Abstract
THE remarks of Mr. Everett at the close of his paper (NATURE, vol. xxi. p. 62) on Prof. Hering's theory, seem to be founded on a misconception. Prof. Hering assumes, not four, but six elements of colour sensations connected by the equations—
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TENNANT, J. Colour-Blindness. Nature 21, 132 (1879). https://doi.org/10.1038/021132c0
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DOI: https://doi.org/10.1038/021132c0
