As Secretary of the Geological Society of London, CD formally expresses thanks for the American Philosophical Society's Proceedings, vol. 1, no. 6.
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
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.
- f1 511.f1Franklin Bache.