An answer to a calumny [electronic resource] : with some remarks upon an anonimous pamphlet, address'd to his Grace the Duke of Newcastle, entitled, Some observations on the Assiento trade, as it has been exercised by the South-Sea Company, &c. Whereby The Damage which has, or is likely to accrue thereby to the British Commerce and Plantations, and particularly to Jamaica, is also considered. In two parts. By the Factor to the South-Sea Company, at whom the Calumny was aimed.