Proportions of Stuinlanl /.' '/ mul Jilif in n Mis lure of apparently the same Tint a* 

 various Spectral Colours in four cases of Partial Colour Blindness (v. Kries). 



FIG. 5. 



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YKu-e Lengths of SptcJtnutv. 

 Reds VaJtuute for Partial' Colour BUnds fvSries). 

 The two curves A art' Denteranopes. the tvw B Protanopes. 



