The sound of a new bird came from the pines above--the hoot of an owl--and was answered from some other part of the wood. This they did not particularly notice at first, but soon they heard the same note, unexpectedly distant, like an echo. The game trail, now quite a defined path beside the river, showed no sign of changing its course or fading out into blank ground, as these uncertain guides do so often. It led consistently in the desired direction, and the two men were relieved to see it continue. Not only were the runaways easier to keep track of, but better speed was made along this valley. The pervading imminence of night more and more dispelled the lingering afternoon, though there was yet no twilight in the open, and the high peaks opposite shone yellow in the invisible sun. But now the owls hooted again. Their music had something in it that caused both the Virginian and Balaam to look up at the pines and wish that this valley would end. Perhaps it was early for night-birds to begin; or perhaps it was that the sound never seemed to fall behind, but moved abreast of them among the trees above, as they rode on without pause down below; some influence made the faces of the travellers grave. The spell of evil which the sight of the wheeling buzzard had begun, deepened as evening grew, while ever and again along the creek the singular call and answer of the owls wandered among the darkness of the trees not far away. The sun was gone from the peaks when at length the other side of the stream opened into a long wide meadow. The trail they followed, after crossing a flat willow thicket by the water, ran into dense pines, that here for the first time reached all the way down to the water’s edge. The two men came out of the willows, and saw ahead the capricious runaways leave the bottom and go up the hill and enter the wood. “We must hinder that,” said the Virginian; and he dropped Pedro’s rope. “There’s your six-shooter. You keep the trail, and camp down there”--he pointed to where the trees came to the water--“till I head them hawsses off. I may not get back right away.” He galloped up the open hill and went into the pine, choosing a place above where the vagrants had disappeared.