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Excerpt from Researches on Colour-Blindness: With a Supplement on the Danger Attending the Present System of Railway and Marine Coloured Signals
I will also mention that the inquiry into the Re lation of the Colour of the Choroid to colour-vision, which occupies pages 88-104 of this volume, and par takes in great part of the character of an Excursus or Episode, is treated in several respects more fully in a paper read to the Royal Society of Edinburgh last April, and entitled On the Extent to which the Re ceived Theory of Vision requires us to regard the Eye as a Camera Obscura. It is printed in Trans. R. S. E., Vol. Xxi., Part n., p. 327.
I have many parties to thank for assistance in pro secuting these researches. Professor Kelland most kindly aided me in the strictly optical portions of my inquiry. Mr William Swan rendered me a similar ser vice, and so did Dr Thomas Wright; and latterly I profited largely, as the Supplement and Appendix will sufficiently show, by the interchange of opinions with Mr James Clerk Maxwell.
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