The Sense of Sight: Color Vision 147 



could not discriminate visually. It was to avoid unsafe conclu- 

 sions and unfair comparisons, as the result of such misleading 

 series, that three perfect series in succession were required 

 as evidence of a perfectly formed habit of discrimination. 



TABLE 20 

 GREEN-LIGHT BLUE TESTS 



Twenty series, 200 tests for each of the individuals in the 

 experiment, yielded no evidence whatever of the dancer's 

 ability to tell green from blue. As it has already been proved 

 that they readily learn to choose the right box under dis- 

 criminable conditions, it seems reasonable to conclude either 



