This talk carried us across the Khubt, a pleasant three miles, and through a low ridge into a second smaller section. We now saw that, of the Sukhur, two stood together to the northeast, great grey striated piles of volcanic rock, reddish coloured where protected from the burning of the sun and the bruising of sandy winds. The third Sakhara, which stood a little apart, was the bubble rock which had roused my curiosity. Seen from near by, it more resembled a huge football half-buried in the ground. It, too, was brown in colour. The south and east faces were quite smooth and unbroken, and its regular, domed head was polished and shining and had fine cracks running up and over it like stitched seams: altogether one of the strangest hills in Hejaz, a country of strange hills. We rode gently towards it, through a thin shower of rain which came slanting strangely and beautifully across the sunlight.