Every succeeding traveller is largely indebted to the labours of his predecessor. Thus our expedition would never have been able to achieve what it did, if Oudney, Denham, and Clapperton had not gone before us; nor would these travellers have succeeded so far, had Lyon and Ritchie not opened the road to Fezzán; nor would Lyon have been able to reach Tejérri, if Captain (now Rear-admiral) Smyth had not shown the way to Ghírza. To Smyth, seconded by Colonel Warrington, is due the merit of having attracted the attention of the British Government to the favourable situation of Tripoli for facilitating intercourse with Central Africa; and if at present the river-communication along the Tsádda or Bénuwé seems to hold out a prospect of an easier approach to those regions, the importance of Tripoli must not be underrated, for it may long remain the most available port from which a steady communication with many parts of that continent can be kept up. I had the good fortune to see my discoveries placed on a stable basis before they were brought to a close, by the astronomical observations of Dr. Vogel[1], who was sent out by Her Britannic Majesty’s Government for the purpose of joining the expedition; and I have only to regret that this gentleman was not my companion from the beginning of my journey, as exact astronomical observations, such as he has made, are of the utmost importance in any geographical exploration. By moving the generally-accepted position of Kúkawa more than a degree to the westward, the whole map of the interior has been changed very considerably. The position assigned by Dr. Vogel to Zínder gives to the whole western route, from Ghát through the country of Ásben, a well-fixed terminating point, while at the same time it serves to check my route to Timbúktu. If, however, this topic be left out of consideration, it will be found that the maps made by me on the journey, under many privations, were a close approximation to the truth. But now all that pertains to physical features and geographical position has been laid down, and executed with artistic skill and scientific precision, by Dr. Petermann. The principal merit which I claim for myself in this respect is that of having noted the whole configuration of the country; and my chief object has been to represent the tribes and nations with whom I came in contact, in their historical and ethnographical relation to the rest of mankind, as well as in their physical relation to that tract of country in which they live. If, in this respect, I have succeeded in placing before the eyes of the public a new and animated picture, and connected those apparently savage and degraded tribes more intimately with the history of races placed on a higher level of civilization, I shall be amply recompensed for the toils and dangers I have gone through.