Concerning the ateliers, details will be found in the following pages. Many of them suggest a kind of compromise between the camps and settlements of the Stone Age, where, e.g. at Pressigny and Grimes' Graves, the only remnant of man is a vast strew of worked silexes; and the wandering fraternity of Freemasons who hutted themselves near the work in hand. And I would here lay special stress upon my suspicion that the ancestors of the despised Hutaym may have been the Gypsy-caste that worked the metals in Midian. For the date of the many ruins which stud the country, I will assume empirically that their destruction is coeval with that of the Christian Churches in Negeb, or the South Country,[EN#86] that adjoins Midian Proper on the north-west. It may date from either the invasion of Khusrau Anúshírawán, the conquering Sassanian King Chosroes (A.D. 531-579); or from the expedition, sent by the Caliph Omar and his successors, beginning in A.D. 651. But, as will appear in the course of these pages, there was a second destruction; and that evidently dates from the early sixteenth century, when Sultán Selim laid out his maritime road for the Hajj-caravan. Before that time the Egyptian caravans, as will be seen, marched inland, and often passed from Midian to El-Hijr. Chapter V. Work At, and Excursions From, Magháir Shu'Ayb. By the blessing of Nebi Shu'ayb and a glance from his eyrie, I at once suspected that the western Shigd was the "Mountain on a mountain" alluded to by Haji Wali;[EN#87] and, on January 12, 1878, I ascertained that such was the case. The old man had given me a hand-sketch of the most artless, showing a gorge between two rocks, a hill of two stages to the left or west, and a couple of Wadys draining it to the sea; one (Wady Makná) trending northwest, and the other (Wady 'Afál) south-west. The word "Ishmah," affixed to the northern part of the route, is evidently the Hismá plateau, and not, as I had supposed it to be, the Jebel Tayyib Ism. Nor had we any difficulty in discovering Haji Wali's tree, a solitary Mimosa to the right of the caravan-track, springing from the sands of the Shigdawayn gorge. The latter is formed by the sister-blocks before alluded to. The western Shigd, on the right of the Wady 'Afál, is composed of carbonate of lime and sandstones dyed with manganese, the whole resting upon a core of grey granite; the formation is the same as the eastern feature, but the lines of the latter are gentler, and the culminating tower is wanting.