An hour passed.  Sweat was breaking out in beads upon the faces of the Brothers, now miles apart, but both going in the same general direction over the endless wastes of snow, and upon their faces was beginning to creep the look of that pain that strong men unbeaten feel who see a beating in sight; but never for a moment did they slacken their swift, mysterious glide.

An hour passed.  Foam began to fleck the evilly up-lifted lips glistening back to the glistening fangs of the wolverines, now miles apart, but still heading in the same general line, and upon their faces began to set a look of fiends under torture; but never for a moment did they check their indescribable shuffling slouch.

After that all was a nightmare, blurred and horrible, in which endless processions of trees passed dimly, interspersed with aching blanks of dazzling white that blinded the starting eyes, and man and beast stumbled more than once as they sobbed along, forcing each leg forward by sheer will alone.

At last, on the summit of a hog-backed, bristling ridge, Gulo stopped and looked back, scowling and peering under his low brows.  Beneath him, far away, the valley lay like a white tablecloth, all dotted with green pawns, and the pawns were trees.  But he was not looking for them.  His keen eyes were searching for movement, and he saw it after a bit, a dot that crept, and crept, and crept, and—­stopped!

Gulo sat up, shading his eyes against the watery sun with his forepaws, watching as perhaps he had never watched in his life before.

For a long, long while, it seemed to him, that dot remained there motionless, far, far away down in the valley, and then at length, slowly, so slowly that at first the movement was not perceptible, it turned about and began to creep away—­creep, creep, creep away by the trail it had come.

Gulo watched it till it was out of sight, fading round a bend of the hills into a dark, dotted blur that was woods.  Then he dropped on all fours, and breathed one great, big, long, deep breath.  That dot was the one of the Brothers that had been hunting him.

And almost at the same moment, five miles away, his wife had just succeeded in swimming a swift and ice-choked river.  She was standing on the bank, watching another dot emerge into the lone landscape, and that dot was the other one of the Brothers.

They had failed to avenge the reindeer, and the wolverines were safe.  Safe?  Bah!  Wild creatures are never safe.  Nature knows better than that, since by safety comes degeneration.

There was a warning—­an instant’s rustling hissing in the air above—­less than an instant’s.  But that was all, and for the first time in his life—­perhaps because he was tired, fagged—­Gulo failed to take it.  And you must never fail to take a warning if you are a wild creature, you know!  There are no excuses in Nature.