The Sense of Sigkl : Color Vision 163 



TABLE 24 

 GREEN-RED TESTS 



Brightnesses Extremely Different for Human Eye 

 Intensities are given in candle meters (c.m.) 



Filters were now removed. An illumination of 15 c.m. was estab- 

 lished on one side and an illumination of o on the other side, in order to 

 ascertain whether the mice would choose the brighter box. This was 

 done to test the assumption that the green in the previous tests had 

 always appeared brighter to the mice than did the red, and that in 

 consequence they had chosen the brighter box instead of the green box. 



