While he spoke we scoured along the dazzling plain, now nearly bare of trees, and turning slowly softer under foot. At first it had been grey shingle, packed like gravel. Then the sand increased and the stones grew rarer, till we could distinguish the colours of the separate flakes, porphyry, green schist, basalt. At last it was nearly pure white sand, under which lay a harder stratum. Such going was like a pile-carpet for our camels’ running. The particles of sand were clean and polished, and caught the blaze of sun like little diamonds in a reflection so fierce, that after a while I could not endure it. I frowned hard, and pulled the head-cloth forward in a peak over my eyes, and beneath them, too, like a beaver, trying to shut out the heat which rose in glassy waves off the ground, and beat up against my face. Eighty miles in front of us, the huge peak of Rudhwa behind Yenbo was looming and fading in the dazzle of vapour which hid its foot. Quite near in the plain rose the little shapeless hills of Hesna, which seemed to block the way. To our right was the steep ridge of Beni Ayub, toothed and narrow like a saw-blade, the first edge of the sheaf of mountains between the Tehama and the high scarp of the tableland about Medina. These Tareif Beni Ayub fell away on their north into a blue series of smaller hills, soft in character, behind which lofty range after range in a jagged stairway, red now the sun grew low, climbed up to the towering central mass of Jebel Subh with its fantastic granite spires.

A little later we turned to the right, off the pilgrim road, and took a short cut across gradually rising ground of flat basalt ridges, buried in sand till only their topmost piles showed above the surface. It held moisture enough to be well grown over with hard wiry grass and shrubs up and down the slopes, on which a few sheep and goats were pasturing. There Tafas showed me a stone, which was the limit of the district of the Masruh, and told me with grim pleasure that he was now at home, in his tribal property, and might come off his guard.

Men have looked upon the desert as barren land, the free holding of whoever chose; but in fact each hill and valley in it had a man who was its acknowledged owner and would quickly assert the right of his family or clan to it, against aggression. Even the wells and trees had their masters, who allowed men to make firewood of the one and drink of the other freely, as much as was required for their need, but who would instantly check anyone trying to turn the property to account and to exploit it or its products among others for private benefit. The desert was held in a crazed communism by which Nature and the elements were for the free use of every known friendly person for his own purposes and no more. Logical outcomes were the reduction of this licence to privilege by the men of the desert, and their hardness to strangers unprovided with introduction or guarantee, since the common security lay in the common responsibility of kinsmen. Tafas, in his own country, could bear the burden of my safe-keeping lightly.

The valleys were becoming sharply marked, with clean beds of sand and shingle, and an occasional large boulder brought down by a flood. There were many broom bushes, restfully grey and green to the eye, and good for fuel, though useless as pasture. We ascended steadily till we rejoined the main track of the pilgrim road. Along this we held our way till sunset, when we came into sight of the hamlet of Bir el Sheikh. In the first dark as the supper fires were lighted we rode down its wide open street and halted. Tafas went into one of the twenty miserable huts, and in a few whispered words and long silences bought flour, of which with water he kneaded a dough cake two inches thick and eight inches across. This he buried in the ashes of a brushwood fire, provided for him by a Subh woman whom he seemed to know. When the cake was warmed he drew it out of the fire, and clapped it to shake off the dust; then we shared it together, while Abdulla went away to buy himself tobacco.

They told me the place had two stone-lined wells at the bottom of the southward slope, but I felt disinclined to go and look at them, for the long ride that day had tired my unaccustomed muscles, and the heat of the plain had been painful. My skin was blistered by it, and my eyes ached with the glare of light striking up at a sharp angle from the silver sand, and from the shining pebbles. The last two years I had spent in Cairo, at a desk all day or thinking hard in a little overcrowded office full of distracting noises, with a hundred rushing things to say, but no bodily need except to come and go each day between office and hotel. In consequence the novelty of this change was severe, since time had not been given me gradually to accustom myself to the pestilent beating of the Arabian sun, and the long monotony of camel pacing. There was to be another stage tonight, and a long day to-morrow before Feisal’s camp would be reached.

So I was grateful for the cooking and the marketing, which spent one hour, and for the second hour of rest after it which we took by common consent; and sorry when it ended, and we re-mounted, and rode in pitch darkness up valleys and down valleys, passing in and out of bands of air, which were hot in the confined hollows, but fresh and stirring in the open places. The ground under foot must have been sandy, because the silence of our passage hurt my straining ears, and smooth, for I was always falling asleep in the saddle, to wake a few seconds later suddenly and sickeningly, as I clutched by instinct at the saddle post to recover my balance which had been thrown out by some irregular stride of the animal. It was too dark, and the forms of the country were too neutral, to hold my heavy-lashed, peering eyes. At length we stopped for good, long after midnight; and I was rolled up in my cloak and asleep in a most comfortable little sand-grave before Tafas had done knee-haltering my camel.

Three hours later we were on the move again, helped now by the last shining of the moon. We marched down Wadi Mared, the night of it dead, hot, silent, and on each side sharp-pointed hills standing up black and white in the exhausted air. There were many trees. Dawn finally came to us as we passed out of the narrows into a broad place, over whose flat floor an uneasy wind span circles, capriciously in the dust. The day strengthened always, and now showed Bir ibn Hassani just to our right. The trim settlement of absurd little houses, brown and white, holding together for security’s sake, looked doll-like and more lonely than the desert, in the immense shadow of the dark precipice of Subh, behind.............