To the Secretary of the American Philosophical Society1 23 May 1839
Geological Society of London | Somerset House.
23rd May 1839
I am requested by the Geological Society to express their thanks for the Proceedings of the American Philosophical Society vol 1 No 6 and to assure you that the Society are much honored by this mark of consideration
I have the honor to be | Sir | Your most obedient | and very humble Servant | Charles Darwin | Secretary To | The Secretary of | The American Philos. Soc.
As Secretary of the Geological Society of London, CD formally expresses thanks for the American Philosophical Society’s Proceedings, vol. 1, no. 6.
Please cite as
Darwin Correspondence Project, “Letter no. 511,” accessed on 25 October 2016, http://www.darwinproject.ac.uk/DCP-LETT-511