Ramusio imagined that the discoveries of Cada Mosto might tend to great importance, as he considered the rivers Senegal and Rio Grande to be branches of the Niger, by which means the Europeans might open a trade with the rich kingdoms of Tombuto and Melli on that river, and thus bring gold from the countries of the Negroes, by an easier, safer, and more expeditious manner, than as conveyed by the Moors of Barbary by land, over the vast and dangerous deserts that intervene between the country on the Niger and Senegal rivers, and Barbary. As, by the account of Leo, salt is the most valuable commodity throughout the countries of the Negroes, Ramusio proposed that the ships should take in cargoes of salt at the island of _Sal_, one of the Cape de Verds, and thence supply the countries on the Niger, which was reported to be navigable for 500 miles into the interior; and that they should bring back gold and slaves in return; the latter to be brought to market at St Jago, another of the Cape de Verd islands, where they would be immediately bought up for the West Indies. All this fine speculation, however, rested on mistaken foundations; as the Niger is altogether an inland river, running to the east, and has no communication with the Senegal and Gambia, which run west into the Atlantic. Yet time, and the civilization of the natives on the Senegal and Gambia, may hereafter realize this scheme of a valuable traffic into the interior of Africa; but it is fervently to be hoped, that the trade in slaves may never be revived.