 

 catching in the string and pulling it violently. It was noteworthy that he 

 repeated this jump, which he had found successful. 



