sunlight, through the medium of a refractive vapour. Long before the first insect vision learnt to discriminate hetween red, yellow, and blue, the various rays which we call by those names poured down unnoticed upon the primeval world, Then, as now, the rainbow scattered ance blue ten thousand…
Color visio · Color · Vision des couleur · Couleur
Internet Archive · Canadiana.org · Public domain (published before 1931). Free to use for anything.
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