Translation of a letter, 'Sir Hans Sloane's letter to the Marquis de Caumont, concerning this stone' by Hans Sloane Sloane responds to a letter from the Marquis de Caumont [Joseph de Seytres] with his observations on bladder stones passed by patients and bladder stones in his collection of curiosities. Engraved figure of bladder stones attached. Subject: Physiology Published in Philosophical Transactions as 'Sir Hans Sloane, Bart. Pr. R. S. his answer to the Marquis de Caumont's letter, concerning this stone'. Translated from Latin by Tho [Thomas] Stack. Read to the Royal Society on 18 March 1735. [1730s]