• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Miscellany: photographs of experiments, notes on various topics, 1877-05-19 - 1881-09-15 | Leaves injured at night by free radiation 'Nature' 24: 459, 1881-09-15 | 'Nature' 24: 460, 1881-09-15

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