• Darwin Archive | Notes on botanical topics, variation and pangenesis, 1868 - 1882 | Romanes, Herbert Spencer, Darwin exchange on use and disuse, rudiments, 'indirect equilibria', 1874, 1874-01-01 - 1874-12-31 | of 'Expression ch 10 sheet no 3, later 392 [published pp 240-241], 1871-01-01 - 1882-04-30 | of 'Expression' ch 10 sheet no 3, later 392 [published pp 240-241], 1871-01-01 - 1882-04-30

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