• 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 | Trifolium subterraneum [figs 221-223], 1873-07-22 - 1882-07-26 | Trifolium subterraneum [figs 221-222] [tracings with backing sheet], 1873-07-22 - 1882-07-26

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