For an hour after striking camp the professor did not build a lire, but sat looking up the shore of the lake through his hunting glass. It was dusk when he returned to where he had put up his tent and chained the dogs. For a few moments he stood unobserved, looking at the wolf-dog. Kazan was still uneasy. He lay facing the west. McGill made note of this, for the big Dane lay behind Kazan—to the east.

Behind a rock McGill built a very small fire, and prepared supper. After this he went into the tent, and when he came out he carried a blanket under his arm. He chuckled as he stood for a moment over Kazan.

"We're not going to sleep in there tonight, old boy," he said. "I don't like what you've found in the west wind." He laughed and buried himself in a clump of stunted Banksians thirty paces from the tent. Here he rolled himself in his blanket, and went to sleep.

It was a quiet, starlit night, and hours afterward Kazan dropped his nose between his forepaws and drowsed. It was the snap of a twig that roused him. The sound did not awaken the sluggish Dane, but instantly Kazan's head was alert, his keen nostrils sniffing the air. What he had smelled all day was heavy about him now.

Slowly, from out of the Banksians behind the tent, there came a figure. It was not that of the professor. It approached cautiously, with lowered head and hunched shoulders, and the starlight revealed the murderous face of Sandy McTrigger. Kazan crouched low. He laid his head flat between his forepaws. His long fangs gleamed. But he made no sound that betrayed his concealment under a thick Banksian shrub. Step by step Sandy approached, and at last he reached the flap of the tent. He did not carry a club or a whip in his hand now. In the place of either of those was the glitter of steel. At the door to the tent he paused, and peered in, his back to Kazan.

Silently, swiftly—the wolf now, in every movement—Kazan came to his feet. He forgot the chain that held him. Ten feet away stood the enemy he hated above all others he had ever known. Every ounce of strength in his splendid body gathered itself for the spring. And then he leaped. This time the chain did not pull him back, almost neck-broken. Age and the elements had weakened the leather collar he had worn since the days of his slavery in the traces, and it gave way with a snap. Sandy turned, and in a second leap Kazan's fangs sank into the flesh of his arm. With a startled cry the man fell, and as they rolled over on the ground the big Dane's deep voice rolled out in thunderous alarm.

In the fall Kazan's hold was broken. In an instant he was on his feet, ready for another attack. And then the change came. He was free. The collar was gone from his neck. The forest, the stars, the whispering wind were all about him. Here were men, and off there was—Gray Wolf! His ears dropped, and he turned swiftly, and slipped like a shadow back into the glorious freedom of his world.

A hundred yards away something stopped him for an instant. It was not the big Dane's voice, but the sharp crack—crack—crack of the little professor's automatic. And above that sound there rose the voice of Sandy McTrigger in a weird and terrible cry.

II

Mile after mile Kazan went on. For a time he was oppressed by the shivering note of death that had come to him in Sandy McTrigger's cry, and he slipped through the Banksians like a shadow, his ears flattened, his tail trailing, his hind quarters betraying that curious slinking quality of the wolf and dog stealing away from danger. Then he came out upon a plain, and the stillness, the billion stars in the clear vault of the sky, and the keen air that carried with it a breath of the Arctic barrens brought him alert and questing. He faced in the direction of the wind. Somewhere off there, far to the south and west, was Gray Wolf. For the first time in many weeks he sat back on his haunches and gave the deep and vibrant call that echoed weirdly for miles about him. Back in the Banksians the big Dane heard it, and whined. From over the still body of Sandy McTrigger the little professor looked up with a white, tense face, and listened for a second cry.