A SUBJECTIVE PHENOMENON OF VISION 



Sees 

 80 



Trans. R. S. C, Sec, III., 1906. 

 1 



f'C' 



G.'-^-N 



/G 



Hb 



10 15 20 25 30 35 



- Seconds from time of fixing 

 40 45 50 55 60 



PLATE I 



X Ciirte in middle of nitjht (I) 



after 16 mias. in darkness (2) 



S ,, for Ned gjass R 



X .. .. Greefi .. . (dotted luie) G 



» ., ., Indigo .. /8 



65 70 75 80 85 90 96 100 105 



