The Yellow Knives were breaking camp, and the hunters were at once conscious of the difference in their bearing. Rea addressed several braves, but got no reply. He laid his broad hand on the old wrinkled chief, who repulsed him, and turned his back. With a growl, the trapper spun the Indian round, and spoke as many words of the language as he knew. He got a cold response, which ended in the ragged old chief starting up, stretching a long, dark arm northward, and with eyes fixed in fanatical subjection, shouting: "Naza! Naza! Naza!" "Heathen!" Rea shook his gun in the faces of the messengers. "It'll go bad with you to come Nazain' any longer on our trail. Come, Buff, clear out before I get mad." When they were once more in the cabin, Rea told Jones that the messengers had been sent to warn the Yellow Knives not to aid the white hunters in any way. That night the dogs were kept inside, and the men took turns in watching. Morning showed a broad trail southward. And with the going of the Yellow Knives the mercury dropped to fifty, and the long, twilight winter night fell. So with this agreeable riddance and plenty of meat and fuel to cheer them, the hunters sat down in their snug cabin to wait many months for daylight. Those few intervals when the wind did not blow were the only times Rea and Jones got out of doors. To the plainsman, new to the north, the dim gray world about him was of exceeding interest. Out of the twilight shone a wan, round, lusterless ring that Rea said was the sun. The silence and desolation were heart-numbing. "Where are the wolves?" asked Jones of Rea. "Wolves can't live on snow. They're farther south after caribou, or farther north after musk-ox." In those few still intervals Jones remained out as long as he dared, with the mercury sinking to -sixty degrees. He turned from the wonder of the unreal, remote sun, to the marvel in the north—Aurora borealis—ever-present, ever-changing, ever-beautiful! and he gazed in rapt attention. "Polar lights," said Rea, as if he were speaking of biscuits. "You'll freeze. It's gettin' cold." Cold it became, to the matter of -seventy degrees. Frost covered the walls of the cabin and the roof, except just over the fire. The reindeer were harder than iron. A knife or an ax or a steel-trap burned as if it had been heated in fire, and stuck to the hand. The hunters experienced trouble in breathing; the air hurt their lungs. The months dragged. Rea grew more silent day by day, and as he sat before the fire his wide shoulders sagged lower and lower. Jones, unaccustomed to the waiting, the restraint, the barrier of the north, worked on guns, sleds, harness, till he felt he would go mad. Then to save his mind he constructed a windmill of caribou hides and pondered over it trying to invent, to put into practical use an idea he had once conceived.