[p.75] yellow gneiss markedly stratified. The transition formations are represented by a fine calcareous sandstone of a bright ochre colour: it is used at Meccah to adorn the exteriors of houses, bands of this stone being here and there inserted into the courses of masonry. There is also a small admixture of the greenish sandstone which abounds at Aden. The secondary formation is represented by a fine limestone, in some places almost fit for the purposes of lithography, and a coarse gypsum often of a tufaceous nature. For the superficial accumulations of the country, I may refer the reader to any description of the Desert between Cairo and Suez. [FN#1] The distance from Baghdad to Al-Madinah is 180 parasangs, according to ’Abd al-Karim: “Voyage de l’Inde, a la Mecque;” translated by M. Langles, Paris, 1797. This book is a disappointment, as it describes everything except Al-Madinah and Meccah: these gaps are filled up by the translator with the erroneous descriptions of other authors, not eye-witnesses. [FN#2] Here, it is believed, was fought the battle of Buas, celebrated in the pagan days of Al-Madinah (A.D. 615). Our dictionaries translate “Ghadir” by “pool” or “stagnant water.” Here it is applied to places where water stands for a short time after rain. [FN#3] Travels in Arabia, vol. 2, p, 217. The Swiss traveller was prevented by sickness from visiting it. The “Jazb al-Kulub” affords the following account of a celebrated eruption, beginning on the Salkh (last day) of Jamadi al-Awwal, and ending on the evening of the third of Jamadi al-Akhir, A.H. 654. Terrible earthquakes, accompanied by a thundering noise, shook the town; from fourteen to eighteen were observed each night. On the third of Jamadi al-Akhir, after the Isha prayers, a fire burst out in the direction of Al-Hijaz (eastward); it resembled a vast city with a turretted and battlemental fort, in which men appeared drawing the flame about, as it were, whilst it roared, burned, and melted like a sea everything that came in its way. Presently red and bluish streams, bursting from it, ran close to Al-Madinah; and, at the same time, the city was fanned by a cooling zephyr from the same direction. Al-Kistlani, an eye-witness, asserts that “the brilliant light of the volcano made the face of the country as bright as day; and the interior of the Harim was as if the sun shone upon it, so that men worked and required nought of the sun and moon (the latter of which was also eclipsed?).” Several saw the light at Meccah, at Tayma (in Nijd, six days’ journey from Al-Madinah), and at Busra, of Syria, reminding men of the Prophet’s saying, “A fire shall burst forth from the direction of Al-Hijaz; its light shall make visible the necks of the camels at Busra.” Historians relate that the length of the stream was four parasangs (from fourteen to sixteen miles), its breadth four miles (56? to the degree), and its depth about nine feet. It