6o 



E. L. THORNDIKE. 



back of box BBi was torn off and wire netting substituted for it. 

 Another box with open front was placed directly behind and 

 against box BBi. No. 3, who was put in this second box, could 

 thus see whatever took place in and in front of box BBi (o at 

 back, high). The record follows : 



A similar failure to imitate was observed in the case of 

 another simple act. No. i, as may be seen on page 33, had 

 learned to escape from a pen about 8 by 5 feet by jumping 

 up and biting a cord which ran from one end of the pen to 

 the other and at the front end was tied to the bolt which 

 held the door. Dogs 2 and 3 had failed in their accidental 

 jumping and pawing to hit this cord, and were then given a 

 chance to learn by seeing i do so, escape, and of course be fed. 

 I always jumped in the same way, biting the cord at the same 

 place, namely where a loose end from a knot in it hung down 4 

 or 5 inches. 2 and 3 would either be tied up in the pen or left 

 in a pen at one side. They had a perfect chance to see i per- 

 form his successful act. After every twenty or thirty perform- 

 ances by I, 2 and 3 would be put in alone. It should be 

 remembered that here, as also in the previous experiment and 

 all others, the imitators certainly zuanted to get out when thus 

 left in alone. They struggled and jumped and pawed and bit, 

 but they never jumped at the cord. Their records follow. 



