To commence from the south. The division between the Arab tribes of the southern Teháma and Turkish Yemen commences some ten miles east of the Straits of Bab el-Mandeb, and so includes the promontory of Sidi Sheikh, which projects toward Perim Island, from which it is divided by a narrow strait a mile and a half in width. From thence the frontier runs in a north-easterly direction, passing a little to the east of Taiz, from which it again turns more directly east, passing to the south of Mavia, and, skirting the territory of the Amir of Dhala, includes the town of Kátaba. From this spot it turns almost due north, keeping well to the east of Yerim and Dhamar, although these towns, as a matter of fact, form practically the eastern boundary of the Turkish Yemen. From Dhamar to Sanaa the frontier runs almost due north and south, and may be said to exist about forty to fifty miles east of a straight line drawn between these two cities. From Sanaa to the north the Turks claim authority as within their limits over all the country lying to the west of a line drawn from Sanaa to the south-eastern corner of the province of the Hejaz, although over the Asir and other inaccessible mountain tribes their authority is purely nominal, and has never been acknowledged to any extent. It must not be thought that all the country lying within the frontier thus described is securely under Turkish rule, for there are whole tribes which do not, nor ever have done so, acknowledge anything more than a nominal subjection to the Sublime Porte. That these notes upon the geography of the Yemen will prove of but little value to _savants_ the writer knows only too well; but if his journey was unproductive of any scientific or historical discoveries, it must be borne in mind the period at which it was undertaken: that not only was a rebellion still taking place, that a month or two before had shaken the whole country to its very foundations, but also that the author was by the Turks treated as a spy, and was more than once in great personal danger from the Arabs. Under these circumstances he feels that he cannot be blamed if his journey was devoid of any great results. All that he can boast to have brought back with him is a story of travel and adventure, and numerous photographs and notes, that will tend to throw light upon the present condition of the Yemen, especially on what has been taking place in that country since the Turkish occupation of the highlands in 1872. His narrative of travel tells a story of long night marches, and of days spent in hiding; of a sojourn in a Turkish prison; and this story, he trusts, will prove sufficient evidence that he had little or no opportunity for research. It was owing to a mere chance that his notes and photographs were saved from destruction by the Turkish authorities at Sanaa.