Some years prior to this period, a few distinguished individuals, induced by a very liberal spirit of curiosity, had formed themselves into an Association for promoting discoveries in the Interior of Africa, and were now prosecuting their researches with great activity and success. In the course of a few years they had investigated, and placed in a clearer point of view than had hitherto been done by geographers, some of the leading facts relative to the Northern part of that Continent; the characteristic differences of the principal tribes, their commercial relations, the routes of the great caravans, the general diffusion of the Mahomedan religion, and the consequent prevalence of the Arabic language throughout a considerable part of that vast continent. [Footnote: See Vol. I. of the Proceedings of African Association. London, 1810.] With the assistance of their distinguished Associate, Major Rennell, they were now proceeding to trace the principal geographical outlines of Northern Africa; and were endeavouring to ascertain the course of the great inland river Joliba or Niger, and to obtain some authentic information concerning Tombuctoo, a principal city of the interior and one of the great marts of African commerce. In the course of these enquiries, the Association, since their first establishment in 1788, had employed several persons, well qualified for such undertakings, upon missions into various parts of the African Continent. Several of these were known to have perished, either as victims of the climate, or in contests with the natives; [Footnote: The persons who had been sent out prior to this period, were Mr. Ledyard, Mr. Lucas, Major Houghton, and Mr. Horneman: subsequently to which, several others have been employed; viz. Mr. Nichols, Mr. Bourcard, &c.] and intelligence had lately been received of the death of Major Houghton, who had been sent out to explore the course of the Niger, and to penetrate, if possible, to Tombuctoo and Houssa. The Association appear to have found considerable difficulty in supplying Major Houghton's place; and had made known their readiness to give a liberal compensation to any person, competently qualified, who might be willing to proceed on this important and arduous mission.