HERING'S TEST'S THEORY
\hˈɜːɹɪŋz tˈɛsts θˈi͡əɹi], \hˈɜːɹɪŋz tˈɛsts θˈiəɹi], \h_ˈɜː_ɹ_ɪ_ŋ_z t_ˈɛ_s_t_s θ_ˈiə_ɹ_i]\
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Of color-blindness: there are three visual substances in the retina-blue-yellow, red-green, and white-black, by the chemical reactions of which color-perception is effected, the absence of one of these substances results in inability to perceive the colors or shades by the reaction of which they are sensed.
By Stedman, Thomas Lathrop
