346 SIR W. DE W. ABNEY : .MODIFIED APPARATUS FOR MEASUREMENT OF COLOUR 



(16.) Determination of Colour Sensations and White. 



The results given in Table III. are carried still further in Table IV. In it 

 Column L, is as before, the standard scale number. Columns II., III., IV., V. are 



TABLE IV. 



RS, GS, BS, and (white) W. These are obtained from Columns XIII., XVI., and 

 XVII. of Table III. From SSN (standard scale number) 64 to 49 no white is present 



