After travelling ten miles without seeing a single habitation or human being of any sort, we arrived at a nullah, in which there were several pools of bitter spring-water, and some Egyptian geese swimming on them. This place was called Barham. On the right or northern side of the line of our march was the hill-range, about ten miles distant, at the foot of which, in the beds of small ravines, grew some belts of the jujube-tree and hardy acacias; but to the south the land was all sterile, and stretched away in a succession of little flat plains, circumscribed by bosses or hillocks of pure white limestone rock, which appeared standing unaffected by the weathering which had worn down the plains that were lying between them. Again these little enclosed plains sank in gentle gradation to their centres, where nullahs, like the one I was encamped upon, drained the land and refuse debris to the south and eastward, possibly to join eventually the Rhut Tug. 12th.--At 9 A.M. we were again in motion on our westward course, rising by a gentle incline to about half-way between Rhut Tug and a second Wadi Nogal farther on, called Yubbé Tug. Here, at the water-parting between these two large watercourses, was the tomb of the great founder of these mighty nations, Darud bin Ismail, and an excavated tumulus. There were also several bitter springs in the neighbourhood, with stone enclosures and numerous flocks of sheep tended by Somali. On passing the tomb I scarcely remarked it, so insignificant did it appear, whilst the Somali paid no homage to it whatever. But the tumulus excited more attention, and I was requested to examine it. Six years ago, the interpreter said, a Somali who wished to bury his wife in it, broke through its exterior, and found a hollow compartment propped up by beams of timber, at the bottom of which, buried in the ground, were several earthenware pots, some leaden coins, a ring of gold such as the Indian Mussulman women wear in their noses, and various other miscellaneous property. I was very much struck with the sleekness of the sheep, considering there appeared nothing for them to live upon; but I was shown amongst the stony ground here and there a little green pulpy-looking weed, an ice plant called Buskàlé, succulent, and by repute highly nutritious. It was on this they fed and throve. These Dumba sheep--the fat-tailed breed--appear to thrive on much less food, and can abstain longer from eating, than any others. This is probably occasioned by the nourishment they derive from the fat of their tails, which acts as a reservoir, regularly supplying, as it necessarily would do, any sudden or excessive drainage from any other part of their systems.