Abstract
In 1889 I put forward the theory that light perception and colour perception were quite distinct and were distinguished by different cells in the brain, and that colour-blindness was a defect in the evolution of colour perception. This theory enabled me to predict a large number of new facts, and with my experience as special examiner and adviser to the Board of Trade on colour vision and eyesight for fourteen years, with the very fine apparatus in my laboratory, no fact has been discovered which is not in agreement with the theory.
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