INTRODUCTION. XI have attempted to explore. I was diplomatic agent to several maritime nations of Europe, which familiarised me with all ranks of society in those countries. I had a perfect knowledge of the commercial and travelling language of Africa, (the Arabic.) I corresponded myself with the Emperors, Princes, and Bashaws in this language ; my commercial connections were very extensive, amongst all the most respectable merchants who traded with Timbuctoo and other countries of Sudan. My residence at Agadeer, or Santa Cruz, in Suse, afforded me eligible opportunities of procuring information respecting the trade with Sudan, and the interior of Africa.

A long residence in the country, and extensive connections, enabled me to discriminate, and to ascertain who were competent and who were not competent to give me the information I required. I had opportunities at my leisure of investigating the motives that any might have to deceive me ; I had time and leisure also to investigate their moral character, and to ascertain the principles that regulated their respective conduct. Possessed of all these sources of information, how could I fail of procuring correct and authentic intelligence of the interior of Africa ; yet my account of the two Niles has been doubted by our fire-side critics, and the desultory intelligence of other travellers, who certainly did not possess those opportunities of procuring information that I did, has been substituted : but, notwithstanding this unaccountable