The Hand of Darwin: Transmutation Notebook D, Page 140

The Hand of Darwin: Transmutation Notebook D, Page 140

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Transmutation Notebook D, Page 140

(Reprinted with permission of Syndics of Cambridge University Library, DAR 123:140)

» listen (mp3, 1:17) to David Kohn provide a broader context to this passage and why Darwin wrote it

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When we multiply the effects of earthquakes, elevating forces in raising continents, & forming mountain-chains, when we estimate the matter removed by the waves of the sea, on beaches— we really, measure the rapidity of change of form, & instincts in the animal kingdom.— It is the unit of our calendar.— epochs & creations, reduce themselves to the revolutions of our system in the Heavens.— […]

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has co-authored several books about Charles Darwin, including Darwin: The Life of a Tormented Evolutionist. He's been researching and teaching Darwin for more than 30 years in Cambridge, England.