There is an ecstasy that marks the summit of life, and beyond which life cannot rise. And such is the paradox of living, this ecstasy comes when one is most alive, and it comes as a complete forgetfulness that one is alive. This ecstasy, this forgetfulness of living, comes to the artist, caught up and out of himself in a sheet of flame; it comes to the soldier, war–mad on a stricken field and refusing quarter; and it came to Buck, leading the pack, sounding the old wolf–cry, straining after the food that was alive and that fled swiftly before him through the moonlight. He was sounding the deeps of his nature, and of the parts of his nature that were deeper than he, going back into the womb of Time. He was mastered by the sheer surging of life, the tidal wave of being, the perfect joy of each separate muscle, joint, and sinew in that it was everything that was not death, that it was aglow and rampant, expressing itself in movement, flying exultantly under the stars and over the face of dead matter that did not move.

But Spitz, cold and calculating even in his supreme moods, left the pack and cut across a narrow neck of land where the creek made a long bend around. Buck did not know of this, and as he rounded the bend, the frost wraith of a rabbit still flitting before him, he saw another and larger frost wraith leap from the overhanging bank into the immediate path of the rabbit. It was Spitz. The rabbit could not turn, and as the white teeth broke its back in mid air it shrieked as loudly as a stricken man may shriek. At sound of this, the cry of Life plunging down from Life's apex in the grip of Death, the fall pack at Buck's heels raised a hell's chorus of delight.

Buck did not cry out. He did not check himself, but drove in upon Spitz, shoulder to shoulder, so hard that he missed the throat. They rolled over and over in the powdery snow. Spitz gained his feet almost as though he had not been overthrown, slashing Buck down the shoulder and leaping clear. Twice his teeth clipped together, like the steel jaws of a trap, as he backed away for better footing, with lean and lifting lips that writhed and snarled.

"Nevaire such a dog as dat Buck!" he cried. "No, nevaire! Heem worth one t'ousan' dollair, by Gar! Eh? Wot you say, Perrault?"

And Perrault nodded. He was ahead of the record then, and gaining day by day. The trail was in excellent condition, well packed and hard, and there was no new–fallen snow with which to contend. It was not too cold. The temperature dropped to fifty below zero and remained there the whole trip. The men rode and ran by turn, and the dogs were kept on the jump, with but infrequent stoppages.

The Thirty Mile River was comparatively coated with ice, and they covered in one day going out what had taken them ten days coming in. In one run they made a sixty–mile dash from the foot of Lake Le Barge to the White Horse Rapids. Across Marsh, Tagish, and Bennett (seventy miles of lakes), they flew so fast that the man whose turn it was to run towed behind the sled at the end of a rope. And on the last night of the second week they topped White Pass and dropped down the sea slope with the lights of Skaguay and of the shipping at their feet.

It was a record run. Each day for fourteen days they had averaged forty miles. For three days Perrault and Francois threw chests up and down the main street of Skaguay and were deluged with invitations to drink, while the team was the constant centre of a worshipful crowd of dog–busters and mushers. Then three or four western bad men aspired to clean out the town, were riddled like pepper–boxes for their pains, and public interest turned to other idols. Next came official orders. Francois called Buck to him, threw his arms around him, wept over him. And that was the last of Francois and Perrault. Like other men, they passed out of Buck's life for good.

Thirty days from the time it left Dawson, the Salt Water Mail, with Buck and his mates at the fore, arrived at Skaguay. They were in a wretched state, worn out and worn down. Buck's one hundred and forty pounds had dwindled to one hundred and fifteen. The rest of his mates, though lighter dogs, had relatively lost more weight than he. Pike, the malingerer, who, in his lifetime of deceit, had often successfully feigned a hurt leg, was now limping in earnest. Sol–leks was limping, and Dub was suffering from a wrenched shoulder–blade.

