Color-blindness : its dangers and its detection (1880)
Jeffries, B. Joy (Benjamin Joy), 1833-1915 · Boston : Houghton, Osgood and Company · leaf 59
r hand, sufficiently excite the perceptive organs of green in the red- blind ; and it therefore seems to them black. Spectral yel- low seems to them a green ^•saturated" and intensely luminous ; and, as it constitutes the precisely saturated and very intense shade of that color, it can be… … the other primitive colors : it then appears, consequently, like a more intense but whitish shade of the same color as yellow and red. The greatest intensity of light in the spec- trum, according to Seebeck's observations, does not appear to the red-blind to be in the yell-ow region, as it does to…
Color Vision Defects
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
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