112 



HAROLD C. BINGHAM 



TABLE 10 

 Relative Values of Visual Factors 



perfect reactions to the condition o 28+ — o 12+, I tested, with- 

 out further training, their reactions to two different circles the 

 sizes of which bore the same relation to each other as that of 

 the former pair. This test was made for two different pairs of 

 circles to determine whether or not a chick trained to choose the 

 larger of two stimuli will choose the larger of two other stimuli 

 that are larger or smaller than, but have the same proportion 

 in size as those with which it was originally trained. 



The diameters of the circles used in o 28+ — o 12+ discrim- 

 ination are respectively 6 cm. and 4 cm. The variable, there- 

 fore, is two-thirds of the standard. After the chick had reacted 

 perfectly to the 6-4 circles, they were replaced with two circles 

 having diameters respectively of 4 cm. and 3 cm., i.e., having 

 the same difference ratio. In the next place they were replaced 

 with two 9-6 circles in which case the difference ratio again 

 remained unchanged. All of the subjects, except No. 3, men- 

 tioned in the foregoing discussion, were tested in this manner. 



