Even in the darkest night, there is one light that never brings hope or cannot lead. It is not a twinkling, joyous light like that mysterious will-o'-the-wisp that now and again has lured travelers into the marshes to their death. Nor can any one ever mistake it, or be soothed and cheered by it. It always appears the same way,—two green circles, close together, in the darkness.

When Snowbird first heard the step in the thickets beside her, she halted bravely and held her lantern high. She understood at last. The very extremity of the beams found a reflection in two very curious circles of greenish fire: a fire that was old upon the world before man ever rubbed two sticks together to strike a flame. Of course the dim rays had simply been reflected on the eyes of some great beast of prey.

She identified it at once. Only the eyes of the felines, with vertical pupils, have this identical greenish glare. The eyes of the wolves glow in the darkness, but the circles are usually just bright points. Of course it was a cougar.

She didn't cry out again. Realizing at last the reality of her peril, her long training in the mountains came to her aid. That did not mean she was not truly and terribly afraid. The sight of the eyes of a hunting animal in the darkness calls up memories from the germ-plasm,—deep-buried horrors of thousands of generations past, when such lights glowed all about the mouth of the cave. Besides, the beast was hunting her. She couldn't doubt this fact. Curiosity might make a lion follow her, but it would never beget such a wild light of madness in his eyes as this she had just seen. Only the frenzied pulse of wild blood through the fine vessels of the corneas could occasion such a glow as this. She simply clamped down all her moral strength on her rising hysteria and looked her situation in the face. Her hand flew instinctively to her side, and the pistol leaped in the lantern light.

But the eyes had already blinked out before she could raise the weapon. She shot twice. The echoes roared back, unbelievably loud in the silence, and then abruptly died; and the only sound was a rustling of leaves as the cougar crouched. She sobbed once, then hurried on.

She was afraid to listen at first. She wanted to believe that her pistol fire would frighten the animal from her trail. She knew, under ordinary conditions, that it would. If he still followed, it could mean but one thing,—that some unheard-of incident had occurred to destroy his fear of men. It would mean that he had knowingly set upon her trail and was hunting her with all the age-old remorselessness that is the code of the mountains.

For a little while all was silence. Then out of the hush the thickets suddenly crashed and shook on the opposite side of the trail. She fired blindly into the thicket. Then she caught herself with a sob. But two shells remained in her pistol, and they must be saved for the test.

Whisperfoot the cougar, remembering the lessons of his youth, turned from the trail when he had first heard Snowbird's step. He had crouched and let her pass. She was walking into the wind; and as she was at the closest point a message had blown back to him.

The hair went straight on his shoulders and along his spine. His blood, running cold an instant before from fear, made a great leap in his veins. A picture came in his dark mind: the chase for a deer when the moon had set, the stir of a living thing that broke twigs in the thickets, and the leap he had made. There had been blood, that night,—the wildness and the madness and the exultation of the kill. Of course there had been terror first, but the terror had soon departed and left something lying warm and still in the thickets. It was the same game that walked his trail in front—game that died easily and yet, in a vague way he did not understand, the noblest game of all. It was living flesh, to tear with talon and fang.

All his training, all the instincts imbued in him by a thousand generations of cougars who knew this greatest fear, were simply obliterated by the sudden violence of his hunting-madness. He had tasted this blood once, and it could never be forgotten. The flame leaped in his eyes. And then he began the stalk.

A cougar, trying to creep silently on its game, does not move quickly. It simply steals, as a serpent steals through the grass. Whisperfoot stalked for a period of five minutes, to learn that the prey was farther away from him at every step.

He trotted forward until he came close, and again he stalked. Again he found, after a few minutes of silent creeping through the thickets, that he had lost distance. Evidently this game did not feed slowly, like the deer. It was to be a chase then. Again he trotted within one hundred feet of the girl.

Three times more he tried to stalk before he finally gave it up altogether. This game was like the porcupine,—simply to be chased down and taken. As in the case of all animals that hunt their game by overtaking it, there was no longer any occasion for going silently. The thing to do was to come close and spring from the trail behind.

