An essay on the publick debts of this kingdom : wherein the importance of discharging them is considered, the provisions for that purpose by the sinking-fund, and the progress therein hitherto made, are stated and explained ... : to which is subjoined an enquiry into the general convenience of reducing farther the interest of our publick debts below 4 per cent. per annum, in a letter to a member of the House of Commons.