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Darwin Correspondence Project

To J. G. Forchhammer   20 May [1850]

Down Farnborough Kent

May 20th

My dear Forchhammer

I ought to have written sooner to have thanked you very sincerely for your letter of the 27th of April: it told me quite fully & most clearly, all that I wanted to know of your Geology.1

Prof. Steenstrup’s specimen which I owe first to your kindness have been of great use & interest to me: I have now described 33 fossil Pedunculated Cirripides, & they are in Mr Sowerby’s hands to make drawings of.—

With my very sincere thanks | Believe me | Yours very truly | Charles Darwin


The letter has not been found. The geological information may have been in answer to letter to J. J. S. Steenstrup, 3 April [1850], asking about the relationship of the chalk formations of Scania, Faxoe, and Westphalia. In Fossil Cirripedia (1851): 7, CD cited Forchhammer and Steenstrup as his authorities for considering them equivalent formations, more recent than the common Upper or White Chalk and equivalent to the formation of Maastricht.


Fossil Cirripedia (1851): A monograph on the fossil Lepadidæ, or, pedunculated cirripedes of Great Britain. By Charles Darwin. London: Palaeontographical Society. 1851.


Thanks JGF for geological information.

Steenstrup’s cirripede specimens have been of great use and interest. CD has now described 33 fossil pedunculated cirripedes.

Letter details

Letter no.
Charles Robert Darwin
Johan Georg Forchhammer
Sent from
Source of text
University of Copenhagen, Mineralogical Museum Archives
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 1328,” accessed on 17 September 2021,

Also published in The Correspondence of Charles Darwin, vol. 4