Though the fear was mostly gone, the cougar retained enough of that caution that most wild animals exhibit when hunting a new game so that he didn't attempt to strike Snowbird down at once. But as the chase went on, his passion grew upon him. Ever he crept nearer. And at last he sprang full into the thickets beside her.

At that instant she had shot for the first time. Because the light had left his eyes before she could find aim, both shots had been clean misses. And terrible as the reports were, he was too engrossed in the chase to be frightened away by mere sound. This was the cry the man-pack always made,—these sudden, startling sounds in the silence. But he felt no pain. He crouched a moment, shivering. Then he bounded on again.

The third shot was a miss too: in fact, there had been no chance for a hit. A sound in the darkness is as unreliable a target as can possibly be imagined. And it didn't frighten him as much as the others.

Three times he crouched, preparing for a spring, and three times his tawny tail began that little up-and-down motion that is always the warning before his leap. But each time, as he waited to find his courage, the game had hurried on.

Now she had her back to a tree and was holding the lantern high. It glinted on his eyes. And the fourth time she shot, and something hot and strange singed by close to his head. But it wasn't the pain of one quill from a porcupine, and it only increased his anger. He waited, crouching, and the girl started on.

She was making other sounds now—queer, whimpering sounds not greatly different from the bleat that the fawn utters when it dies. It was a fear-sound, and if there is one emotion with which the wild beasts are acquainted, in all its phases, it is fear. She was afraid of him then, and that meant he need no longer be in the least afraid of her. His skin began to twitch all over with that terrible madness and passion of the flesh-hunters.

This game was like the deer, and the thing to do was lie in wait. There was only one trail. He was simply following his instincts, no conscious intelligence, when he made a long circle about her and turned back to the trail two hundred yards in front. He wasn't afraid of losing her in the darkness. She was neither fleet like the deer nor courageous like Woof, the bear. He had only to wait and leap from the darkness when she passed.

And because this was his own way of hunting, because the experiences of a thousand generations of cougars had taught him that it was the safest way, that even an elk may be downed by a surprise leap from ambush, the last of his fear went out of him. The step drew nearer, and he knew he would not again be afraid to give his stroke.

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When Dan Failing, riding like mad over the mountain trail, heard the third shot from Snowbird's pistol, he felt that one of the debts he owed had come due at last. He seemed to know, as the darkness pressed around him, that he was to be tried in the fire. And the horse staggered beneath him as he tried to hasten.

He showed no mercy to his mount. Horseflesh isn't made for carrying a heavy man over such a trail as this, and she was red-nostriled and lathered before half a mile had been covered. He made her leap up the rocks, and on the fairly level stretches he loosed the reins and lashed her into a gallop. Only a mountain horse could have stood that test. To Dan's eyes, the darkness was absolute; yet she kept straight to the trail. He made no attempt to guide her. She bounded over logs that he couldn't see, and followed turn after turn in the trail without ever a misstep.

He gave no thought to his own safety. His courage was at the test, and no risk of his own life must interfere with his attempt to save Snowbird from the danger that threatened her. He didn't know when the horse would fall with him and precipitate him down a precipice, and he was perfectly aware that to crash into a low-hanging limb of one of the great trees beside the trail would probably crush his skull. But he took the chance. And before the ride was done he found himself pleading with the horse, even as he lashed her sides with his whip.

The lesser forest creatures sprang from his trail; and once the mare leaped high to miss a dark shadow that crossed in front. As she caught her stride, Dan heard a squeal and a rattle of quills that identified the creature as a porcupine.

By now he had passed the first of the worst grades, coming out upon a long, easy slope of open forest. Again he urged his horse, leaving to her keen senses alone the choosing of the path between the great tree trunks. He rode almost in silence. The deep carpet of pine needles, wet from the recent rains, dulled the sound of the horse's hoofs.

Then he heard Snowbird fire for the fourth time; and he knew that he had almost overtaken her. The report seemed to smash the air. And he lashed his horse into the fastest run she knew,—a wild, sobbing figure in the darkness.

"She's only got one shot more," he said. He knew how many bullets her pistol carried; and the danger—whatever it was—must be just at hand. Underbrush cracked beneath him. And then the horse drew up with a jerk that almost hurled him from the saddle.

