• 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 | Letter from George John Romanes to Herbert Spencer; written at Dunskaith, Parkhill (Ross-shire) (abstract by Romanes), 1874-07-22 | George John Romanes to Herbert Spencer, 1874-07-22

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