• 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 | Partial drafts of Chapters 7 and 8, 1879 - 1882 | Chap. 8, 'Modified circumnutation: movements excited by light', draft (partial) | Fig 175

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