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Darwin's questions on caterpillar colouring


Letter from Charles Darwin to Wallace, asking why some caterpillars are brightly coloured, dated February 1867. (extract)

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Wallace Letters Online

Letter to Alfred Russel Wallace from the Royal Society, about his Darwin Medal award

View high resolution scans and transcripts of Alfred Russel Wallace's correspondence, including all surviving letters between him and Charles Darwin.

Explore Wallace's correspondence