• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Circumnutation of leaves, sleep. Extant subfolders: Cassia, Lotus, Melilotus, 1873-11-24 - 1878-12-31 | Cassia pubescens, 1873-06-10 - 1882-06-12 | Cassia pubescens [tracing with backing sheet], 1873-06-10 - 1882-06-12

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