44 On the Vision of Colours. 
Now, the red being most copiously reflected, the 
colour will be recognized by a common eye un- 
der this smal! modification; but the red not appear- 
_ ing to us, we see chiefly the orange excess: it is 
consequently to us not a modification but a new 
colour. 
3. By a similar method of reasoning, crzmson, 
being compounded of red and dark blue, must as- 
sume the appearances I have described. 
4. Bodies that are red and scarlet probably re- 
flect orange and yellow in greatest plenty, next af- 
ter red. The orange and yellow, mixed with a few 
red rays, will give us our idea of red, which is 
heightened by candle-light, because the orange is 
then more abundant. 
5. Grass-green is probably compounded of green, 
yellow, and orange, with more or less blue. Our 
idea of it will then be obtained piincipally from the 
yellow and orange mixed with a few green rays. 
It appears, therefore, that red and green to us will 
be nearly alike. I do not, however, understand, 
why the greens should assume a bluish appearance 
to us and to every body else, by candle-light, when 
it should seem that candle-light is deficient in blue. 
6. The green rays not being perceived by us, the 
remaining rays may, for aught that is known, com- 
pound a muddy red. 
_ 4. The observations upon the phenomena of 
pink and crimson, will explain this fact. 
