Dale turned away. Then the girls bade Roy good-by, and followed. Soon Roy and his buckskin-colored mustang were lost to sight round a clump of trees. The unhampered horses led the way; the pack-animals trotted after them; the riders were close behind. All traveled at a jog-trot. And this gait made the packs bob up and down and from side to side. The sun felt warm at Helen's back and the wind lost its frosty coldness, that almost appeared damp, for a dry, sweet fragrance. Dale drove up the shallow valley that showed timber on the levels above and a black border of timber some few miles ahead. It did not take long to reach the edge of the forest. Helen wondered why the big pines grew so far on that plain and no farther. Probably the growth had to do with snow, but, as the ground was level, she could not see why the edge of the woods should come just there. They rode into the forest. To Helen it seemed a strange, critical entrance into another world, which she was destined to know and to love. The pines were big, brown-barked, seamed, and knotted, with no typical conformation except a majesty and beauty. They grew far apart. Few small pines and little underbrush flourished beneath them. The floor of this forest appeared remarkable in that it consisted of patches of high silvery grass and wide brown areas of pine-needles. These manifestly were what Roy had meant by pine-mats. Here and there a fallen monarch lay riven or rotting. Helen was presently struck with the silence of the forest and the strange fact that the horses seldom made any sound at all, and when they did it was a cracking of dead twig or thud of hoof on log. Likewise she became aware of a springy nature of the ground. And then she saw that the pine-mats gave like rubber cushions under the hoofs of the horses, and after they had passed sprang back to place again, leaving no track. Helen could not see a sign of a trail they left behind. Indeed, it would take a sharp eye to follow Dale through that forest. This knowledge was infinitely comforting to Helen, and for the first time since the flight had begun she felt a lessening of the weight upon mind and heart. It left her free for some of the appreciation she might have had in this wonderful ride under happier circumstances. Bo, however, seemed too young, too wild, too intense to mind what the circumstances were. She responded to reality. Helen began to suspect that the girl would welcome any adventure, and Helen knew surely now that Bo was a true Auchincloss. For three long days Helen had felt a constraint with which heretofore she had been unfamiliar; for the last hours it had been submerged under dread. But it must be, she concluded, blood like her sister's, pounding at her veins to be set free to race and to burn.