Next day the expedition entered the pass of Gible Asswaa, or Black Mountains, a region of dreariness and desolation. In every direction masses of basalt seemed to have been upheaved by some convulsion of nature, whilst in some places the rock had all the semblance of iron suddenly cooled after leaving the furnace. Much of the road was of the worst character for travelling, for it was not only hard and broken, but ridged with knife-like edges, which gashed the camels’ feet and lamed them. This sterile region extended for more than fifty miles without even a shrub or an insect to invite observation. To add to their trials, the travellers were four days and a-half without water save that carried by the camels, which from being constantly acted upon by the sun was always more than tepid and lost much of its relish. In these mountains the heat was excessive. When exposed to the full blaze of the sun the mercury in the thermometer rushed up speedily to 150°; and afterwards, when corporal Church withdrew the instrument from the sand in which he had buried it about six inches deep, the indication was 130°. After passing the Black Mountains, the corporal counted in one day nine skeletons of camels which had fallen in the waste from exhaustion. The expedition now traversed a far-spreading plain, and being short of water, pushed on night and day by long marches for the well called Omhul-obid, or the Mother of Slaves. Before gaining it, they were wearied with sixty-six hours’ exertion in the saddle out of eighty, and the camel which Church had ridden from Tripoli, fell dead at Erfad from fatigue. In a few days afterwards—5th August, 1853—the expedition reached Moorzuk, where private Maguire joined it on the 31st of the same month. This soldier, cool and confident, journeyed from Tripoli with three or four Arabs who were unable to speak a word of English. He was equally unable to exchange with them a word of Arabic. Gesture and grimace, therefore, were the means employed by him to communicate his orders and to express his feelings of satisfaction or discontent; but notwithstanding this impediment, he gallantly drove on, and in thirty-four days accomplished the journey under a fierce sun, without casualty and with credit. On the 16th October the adventurers left Moorzuk, and had a toilsome journey as far as Gatrone, where they arrived on the 24th of the same month. Seven days Dr. Vogel and his sappers remained at this place to await the arrival of the rest of the lagging camels and stores. In that time they were joined by a caravan of merchants with about fourteen Arabs from Egypt, going to Bornou to purchase slaves.