Researches in Colour Vision and the Trichromatic Theory. By Sir William de W. Abney Pp. xi + 418 + 5 plates. (London: Longmans, Green and Co., 1913.) Price 21s. net.

To us, the color orange is super visible because humans have something called trichromatic color vision. When light enters ...

Humans have trichromatic vision, meaning we have three types of color-detecting cones in our eyes. These are sensitive to red ...