Letter 11891
Darwin, C. R. to Allen, C. G. B.
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Read GA's book [The colour-sense] with "great interest". Makes criticisms and suggestions.
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Cannot believe in GA's theory of the origin of pleasure and pain.
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Is glad he defends sexual selection;
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CD finds A. R. Wallace's explanations "mere empty words" and for many years he has "quite doubted [ARW's] scientific judgment".
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Considers the possible effect of environmental colour on the colour tastes of animals.