In the first, mysterious, glassy grey of dawn, when thin wisps of vapour clung curling among the grass-tops, the two wanderers got up and fell to grazing. Then Star, who was beginning to feel homesick for old pasture fields, strayed away irresolutely toward the road for home. Buck, however, would have none of it. He marched off toward the brook, splashed through, and fell to pasturing again on the farther side. Star, not enduring to be left alone, immediately joined him.

That day the pair pressed onward, deeper and deeper into the wilds, Buck ever eager on the unknown quest, Star ever reluctant, but persuaded. As a matter of fact, had Star been resolute enough in his reluctance, had he had the independence to lie down and refuse to go farther, he would have gained the day, for Buck would never have forsaken him. But initiative ruled inertia, as is usually the case, and Buck's adventuring spirit had its way.

It was a rugged land, but hospitable enough to the wanderers in this affluent late June weather, through which Buck so confidently led the way. The giant tangle of the forest was broken by frequent wild meadows, and foaming streams, and lonely little granite-bordered lakes, and stretches of sun-steeped barren, all bronze green with blueberry scrub. There was plenty to eat, plenty to drink, and when the flies and the heat grew troublesome, it was pleasant to wallow in the cold, amber-brown pools. Even Star began to forget the home pasture, and content himself with the freedom which he had never craved.

How far and to what goal the urge in Buck's untamed heart would have carried them before exhausting itself, there is no telling. But he had challenged without knowledge the old, implacable sphinx of the wilderness. And suddenly, to his undoing, the challenge was accepted.

On the third day of their wanderings the pair came out upon a river too deep and wide for even Buck's daring to attempt to cross. The banks were steep—a succession of rocky bluffs, broken by deep lateral bayous, and strips of interval meadows where brooks came in through a fringe of reeds and alders. Buck turned northward, following the bank up stream, sometimes close to the edge, sometimes a little way back, wheresoever the easier path or the most tempting patches of pasturage might seem to lead. He was searching always for some feasible crossing, for his instinct led him always to get over any barrier. That his path toward the west had been barred only confirmed him in his impulse to work westward.

Late that afternoon, as they burst out, through thick bushes, into a little grassy glade, they surprised a bear-cub playing with a big yellow fungus, which he boxed and cuffed about—carefully, so as not to break his plaything—as a kitten boxes a ball. To Buck, of course, the playful cub was only another dog, which might be expected to come yapping and snapping at his heels. With an indignant snort he charged it.

The cub, at that ominous sound, looked up in astonishment. But when he saw the terrible red form dashing down upon him across the grass, he gave a squeal of terror and fled for the shelter of the trees. He was too young, however, for any great speed or agility, and he had none of the dog's artfulness in dodging. Before he could gain cover he was overtaken. Buck's massive front caught him on his haunches, smashing him into the ground. He gave one agonized squall, and then the life was crushed out of him.

Amazed at this easy success—the first of the kind he had ever had—but immensely proud of himself, the great red ox drew off and eyed his victim for a second or two, his tail lashing his sides in angry triumph. Then he fell to goring the small black body, and tossing it into the air, and battering it again with his forehead as it came down. He was taking deep vengeance for all the yelping curs which had worried and eluded him in the past.

In the midst of this congenial exercise he caught sight, out of the corner of his eye, of a big black shape just hurling itself upon him. The mother bear, a giant of her kind, had come to the cry of her little one.

Buck whirled with amazing nimbleness to meet the attack. He was in time to escape the blow which would have cracked even his mighty neck, but the long, steel-hard claws of his assailant fairly raked off one side of his face, destroying one eye completely. At the same time, with a shrill bellow, he lunged forward, driving a short, punishing horn deep into the bear's chest and hurling her back upon her haunches.