• Darwin Archive | 'Natural Selection': draft chapters, 1856-1858 | 'Natural Selection': chapter 3, 'On the possibility of all organic beings occasionally crossing [...]', 1856 | 'Natural selection' chapter 3 (On the possibility of all organic beings occasionally crossing and on the remarkable susceptibility of the reproductive system to external agencies) | Letter from Asa Gray to Charles Robert Darwin; written at Cambridge (Mass), 1857-06-01 | Asa Gray to Charles Robert Darwin, 1857-06-01

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