Daglish, a young, spirited, and handsome cavalry officer, dropped his glasses and let them dangle about his neck, while he turned impatiently towards Geoff. "See!" he cried, stretching his hand out. "Look for yourself, Keith; there's the village yonder and hundreds of palm-trees round it; but it can't have sprung up in a moment, and can't have taken the place of those horsemen. What's it mean?" The line the officers' patrol had taken had brought them to a low elevation--for though the estuary of the Tigris and the Euphrates is more or less flat, and the greater part of it but desert country, the ground rises here and there almost imperceptibly into hard gravel patches, and it was on the summit of one of these that the patrol had halted, and from which they had first sighted what was taken to be enemy horsemen, and which now, to the amazement of the officer, had developed into merely a native village. Pulling out his glasses, Geoff first of all surveyed the scene without their aid, and noticed that from the slight elevation to which they had attained he was able to look down upon the course of the river as it ran through a broad belt of green palm-trees. He could see stretches of the water flashing here and there under the brilliant rays of the sun. Elsewhere peeps of it only were obtainable, while in other parts the brilliant reflection from its surface shot through a thousand apertures between the trunks of the palms, the light almost dazzling him as it reached him. It was to a point, perhaps more than a mile away, and just outside the closest belt of palm-trees, that Daglish was pointing, and as Geoff looked in that direction he too saw a native village embowered in palms, its white houses gleaming faintly across the yellow stretches of desert. "Well?" Daglish asked him impatiently. Geoff smiled. "Just a mirage," he told his companion. "They are funny things till you get used to them, and you have to come and live in this country for quite a while often before you get a chance. Before now I've seen a whole Turkish city rise up before me out of the desert, looking wonderfully realistic, with people moving about, and horses, and asses, and dogs in all directions. Then I've gone on a little way, or gone back, and the whole scene has vanished. That's a mirage. Some trick of the sun's rays playing upon the atmosphere spread out over the desert. How it's brought about beats me altogether; but it's real enough when one sees it, and equally elusive when one's moved from one's position. Let's walk our horses across here to the left; we needn't trouble to go downhill at all, for if you have seen the enemy horsemen out there in the open, they will most distinctly have seen you up here on this little bit of an eminence."