PROF. PEDDIE states in his letter in NATURE of September 8, p. 362, that the facts that I have given as totally opposed to the trichromatic theory can be explained by it. If he will show how this can ...

THERE is certainly no living authority on “colour-vision” more competent to throw light on that intricate and perplexing subject than the author of this work. Sir William Abney has attacked the ...

2. He advanced the trichromatic theory of color vision, brilliantly inferring that there were three different types of color receptors in the eye, which responded specifically to blue, green, and red ...