The Mental Life of the Monkeys 183 



that night, but in the morning the box was open. His 

 times thenceforth were 20, 10, 16, 25 and on January iQth, 

 40, 5, 12, 8, 5, 5, 5 seconds. 



I then tried him (January 21, 1900) in CCC ( double bar). 

 He did it at first by pushing the old bar and then pulling 

 at the door until he worked the second bar gradually 

 around. Later he at times pushed the second bar. The 

 times taken are shown in the time-curve. I then (Janu- 

 ary 25th) tried him in NN (hook). See time-curves on 

 page 185. I then (January 2yth) tried him in NNN (hook 

 on other side). He opened it in 6, 12 and 4 seconds in the 

 first three trials. I then (20 minutes later) tried him with 

 NNNN (double hook). He opened the door in 12, 10, 6 

 and 6 seconds. I then (January 2yth) tried him with PP 

 (string across). He failed in 10. I then (February 2ist) 

 tried him with apparatus OO (string box). For his progress 

 as shown by the times taken see the time-curve. His 

 progress is also shown in the decrease of the useless pullings 

 at the wrong string. There were none in the gth trial, 

 I4th, 1 5th, 1 6th, 1 8th, 24th, and following trials. 



No. i was then (February 24th) tried with OOO (string 

 box with box on upper string). No. i succeeded in 2.20, 

 then failed in 10.00. The rest of the experiment will be 

 described under imitation. 



He was next tried (March 24th) with apparatus QQ 

 (chute). He failed in 10.00, though he played with the ap- 

 paratus much of the time. Other experiments were with 

 box RR (wood-plug) (April 5th). He failed in 10.00. 

 After he had, in a manner to be described later, come to 

 succeed with RR, he was tried in box SS (triple ; wood-plug, 

 hook and bar) (April i8th) ; see time-curve. No more 

 experiments of this nature were tried until October, 1900. 



The rest of the experiments with No. i and all those with 



