To J. E. Gray 19 January 
Down Bromley Kent
My dear Sir
I write one line to say how very sincerely obliged I feel to you, for so very kindly acceding to my troublesome request.—1
Believe me | Yours truly obliged | Charles Darwin
Is obliged for JEG’s assistance.
Please cite as
Darwin Correspondence Project, “Letter no. 1822A,” accessed on 19 January 2017, http://www.darwinproject.ac.uk/DCP-LETT-1822A