The importance of effectually supporting the Royal African Company of England impartially consider'd : shewing, that a free and open trade to Africa, and the support and preservation of the British colonies and plantations in America, depend upon maintaining the forts and settlements, rights and privileges belonging to that corporation, against the encroachments of the French, and all other foreign rivals in that trade : with a map, shewing the situation of the several European forts and settlements in that country : in a letter to a member of the House of Commons.