in their bones from exposure. Twenty-four hours had passed since they had tasted food, and their unreplenished systems complained. There is no better engine in the wide world than the human body. It will stand more neglect and abuse than the finest steel motors ever made by the hands of European craftsmen. A man may fast many days if he lies quietly in one place and keeps warm. But fasting is a deadly proposition while pulling sledges over the snow.
Dan was less hopeful now. His face told what his words did not. The lines cleft deeper about his lips and eyes; and Snowbird's heart ached when he tried to encourage her with a smile. It was a wan, strange smile that could n't quite hide the first sickness of despair.
The shadows quickly lengthened—simply leaping over the snow from the fast-falling sun. Soon it dropped down behind the ridge; and the gray of twilight began to deepen among the more distant trees. It blurred the outline and dulled the sight. With the twilight came the cold, first crisp, then bitter and penetrating to the vitals. The twilight deepened, the snow turned gray, and then, in a vague way, the journey began to partake of a quality of unreality. It was not that the cold and the snow
