The Sense of Sight: Brightness Vision 105 



The preference tests, which of course would be valueless as 

 such unless they preceded the training tests, were given as 

 preliminary experiments, in order that the experimenter 

 might know how to plan his discrimination tests, and how 

 to interpret his results. 



The results given in the white-black preference tests by 

 ten males and ten females are presented in Table 8. Three 

 facts which bear upon the brightness discrimination tests ap- 

 pear from this table: (i) black is preferred by both males 

 and females, (2) this preference is more marked in the first 

 series of tests than in the second, and (3) it is slightly stronger 

 for the first series in the case of females than in the case of 

 males. 



That the dancers should prefer to enter the dark rather 

 than the light box is not surprising in view of the fact that 

 the nests in which they were kept were ordinarily rather 



TABLE 8 

 WHITE-BLACK PREFERENCE TESTS 



