• Darwin Archive | 'Origin of species': portfolios II | Hybridism, sterility, 1841-1857 | NS II Hybridism-17 Draft: Natural Selection, Chap 9, rejected Ms pp 25-36, 1857-09-30 - 1857-12-29 | Verso of Ms p 26B, 1857-09-30 - 1857-12-29

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