• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Various movement phenomena: Sach's curvature, light and touch sensitivity, inter alia, 1875-09-28 - 1880-12-31 | Letter from Asa Gray to Charles Robert Darwin; written at Herbarium of Harvard, 1880-02-03 | Asa Gray to Charles Robert Darwin, 1880-02-03

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