During the last four days I attentively observed the general face of the country. This line is a succession of low plains and basins, here quasi-circular, there irregularly oblong, surrounded by rolling hills and cut by Fiumaras which pass through the higher ground. The basins are divided by ridges and flats of basalt and greenstone averaging from one hundred to two hundred feet in height. The general form is a huge prism; sometimes they are table-topped. From Al-Madinah to Al-Suwayrkiyah the low beds of sandy Fiumaras abound. From Al-Suwayrkiyah to Al-Zaribah, their place is taken by “Ghadir,” or hollows in which water stagnates. And beyond Al-Zaribah the traveller enters a region of water-courses tending West and South-West The versant is generally from the East and South-East towards the West and North-West. Water obtained by digging is good where rain is fresh in the Fiumaras; saltish, so as to taste at first unnaturally sweet, in the plains; and bitter in the basins and lowlands where nitre effloresces and rain has had time to become tainted. The landward faces of the hills are disposed at a sloping angle, contrasting strongly with the perpendicularity of their seaward sides, and I found no inner range corresponding with, and parallel to, the maritime chain. Nowhere had I seen a land in which Earth’s anatomy lies so barren, or one richer in volcanic and primary formations.[FN#19] Especially [p.74] towards the South, the hills were abrupt and highly vertical, with black and barren flanks, ribbed with furrows and fissures, with wide and formidable precipices and castellated summits like the work of man. The predominant formation was basalt, called the Arabs’ Hajar Jahannam, or Hell-stone; here and there it is porous and cellular; in some places compact and black; and in others coarse and gritty, of a tarry colour, and when fractured shining with bright points. Hornblende is common at Al-Madinah and throughout this part of Al-Hijaz: it crops out of the ground edgeways, black and brittle. Greenstone, diorite, and actinolite are found, though not so abundantly as those above mentioned. The granites, called in Arabic Suwan,[FN#20] abound. Some are large-grained, of a pink colour, and appear in blocks, which, flaking off under the influence of the atmosphere, form ooidal blocks and boulders piled in irregular heaps. Others are grey and compact enough to take a high polish when cut. The syenite is generally coarse, although there is occasionally found a rich red variety of that stone. I did not see eurite or euritic porphyry except in small pieces, and the same may be said of the petrosilex and the milky and waxy quartz.[FN#21] In some parts, particularly between Yambu’ and Al-Madinah, there is an abundance of tawny