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 roth, 
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 27th) 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 27th) tried him with PP 
(string across). He failed in 10. I then (February 21st) 
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, 
14th, 15th, 16th, 18th, 24th, and following trials. 
No. 1 was then (February 24th) tried with OOO (string 
box with box on upper string). No. 1 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 sth). 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 18th); see time-curve. No more 
experiments of this nature were tried until October, 1900. 
The rest of the experiments with No. 1 and all those with 
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