44 



HARRY H. WYLIE 



Figure XX 



Figure XXI 



Curve 157 (Figure XX) is an individual curve from Group Twenty-three Curve 

 141 (Figure XXI) is an individual curve from Group Twenty-five. Horizontal lines 

 represent the percentage of correct responses. Vertical lines represent the number 

 of series of twenty trials each. In lettering, — A is the end of the learning process 

 with the pain, B is the end of the simultaneous series, C is the end of the learning 

 process with the sound. 



