• Darwin Archive | 'Power of movement': draft chapters, 1877-1882 | 'Power of movement': draft of Chapters 5-6, 1879 - 1882 | Chap. 6 'Modified circumnutation: sleep or nyctitropic movements, their use: sleep of cotyledons', 1879-01-01 - 1882-04-30 | Ms p 446 [397 in pencil]

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