ix hours long),
the young bulls retraced their steps more and more reluctantly to the
aid of their beset leader. The down-coming winter was harrying them
on to the lower levels, and it seemed they could never shake off this
tireless creature that held them back. Besides, it was not the life of
the herd, or of the young bulls, that was threatened. The life of only
one member was demanded, which was a remoter interest than their lives,
and in the end they were content to pay the toll.

As twilight fell the old bull stood with lowered head, watching his
mates--the cows he had known, the calves he had fathered, the bulls he
had mastered--as they shambled on at a rapid pace through the fading
light. He could not follow, for before his nose leaped the merciless
fanged terror that would not let him go. Three hundredweight more than
half a ton he weighed; he had lived a long, strong life, full of fight
and struggle, and at the end he faced death at the teeth of a creature
whose head did not reach beyond his great knuckled knees.

From then on, night and day, Buck never left his prey, never gave it a
moment's rest, never permitted it to browse the leaves of trees or
the shoots of young birch and willow. Nor did he give the wounded bull
opportunity to slake his burning thirst in the slender trickling streams
they crossed. Often, in desperation, he burst into long stretches of
flight. At such times Buck did not attempt to stay him, but loped easily
at his heels, satisfied with the way the game was played, lying down
when the moose stood still, attacking him fiercely when he strove to eat
or drink.

The great head drooped more and more under its tree of horns, and
the shambling trot grew weak and weaker. He took to standing for long
periods, with nose to the ground and dejected ears dropped limply; and
Buck found more time in which to get water for himself and in which to
rest. At such moments, panting with red lolling tongue and with eyes
fixed upon the big bull, it appeared to Buck that a change was coming
over the face of things. He could feel a new stir in the land. As the
moose were coming into the land, other kinds of life were coming in.
Forest and stream and air seemed palpitant with their presence. The news
of it was borne in upon him, not by sight, or sound, or smell, but by
some other and subtler sense. He heard nothing, saw nothing, yet knew
that the land was somehow different; that through it strange things were
afo