A Supplement to the detection of the state and situation of the present sugar planters of Barbadoes and the Leeward-Islands : shewing, among other new matters, that the surest way for England to command the sugar-market abroad, is to contract rather than inlarge her sugar colonies : in a letter from an inhabitant of one of his majesty's Leeward Caribee Islands, to a member of the House of Commons in England : to which is added, a letter from a traveller in the Caribbees to his friend in London.