34 



HARRY H. WYLIE 



Figure VII 



Figure VIII 



Curves 77 (Figure VII) and 80 (Figure VIII) are individual curves from Group 

 Nine. The horizontal lines represent the percentage of correct responses. The 

 vertical lines represent the number of series of 20 trials each. The dotted lines repre- 

 sent the record for correct responses and for hesitations. In lettering, — A is the end 

 of the learning process with the light, B is the end of the simultaneous series, C is 

 the end of the learning process with the sound. 



