42 



HARRY H. WYLIE 



varied from trial to trial. However, later to make the 

 conditions more nearly uniform with the training given 

 with other sorts of stimuli, the stimulus, when once given, 

 was continued until the animal turned back. The follow- 

 ing tables summarize the results: 



Average. 



162 



10.8 



Average. . 

 Average for 31 animals, 191.13 trials, 12.74 series. 



215 



14.3 



A number of illustrative curves are given below. These 

 curves show the record of these animals not only while 

 learning the response to the pain stimulus, but also when 

 transferred to the other sorts of stimuli. They will be 

 referred to later also when discussing transfer from pain 

 to Hght and sound. See Figures XVIII to XXI inclusive. 



Here again practically all curves show a period of no pro- 

 gress at the beginning, then a rapid rise to perfection and 

 no long process of perfecting. 



