• Darwin Archive | Notes on botanical topics, variation and pangenesis, 1868 - 1882 | Draft letter to G.H. Lewes, 'against organs being formed by direct action of medium in distinct organisms', 1868, 1868-01-01 - 1868-12-31 | Letter from Charles Robert Darwin to George Henry Lewes; written at Freshwater; draft, 1868-08-07 | Charles Robert Darwin to George Henry Lewes, 1868-08-07

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