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Dear Sir John
I am much obliged to you for taking the trouble to send me the drawings & Coins.—
I know so little of English rocks, that I cannot tell you what the stone is; it is very like what is formed on borders of coral-reefs & most islands in the Tropical seas, where shells are abundant.
Yours sincerely | C. Darwin
Please cite as “DCP-LETT-1210,” in Ɛpsilon: The Charles Darwin Collection accessed on