The cub was rolling and pitching about in his pannier like a raw amateur in a howdab on an elephant's back, and after contemplating him for a few moments Langdon caught up with Bruce again. Half a dozen times during the next two or three hours he visited Muskwa, and each time that he returned to Bruce he was quieter, as if debating something with himself. It was nine o'clock when they came to what was undoubtedly the end of Thor's valley. A mountain rose up squarely in the face of it, and the stream they were following swung sharply to the westward into a narrow canyon. On the east rose a green and undulating slope up which the horses could easily travel, and which would take the outfit into a new valley in the direction of the Driftwood. This course Bruce decided to pursue. Halfway up the slope they stopped to give the horses a breathing spell. In his cowhide prison Muskwa whimpered pleadingly. Langdon heard, but he seemed to pay no attention. He was looking steadily back into the valley. It was glorious in the morning sun. He could see the peaks under which lay the cool, dark lake in which Thor had fished; for miles the slopes were like green velvet and there came to him as he looked the last droning music of Thor's world. It struck him in a curious way as a sort of anthem, a hymnal rejoicing that he was going, and that he was leaving things as they were before he came. And yet, _was_ he leaving things as they had been? Did his ears not catch in that music of the mountains something of sadness, of grief, of plaintive prayer? And again, close to him, Muskwa whimpered softly. Then Langdon turned to Bruce. "It's settled," he said, and his words had a decisive ring in them. "I've been trying to make up my mind all the morning, and it's made up now. You and Metoosin go on when the horses get their wind. I'm going to ride down there a mile or so and free the cub where he'll find his way back home!" He did not wait for arguments or remarks, and Bruce made none. He took Muskwa in his arms and rode back into the south. A mile up the valley Langdon came to a wide, open meadow dotted with clumps of spruce and willows and sweet with the perfume of flowers. Here he dismounted, and for ten minutes sat on the ground with Muskwa. From his pocket he drew forth a small paper bag and fed the cub its last sugar. A thick lump grew in his throat as Muskwa's soft little nose muzzled the palm of his hand, and when at last he jumped up and sprang into his saddle there was a mist in his eyes. He tried to laugh. Perhaps he was weak. But he loved Muskwa, and he knew that he was leaving more than a human friend in this mountain valley. "Good-bye, old fellow," he said, and his voice was choking. "Good-bye, little Spitfire! Mebby some day I'll come back and see you, and you'll be a big, fierce bear--but I won't shoot--never--never--"