Bo loved action. She had an eye for beauty, but she was not contemplative. She was now helping Dale drive the horses and hold them in rather close formation. She rode well, and as yet showed no symptoms of fatigue or pain. Helen began to be aware of both, but not enough yet to limit her interest. A wonderful forest without birds did not seem real to her. Of all living creatures in nature Helen liked birds best, and she knew many and could imitate the songs of a few. But here under the stately pines there were no birds. Squirrels, however, began to be seen here and there, and in the course of an hour's travel became abundant. The only one with which she was familiar was the chipmunk. All the others, from the slim bright blacks to the striped russets and the white-tailed grays, were totally new to her. They appeared tame and curious. The reds barked and scolded at the passing cavalcade; the blacks glided to some safe branch, there to watch; the grays paid no especial heed to this invasion of their domain. Once Dale, halting his horse, pointed with long arm, and Helen, following the direction, descried several gray deer standing in a glade, motionless, with long ears up. They made a wild and beautiful picture. Suddenly they bounded away with remarkable springy strides. The forest on the whole held to the level, open character, but there were swales and stream-beds breaking up its regular conformity. Toward noon, however, it gradually changed, a fact that Helen believed she might have observed sooner had she been more keen. The general lay of the land began to ascend, and the trees to grow denser. She made another discovery. Ever since she had entered the forest she had become aware of a fullness in her head and a something affecting her nostrils. She imagined, with regret, that she had taken cold. But presently her head cleared somewhat and she realized that the thick pine odor of the forest had clogged her nostrils as if with a sweet pitch. The smell was overpowering and disagreeable because of its strength. Also her throat and lungs seemed to burn.