He lashed at her in vain. She was not afraid of the darkness and the rocks of the trail, but some Terror in the woods in front had in an instant broken his control over her. She reared, snorting; then danced in an impotent circle. Meanwhile, precious seconds were fleeing.

He understood now. The horse stood still, shivering beneath him, but would not advance a step. The silence deepened. Somewhere in the darkness before him a great cougar was waiting by the trail, and Snowbird, hoping for the moment that it had given up the chase, was hastening through the shadows squarely into its ambush.

Whisperfoot crouched lower: and again his long serpent of a tail began the little vertical motion that always precedes his leap. He had not forgotten the wild rapture of that moment he had inadvertently sprung on Landy Hildreth,—or how, after his terror had died, he had come creeping back. He hunted his own way, waiting on the trail; and his madness was at its height. He was not just Whisperfoot; the coward, that runs at the shadow of a tall form in the thickets. The consummation was complete, and that single experience of a month before had made of him a hunter of men. His muscles set for the leap.

So intent was he that his keen senses didn't detect the fact that there was a curious echo to the girl's footsteps. Dan Failing had slipped down from his terrified horse and was running up the trail behind her, praying that he could be in time.

Snowbird heard the pat, pat of his feet; but at first she did not dare to hope that aid had come to her. She had thought of Dan as on the far-away marshes; and her father, the only other living occupant of this part of the Divide, might even now be lying dead in his house. In her terror, she had lost all power of interpretation of events. The sound might be the cougar's mate, or even the wolf pack, jealous of his game. Sobbing, she hurried on into Whisperfoot's ambush.

Then she heard a voice, and it seemed to be calling to her. "Snowbird—I'm coming, Snowbird," a man's strong voice was shouting. She whirled with a sob of thankfulness.

At that instant the cougar sprang.

Terrified though she was, Snowbird's reflexes had kept sure and true. Even as the great cat leaped, a long, lithe shadow out of the shadow, her finger pressed back against the trigger of her pistol. She had been carrying her gun in front of her, and she fired it, this last time, with no conscious effort. It was just a last instinctive effort to defend herself.

One other element affected the issue. She had whirled to answer Dan's cry just as the cougar left the ground. But she had still been in range. The only effect was to lessen, in some degree, the accuracy of the spring. The bullet caught the beast in mid-air; but even if it had reached its heart, the momentum of the attack was too great to be completely overcome. Snowbird only knew that some vast, resistless power had struck her, and that the darkness seemed to roar and explode about her.

Hurled to her face in the trail, she did not see the cougar sprawl on the earth beside her. The flame in the lantern almost flicked out as it fell from her hand, then flashed up and down, from the deepest gloom to a vivid glare with something of the effect of lightning flickering in the sky. Nor did she hear the first frenzied thrashing of the wounded animal. Kindly unconsciousness had fallen, obscuring this and also the sight of the great cat, in the agony of its wound, creeping with broken shoulder and bared claws across the pine needles toward her defenseless body.

But the terrible fangs were never to know her white flesh. Some one had come between. There was no chance to shoot: Whisperfoot and the girl were too near together for that. But one course remained; and there was not even time to count the cost. In this most terrible moment of Dan Failing's life, there was not even an instant's hesitation. He did not know that Whisperfoot was wounded. He saw the beast creeping forward in the weird dancing light of the fallen lantern, and he only knew that his flesh, not hers, must resist its rending talons. Nothing else mattered. No other considerations could come between.

It was the test; and Dan's instincts prompted coolly and well. He leaped with all his strength. The cougar bounded into his arms, not upon the prone body of the girl. And she opened her eyes to hear a curious thrashing in the pine needles, a strange grim battle that, as the lantern flashed out, was hidden in the darkness.

And that battle, in the far reaches of the Divide, passed into a legend. It was the tale of how Dan Failing, his gun knocked from his hands as he met the cougar's leap, with his own unaided arms kept the life-giving breath from the animal's lungs and killed him in the pine needles. Claw and fang and the frenzy of death could not matter at all.

Thus Failing established before all men his right to the name he bore. And thus he paid one of his debts—life for a life, as the code of the forest has always decreed—and in the fire of danger and pain his metal was tried and proven.

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