228 MIND IN EVOLUTION CHAP. 



Next day. 



1. Wrong first. Then quickly round, and pulls right. 



2. Right at once. 



3. Same. 



4. Same. 



This really resolved itself into a discrimination 

 experiment, in which Jack learnt the right part of the 

 string by my pointing to it twice in one trial, 1 after 

 which he never altogether failed, though he once tem- 

 porarily forgot. 2 



Teufel also did an experiment of this kind, in which 

 the right part of the string was at first distinguished by some 

 wool. The right string was pointed at the first time and 

 once later. The whole record is as follows. 



RECORD IN BRIEF. 



(Right or wrong at first trial.) 



First night. Second night. Third night. 



1. Right (pointed to). Right. Wrong. 



2. Wrong. Right. Right.^ 



3. Wrong. Right. Right. 



4. Right. Right. Right. 



5. Wrong. Wrong. Right. 



6. Right. Right. 



7. Wrong. 



8. Right (pointed). 



9. Right. 



10. Right. 



11. Right. 



12. Right. 



Finally, I arranged a similar experiment for the elephant, 

 with similar results. 



1 His success in No. 3 may have helped him, but it would probably be 

 neutralised by my leaving the string slack again in No. 4. 



2 This was a particularly instructive case of temporary failure. I did 

 not give him the slightest hint or reminder, but after he had waited 

 stupidly for a long time, I told him to go on, in the reproachful tone 

 which one might use to a person who really knows a thing, but is 

 suffering from some inhibition which prevents his using it. In Jack's 

 case my remark seemed precisely to have this effect of removing the 

 inhibition, or perhaps of supplying the needed stimulus to set the 

 machinery to work. 



