Loose stones again strewed the approach to the Marie range, which is of trap formation, of a slaty texture, stained with red iron oxide, and intersected by veins of iron clay. A breach in the hills, here about a thousand or twelve hundred feet high, formed a steep sloping ridge of lava rocks, containing quantities of carbonate of lime, disposed in rhomboids and hexagonal sheets. In this nook, surrounded by a thick jungle of acacia, were sundry basins filled with clear water, to which the solar rays had not penetrated. They afforded most refreshing draughts; and the skins having been replenished, the encampment was formed at Dawaylaka, a full mile beyond. Marie is not a word of either Arabic or Dankali derivation; whence it seems not improbable that this bold range of hills may in days of yore have been named by some wanderer from the West. A fine fresh morning succeeded to a very sultry night, passed upon the hard hot stones; and at break of day, the cattle having been taken to the pools, where, at so early an hour, they would drink but little, the skins were again replenished, and the caravan pursued its march to Oomergooloof, which can boast of no water at any season. Of two roads, the lower, but more level, was adopted, in consequence of the exhaustion of the beasts of burthen. It led across a dry desert plain of six miles, over which the delusion of mirage was complete. Covering the valley far as the eye could reach, to the foot of the hills which rise abruptly on all sides, it imparted the appearance of an extensive bay, shut in by projecting headlands--a still calm lake, so unmoved by the wind that every cliff was most distinctly reflected on the mirror of its glassy bosom. Approaching from a higher level, a ripple played upon the surface of the visionary water; and the vapour being too subtle to screen irregularities of the ground, the aqueous expanse soon became gradually disunited, until it ultimately vanished altogether. The scene, cool and pleasant whilst it endured, formed a striking contrast to the baked alluvial desert under foot, destitute of even a vestige of vegetation, but over which was wafted a zephyr as unlooked-for as refreshing. Thrown in a particular way, and on certain atoms, rays of light produce illusions to the vision which are often embodied after the likeness of objects most deeply dwelling in the imagination. Thus it was that the character of the headlands of Dullool, square and perpendicular, together with an islet riding like a ship at her cable in the centre of the molten basin, aided the striking similarity of names in the respective neighbourhoods, to bring vividly before the eyes of all, the apparition of the bay of Goobut el Kharab.