662 'Journal of Cotuparative Neurology mid Psychology. 



In the tables, we have given each gi'oup of papers the number of 

 the gray in Hering's series which was used as a brightness standard 

 in selecting the colored papers which constitute the group. There 

 are twentj-one colors which gave no flicker, when rotated with their 

 respective grays, twelve which gave a just noticeable flicker sensation, 

 and six which gave an amount of flicker just noticeably greater than 

 that of the twelve colors. In Table 1 these degTees of flicker are 

 designated by the numerals 0, 1, and 2, respectively. 



TABLE 1. 



Bbightness of Certain Milton Bradley Colored Papers as Determined by 

 Rood's Flicker Method. 



Group 2. 



{December 21, 1007.) 



Heriug's Gray Paper No. 2 = 81.5 per cent white. 



Green-blue tint 2 



Yellow-greeu tint 1 



Orange-yellow tint 1 



Orange tint 1 



Green-orange tint 1 1 



Yellow-orange tint 1 2 



Group 5. 



(June 28, 1907.) 



Hering's Gray Paper No. 5 = 44 per cent white. 



Red-violet tino 1 



Violet-blue .tint 2 



Orange-yellow shade 1 



Red-orange tint 1 1 



Violet tint 2 2 



Group 10. 



{December 25, 1007.) 



Hering's Gray Paper No. 10 = 23 per cent white. 



Blue-violet 



Green-blvie 



Orange shade 1 



Yellow-green shade 2 



Red tint 1 



Yellow-orange shade 2 1 



Blue-green shade 1 2 



Red-violet 2 



