Copy letter from Henry Oldenburg, London, to James Winthrop, New England Letter to Mr Winthrop in New England inviting him to a Philosophical Correspondence ' Sir, Remember the History of New England, and particularly the matter of mines, of Tydes, of making salt in the Compendious and cheap way; thesse things well accounted of to the Society, will set you very high in their esteeme, to my knowlege.' 26 March 1664