Panting from his stupendous efforts, Treve started at a canter along the far bank of the stream, toward the forty-seven wethers that had crossed in safety. His sole duty, now, was toward them; and he realized it. He must get them back to the other side of the river and thence down to the main flock, a mile below.

The sheep had been grievously affrighted by the splash of the log and by the mishap to their fellow-imbecile. They were scattering, with loud bleats, through the rock-strewn underbrush. But they did not scatter far. After them, in front of them, on every side of them, swept a golden-tawny and loud-mouthed whirlwind; that gave them no peace until they consented to turn back from their four-direction flight and bunch themselves as he decreed.

Then, his strays rounded up and submissive, Treve undertook to get them out of their predicament. But this was a task beyond his collie brain. He did not seek to drive them across the tossing little river. The death of the one sheep that had fallen into the flood told him the futility of such a move;—even could he have forced them to the terrifying passage. He must find some better way to get back to the flock.

The river, in its descent, waxed ever wider. Moreover, its course continued steadily to travel farther and farther from the trail. Perhaps for this reason, perhaps by mere instinct, Treve began to drive his scared sheep up the mountain; keeping ever as near as possible to the stream; and watching for a safe way to cross. Again and again he tested its bottom in hope of a ford. But he found none. Nor was the river bridged, farther up, by any tree.

Still, he continued his climb, marshaling the forty-seven wethers ahead of him. The going was rough and the sheep were tired and rebellious. But he kept on. At the end of a few minutes he stopped. Or rather, he was stopped. He was stopped by the same form of barrier as had halted the sheep, in the first place, on the other side of the stream, far below.

A rock ridge, some twelve feet high, and with a front as precipitous as the wall of a room, loomed in front of him and his flock. It continued to the very edge of the stream and indeed for a yard or two out into the water; the current foaming around its base. There was no way of climbing it. Treve must needs follow, to the right along its base, for an opportunity to skirt it or else to surmount it at some place where the cliff should be lower and less precipitate.

So, to the right, he guided his weary captives and moved along the ridge’s base. Presently, the roar of the Chiquita River died away behind them as they pushed forward through the rubble and thickets that fringed the bottom of the cliff. Nowhere did the cliff itself appear to be lower. Instead, it seemed to be sloping upward, gradually, to greater height.

The sheep became harder to drive. For hereabouts were wide clearings in the forest and underbrush. These clearings were lush with grass. Here, no flock had grazed; the herdsmen wisely sticking to the other side of the Chiquita. But Treve would not let the wethers loiter. The day was growing late, and the journey to the flock below was momentarily waxing greater.

Only once did the collie check his steady drive. That was when the front of the cliff opened wide in a split that had had its origin in some ancient earthquake. Here was an aperture, some six feet wide; the cliff-top meeting above it in a sort of Gothic arch, formed by the toppling of two crest bowlders against each other, long ago.

Leaving his fagged-out sheep to browse on the grass, Treve explored this opening. Warily, he advanced into it. For his nostrils registered the scent of wild beasts here. But, as the scent was old and stale, he did not hesitate to continue.