• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Heliotropism. Major extant folder: Heliotropism. Extant subfolders: Oats, Beta, Cabbages, Philoxis, 1877-01-06 - 1879-09-07 | Letter from Sir Francis Darwin to Charles Robert Darwin; written at Botanisches Institut, Würzburg; first sheet only, 1878-07-21 | Sir Francis Darwin to Charles Robert Darwin, 1878-07-21

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