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Darwin Correspondence Project

To F. T. Köppen   18 November 1874

Down, | Beckenham, Kent. | Railway Station | Orpington. S.E.R.

Nov 18 1874

Dear Sir

I am very much obliged to you for having kindly informed me of Jahn’s work, of which I had never heard.1 From what you say, it would have been of the greatest use to me before writing the Descent of Man or correcting a second edition which is now just published.

Pray believe me | dear Sir | yours faithfully & obliged | Charles Darwin


See letter from F. T. Köppen, 13 November 1874 and n. 3. CD refers to Ferdinand Jahn and Jahn 1842.


Jahn, Ferdinand. 1842. Die abnormen Zustände des menschlichen Lebens als Nachbildungen und Wiederholungen normaler Zustände des Thierlebens. Eisenach: Johann Friedrich Baerecke.


Thanks FTK for telling him of Jahn’s work [see 9719], of which CD had not heard. It would have been of greatest use in writing Descent.

Please cite as

Darwin Correspondence Project, “Letter no. 9722,” accessed on 18 September 2021,

Also published in The Correspondence of Charles Darwin, vol. 22