Dr. Pole on Colour-Blindness. 



Trans. Roy. Soc. Edinr. Vol. XXXVII. 



Figure I. 



THE NORMAL SOLAR SPECTRUM. 





























E b 



F G 



Figure 2. 



THE SOLAR SPECTRUM AS IT APPEARS TO DICHROMIC VISION. 



H 



E T> 



Figure 3. 



COLOURS WHICH APPEAR ALL SIMILAR AND NEUTRAL TO DICHROMIC VISION. 



(The exact matching of these will vary with different PatientsJ. 



DONDERS'S ARRANGEMENTS OF NEWTON'S COLOUR CIRCLE, THE COMPLEMENTARY COLOURS BEING 



SUPPOSED DIAMETRICALLY OPPOSITE EACH OTHER. 

 Figure 4- Figure 5. 



NORMAL CIRCLE. DICHROMIC CIRCLE. 



The small circles indicate the approximate hues of the "Fundamental Colour Sensations" 

 as determined by Hering, Helmholtz, and Konig respectively. 



