Image 7.1 Letter from Charles Darwin to Joseph Dalton Hooker, 1 December (1879) regarding the movement of cotton plant cotyledons

Image 7.1 Letter from Charles Darwin to Joseph Dalton Hooker, 1 December (1879) regarding the movement of cotton plant cotyledons.jpg
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Image 7.1 Letter from Charles Darwin to Joseph Dalton Hooker, 1 December (1879) regarding the movement of cotton plant cotyledons