Heinrich Barth made a prolonged stay in various Hausa cities at dates between 1851 and 1855.
To Barth is due a great deal of our knowledge of the country.
This traffic was carried on through Nupe "to the great damage," says Barth, "of the commerce and the most unqualified scandal of the Arabs, who think that the English, if they would, could easily prevent it."
The over-seas traffic in slaves did not continue long after the date (1851) to which Barth referred, but slave-raiding by the Fula went on unchecked up to the moment of the British occupation of the country.
See Barth, Reise durch das Innere der europaischen Turkei (Berlin, 1864); A.