• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Geotropism. Extant subfolders: 'Apogeotropism', 'Localized sensitivity to Geotropism in tips of Radicles', 'Pods burying themselves', 1877-10-30 - 1880-04-20 | (Miscellaneous) Geotropism & apogeotropism, 1879-07-19

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