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![New Experiments on the Ocular Spectra of Light and Colours by Robert Waring Darwin, M D Read at the Royal Society, March 23 1786 [Paperback]](/itemImage/2/8/3/4/2_6344432.jpg "New Experiments on the Ocular Spectra of Light and Colours by Robert Waring Darwin, M D Read at the Royal Society, March 23 1786 [Paperback]")