The Sense of Sight : Color Vision 173 



for these colors represent the extremes of the visible spectrum, 

 and might therefore be discriminable, even though those 

 which are nearer together in the spectral series were not. 



As is shown by the results in Table 28, no combination of 

 brightnesses rendered correct choice impossible in the case 



TABLE 28 

 BLUE-RED TESTS 



Brightness tests were now made, without the use of colors, 

 na 10 4655 



