Here the wild beast scent was somewhat more rank than from the entrance. Yet here too it was stale. To all appearances this was the lair of some brute or brutes that used it only as a winter-time shelter. The fact did not interest Treve. He had come in here, hoping the opening might go all the way through the ledge and let him and the sheep out at the other side. As it did not, he went back to his wethers; rounded them up from their grass-munching and set them in motion, still skirting the ledge in the same direction. A few rods farther, the cliff was broken again; this time by a spring that trickled out from a rent in the precipice and filled a little natural rock pool in the ground in front of it. Another half-mile brought them within sound of rushing water, again; and they emerged on the bank of the little Pico River,--as swollen and as turbulent as the Chiquita itself and as impassable. Both tiny rivers had their birth on the summit. Both flowed down, on opposite sides of the cliff which extended from one to the other. The two streams converged a mile below. The sight of this new obstacle roused Treve to worried activity. Once more deserting his flock, he set off at a loping run, downhill, skirting the Pico. And at the end of a mile he came on the seething confluence of the two rivers. Thence he traced the Chiquita back to the ledge; after which, perplexedly, he ran on and rejoined the sheep. To his collie mind, one thing was clear. Until the waters should subside, there was no possibility of leading his wethers out of this enclosure. Here they must stay; and here he must look after them. It would have been the simplest sort of exploit for him to swim the river himself and get back to his master. But this would involve deserting the sheep;--which is the first and the most sacred “Thou Shalt Not” in all a trained sheep dog’s list of commandments. Having been wholly out of earshot from the trail, Treve did not hear the shouts of Fenno and later, of Royce. Mack, following the path of the strays, on his return, two days later, saw where it had approached the brook and then where part of it had branched off again, back toward the trail. Hence, he missed the one chance of finding his chum. He knew no sheep would swim the flooded river. The bridging log was gone. Thus, he did not explore beyond the Chiquita. The tally at the ranch proved the flock to be forty-eight sheep short. Both partners came to the somewhat natural conclusion that these must have encountered a group of cattlemen, rounding up their herds on the no-sheep section of the peak; and that the cowboys had destroyed them and their guardian collie. Such reprisals were not unprecedented in the eternal sheepman-cattleman war.