[tdrnbullI 



r 



A SUBJECTIVE PHENOMENON OF VISION. 



Trans. R. S. C, Sec. III., 1900 



Fis- I 



R fZed X 



I 8 Indifjo 



PI^TE IV 



Oran.ii- 

 Cirt p N Narni.il 



' ' O' '- GB C/w,.,s/i L 



ieconds from t.me of "f.xm^- 



n 





10 15 



PLATE V 



; Wave lengths of light 



■400 W^ 500 600 



