They were flying, getting over the ground, making the most of the packed trail. Later on they would come to the unbroken trail, where three miles an hour would constitute good going. Then there would be no riding and resting, and no running. Then the gee-pole would be the easier task, and a man would come back to it to rest after having completed his spell to the fore, breaking trail with the snowshoes for the dogs. Such work was far from exhilarating also, they must expect places where for miles at a time they must toil over chaotic ice-jams, where they would be fortunate if they made two miles an hour. And there would be the inevitable bad jams, short ones, it was true, but so bad that a mile an hour would require terrific effort. Kama and Daylight did not talk. In the nature of the work they could not, nor in their own natures were they given to talking while they worked. At rare intervals, when necessary, they addressed each other in monosyllables, Kama, for the most part, contenting himself with grunts. Occasionally a dog whined or snarled, but in the main the team kept silent. Only could be heard the sharp, jarring grate of the steel runners over the hard surface and the creak of the straining sled. As if through a wall, Daylight had passed from the hum and roar of the Tivoli into another world--a world of silence and immobility. Nothing stirred. The Yukon slept under a coat of ice three feet thick. No breath of wind blew. Nor did the sap move in the hearts of the spruce trees that forested the river banks on either hand. The trees, burdened with the last infinitesimal pennyweight of snow their branches could hold, stood in absolute petrifaction. The slightest tremor would have dislodged the snow, and no snow was dislodged. The sled was the one point of life and motion in the midst of the solemn quietude, and the harsh churn of its runners but emphasized the silence through which it moved.