• 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 | Phalaris [early draft text and summary of sheets numbered 1-8], 1873-01-01 - 1882-04-30 | [of 'Descent'] ch 18 p 51 [top two thirds], 1870-01-01 - 1882-04-30

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