• 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 | Nephrodium molle, 1873-06-01 - 1882-06-03 | Nephrodium molle, 1873-06-01 - 1873-06-03

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