Copy letter from Claude Joseph Geoffroy, Paris, to the President [Hans Sloane] ' Extracts of a Letter from Monsieur Geoffroy to the President, concerning t he french translation of the Philosophical Transactions ; the Subject of the last publick Meeting of the Royal Academy of Sciences : Monsieur Du Hamel's Experiments of tinging the Bones of Animals red with the Madder Root : and a Dispute subsisting between two Academicians concerning the Calculus integralis. ' Translated and read to the Royal Society on 12 April 1739 12 April 1739