1 82 Animal Intelligence 



way that it could be easily reached by the monkey's arm 

 through the wire netting. 



QQ (a) was of the same general plan. By turning a 

 handle through 270 food could be obtained. 



QQ (b) was like QQ (a) except that i\ full revolutions 

 of the handle in one direction were necessary to cause the 

 food to drop down. 



QQ ( c ) was a chute apparatus so arranged as to work when 

 a nail was pulled out of a hole. 



QQ (d) was arranged to work at a sharp pull upon a brass 

 ring hanging to it. 



QQ ( e ) was arranged to work when a hook was unhooked. 



QQ (0 was arranged to work when a loop at the end of a 

 string was pulled off from a nail. 



QQ (ff) was QQ (f) with a stiff wire loop instead of a loop 

 of string. 



EXPERIMENTS ON THE ABILITIES OF THE MONKEYS 

 TO LEARN WITHOUT TUITION 



I will describe a few of the experiments with No. i as 

 samples and then present the rest in the form of a table. 

 No. i was tried first in BB (0 at back) on January 17, 1900, 

 being put inside. He opened the box by pulling up the 

 string just above the bolt. His times were .05, 1.38, 6.00, 

 i.oo, .10, .05, .05. He was not easily handled at this time, 

 so I changed the experiment to the form adopted in future 

 experiments. I put the food inside and left the animal to 

 open the door from the outside. He pulled the string up 

 within 10 seconds each time out of 10 trials. 



I then tried him in MM (bolt). He failed in 15. I then 

 (January i8th) tried him in CC (single bar outside.) He 

 got in in 36.00 minutes ; he did not succeed a second time 



