While residing in Ágades I was not yet aware of all the points of information which I have been able to collect in the course of my travels, and I was at a loss to account for the identity of language in places so widely separated from each other by immense tracts of desert, and by countries which seemed to have been occupied by different races. But while endeavouring, in the further course of my journey, to discover as far as possible the history of the nations with whom I had to deal, I found the clue for explaining this apparently marvellous phenomenon, and shall lay it before my readers in the following chapter. To the Tawáti ʿAbdallah I was indebted for information on a variety of interesting matters, which I found afterwards confirmed in every respect. In a few points his statements were subject to correction, and still more to improvement, but in no single case did I find that he had deviated from the truth. I state this deliberately, in order to show that care must be taken to distinguish between information collected systematically by a native enjoying the entire confidence of his informant, and who, from his knowledge of the language and the subject about which he inquires, is able to control his informant’s statements, and that which is picked up incidentally by one who scarcely knows what he asks. But to return to my diary, the visits paid me by the other people of Tawát became less frequent, as I had no coffee to treat them with; but I was rather glad of this circumstance, as my time was too short for labouring in that wide field of new information which opened before me, and it was necessary to confine myself at present to narrower limits. In this respect I was extremely fortunate in having obeyed my impulse to visit this place, which, however desolate it may appear to the traveller who first enters it, is still the centre of a large circle of commercial intercourse, while Tin-téllust is nothing but a small village, important merely from the character of the chief who resides in it, and where even those people who know a little about the country are afraid to communicate that very little. I would advise any traveller who should hereafter visit this country to make a long stay in this place, if he can manage to do so in comfort; for I am sure that there still remains to be collected in Ágades a store of the most valuable and interesting information.