• Darwin Archive | 'Power of movement': draft chapters, 1877-1882 | 'Power of movement': revised fair copy of Chapter 7 and partial drafts of chapters 7 and 8, 1879 - 1882 | Continuation of revised fair copy of Chapter 7, 'Modified circumnutation: nyctitropic or sleep movements of leaves', 1879 - 1882 | Ms p 90

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