• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Heliotropism (Phototropism), 1873-12-18 - 1880-01-28 | Cyclamen persicum, 1873-02-18 - 1882-02-21 | [of 'Fertilisation'] Introduction p 8 [top half], 1875-01-01 - 1882-04-30

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