I would hardly have trusted Nostril’s promises, but, as things turned out, he never did molest the little boy, or even try to. We were not many days into the desert when Nostril began noticeably to suffer from some painful ailment in his under parts. If, as I suspected, the slave had deliberately made one of the camels lame to make us stop in Kashan, then another of the beasts was now exacting revenge. Every time Nostril’s camel made a misstep and jounced him, he would cry out sharply. Soon he had his saddle pillowed with everything soft he could find among our packs. But then, every time he went away from our camp fire to make water, we could hear him groaning and thrashing about and cursing vehemently.

“One of the Kashan boys must have clapped him with the scola-mento,” said Uncle Mafio derisively. “Serves him right, for being unvirtuous—and indiscriminate.”

I had not then and indeed never have been similarly afflicted myself, for which I give more thanks to my good fortune than to my virtue or my discrimination. Nevertheless, I might have shown more comradely sympathy to Nostril, and laughed less at his predicament, if I had not been thankful that his zab was giving him other concerns than trying to put it into my young ward. The slave’s ailment gradually abated and finally went away, leaving him apparently no worse for the experience, but by that time other events had occurred to put Aziz beyond threat of his lechery.

A tent, or some shelter like a tent, is an absolute necessity in the Dasht-e-Kavir, for a man cannot just lie down in his blankets to sleep, or he would be covered by sand before he woke. Most of that desert can be likened to the giant tray of a giant fardarbab tomorrow-teller. It is a flat expanse of smooth, dun-colored sand, a sand so fine that it flows through one’s fingers like water. In the intervals between winds, that sand lies as virginally unmarked as the sand in the tomorrow-teller’s tray. So fine and so smooth is it that the least passing insect—a centipede, a grasshopper, a scorpion—leaves a trail visible from afar. A man could, if he got bored enough by the tedium of desert traveling, find distraction by following the meandering track of a single ant.

However, in the daytime, it was seldom that a wind was not blowing, stirring that sand and picking it up and carrying it and throwing it. Since the winds of the Dasht-e-Kavir blow always from the same direction, from the southwest, it is easy to tell in which direction a stranger is traveling—even if you meet him camped and immobile—simply by seeing which flank of his mount is the most heavily coated with blown sand. In the nighttime, the desert wind drops, and lets drop from the air the heavier particles of sand. But the finer particles hang in the air like dust, and hang there so densely as to constitute a dry fog. It blots out whatever stars there may be in the sky, sometimes obscures even a full moon. In the combined darkness and fogginess, one’s vision may be limited to just a few arm-lengths. Nostril told us that there were creatures called Karauna which took advantage of that dark fog—according to Persian folk legend the Karauna create it, said Nostril, by some dark magic—in which to do dark deeds. More usually, the chief danger of that fog is that the suspended dust sifts imperceptibly down from the air during the stillness of night, and a traveler not sheltered under a tent could be quietly, stealthily buried and smothered to death in his sleep.

We had still the greater part of Persia to cross, but it was the empty part—perhaps the emptiest part of the entire world—and we did not meet a single Persian along our way, or much of anything else, or see in the sand the tracks of anything larger than insects. In other regions of Persia, similarly unoccupied and uncultivated by man, we journeyers might have had to be on our guard against predatory prides of lions, or scavenging packs of shaqàl dogs, or even flocks of the big flightless shuturmurq camel-birds, which, we had been told, can disembowel a man with a kick. But none of those hazards had to be feared in the desert, for no wild thing lives in it. We saw an occasional vulture or kite, but they stayed high in the windy sky above and did not tarry in their passing. Even vegetable plants seem to shun that desert. The only green thing I saw growing there was a low shrub with thick and fleshy-looking leaves.

“Euphorbia,” Nostril said it was. “And it grows here only because Allah put it here to be a help to the journeyer. In the hot season, the euphorbia’s seed pods grow ripe and burst and fling out their seeds. They begin to pop when the desert air gets exactly as hot as a human’s blood. Then the pods burst with increasing frequency as the air gets even hotter. So a desert wanderer can tell, by listening to the loudness of the popping of the euphorbia, when the air is getting so perilously hot that he must stop and put up a shelter for shade, or he will die.”

That slave, for all his squalid person and sexual erethism and detestable character, was an experienced traveler, and told us or showed us many things of use or interest. For example, on our very first night in that wasteland, when we stopped to camp, he got down from his camel and stuck his prodding pole into the sand, pointed in the direction we were going.

“It may be needful in the morning,” he explained. “We have determined to go always toward the spot where the sun rises. But if the sand is blowing at that hour, we may not be able otherwise to fix on the spot.”

The treacherous sands of the Dasht-e-Kavir are not its only menace to man. That name, as I have said, means the Great Salt Desert, and for a reason. Vast extents of it are not of sand at all; they are immense reaches of a salty paste, not quite wet enough to be called mud or marsh, and the wind and sun have dried the paste to a surface of caked solid salt. Often a traveler must cross one of those glittering, crunching, quivering, blindingly white salt crusts, and he must do it gingerly. The salt crystals are more abrasive than sand; even a camel’s callused pads can quickly be worn to bleeding rawness, and, if the rider has to dismount, his boots can be likewise shredded, and then his feet. Also, the salt surfaces are of uneven thickness, making of those areas what Nostril called “the trembling lands.” Sometimes the weight of a camel or a man will break through the crust. If that happens, the animal or the man falls into the pasty muck beneath. From that salt quicksand it is impossible to climb out unaided, or even to stay put and wait for help to come. It slowly but ineluctably draws down whatever falls into it, and sucks the fallen creature under the surface, and closes over it. Unless a rescuer is nearby, and on firmer ground, the unfortunate fallen one is doomed. According to Nostril, entire karwan trains of men and animals have thus disappeared and left no trace.

So, when we came to the first of those salt flats, though it looked as innocuous as a layer of hoarfrost unseasonably on the ground, we halted and studied it with respect. The white crust gleamed out before us, clear to the skyline, and away as far as we could see to either side.

“We could try going around,” said my father.

“The maps of the Kitab show no such details as this,” said my uncle, scratching meditatively at his elbow. “We have no way of knowing its extent, or of guessing whether a north or a south detour would be shorter.”

“And if we are going to skirt every one of these,” said Nostril, “we will be in this desert forever.”

I said nothing, being totally ignorant of desert travel, and not ashamed to leave the decisions to the more expert. So we four sat our camels and looked out over the sparkling waste. But the boy Aziz, behind us, prodded his pack camel and made it kneel, and he dismounted. We did not notice what he was doing until he walked out from among us and walked onto the salt crust. He turned and looked up at us, and smiled prettily, and said in his little bird voice: