Narrative of two voyages to the river Sierra Leone, during the years 1791-2-3 : with a succinct account of the distresses and proceedings of that settlement, a description of the manners, diversions, arts, commerce, cultivation, custom, punishments, &c. and every interesting particular relating to the Sierra Leone Company : also, the present state of the slave trade in the West Indies, and the improbability of its total abolition /