They were all terribly footsore. No spring or rebound was left in them. Their feet fell heavily on the trail, jarring their bodies and doubling the fatigue of a day's travel. There was nothing the matter with them except that they were dead tired. It was not the dead–tiredness that comes through brief and excessive effort, from which recovery is a matter of hours; but it was the dead–tiredness that comes through the slow and prolonged strength drainage of months of toil. There was no power of recuperation left, no reserve strength to call upon. It had been all used, the last least bit of it. Every muscle, every fibre, every cell, was tired, dead tired. And there was reason for it. In less than five months they had travelled twenty–five hundred miles, during the last eighteen hundred of which they had had but five days' rest. When they arrived at Skaguay they were apparently on their last legs. They could barely keep the traces taut, and on the down grades just managed to keep out of the way of the sled.

"Mush on, poor sore feets," the driver encouraged them as they tottered down the main street of Skaguay. "Dis is de las'. Den we get one long res'. Eh? For sure. One bully long res'."

"That settles it," he announced. "We camp right here." And camp they did, till Buck's ribs knitted and he was able to travel.

That winter, at Dawson, Buck performed another exploit, not so heroic, perhaps, but one that put his name many notches higher on the totem–pole of Alaskan fame. This exploit was particularly gratifying to the three men; for they stood in need of the outfit which it furnished, and were enabled to make a long–desired trip into the virgin East, where miners had not yet appeared. It was brought about by a conversation in the Eldorado Saloon, in which men waxed boastful of their favorite dogs. Buck, because of his record, was the target for these men, and Thornton was driven stoutly to defend him. At the end of half an hour one man stated that his dog could start a sled with five hundred pounds and walk off with it; a second bragged six hundred for his dog; and a third, seven hundred.

"Pooh! pooh!" said John Thornton; "Buck can start a thousand pounds."

"And break it out? and walk off with it for a hundred yards?" demanded Matthewson, a Bonanza King, he of the seven hundred vaunt.

"And break it out, and walk off with it for a hundred yards," John Thornton said coolly.

"Well," Matthewson said, slowly and deliberately, so that all could hear, "I've got a thousand dollars that says he can't. And there it is." So saying, he slammed a sack of gold dust of the size of a bologna sausage down upon the bar.

And so well did he face it, that at the end of half an hour the wolves drew back discomfited. The tongues of all were out and lolling, the white fangs showing cruelly white in the moonlight. Some were lying down with heads raised and ears pricked forward; others stood on their feet, watching him; and still others were lapping water from the pool. One wolf, long and lean and gray, advanced cautiously, in a friendly manner, and Buck recognized the wild brother with whom he had run for a night and a day. He was whining softly, and, as Buck whined, they touched noses.

Then an old wolf, gaunt and battle–scarred, came forward. Buck writhed his lips into the preliminary of a snarl, but sniffed noses with him, Whereupon the old wolf sat down, pointed nose at the moon, and broke out the long wolf howl. The others sat down and howled. And now the call came to Buck in unmistakable accents. He, too, sat down and howled. This over, he came out of his angle and the pack crowded around him, sniffing in half–friendly, half–savage manner. The leaders lifted the yelp of the pack and sprang away into the woods. The wolves swung in behind, yelping in chorus. And Buck ran with them, side by side with the wild brother, yelping as he ran.

The next he knew, he was dimly aware that his tongue was hurting and that he was being jolted along in some kind of a conveyance. The hoarse shriek of a locomotive whistling a crossing told him where he was. He had travelled too often with the Judge not to know the sensation of riding in a baggage car. He opened his eyes, and into them came the unbridled anger of a kidnapped king. The man sprang for his throat, but Buck was too quick for him. His jaws closed on the hand, nor did they relax till his senses were choked out of him once more.

"Yep, has fits," the man said, hiding his mangled hand from the baggageman, who had been attracted by the sounds of struggle. "I'm takin' 'm up for the boss to 'Frisco. A crack dog–doctor there thinks that he can cure 'm."

Concerning that night's ride, the man spoke most eloquently for himself, in a little shed back of a saloon on the San Francisco water front.

"All I get is fifty for it," he grumbled; "an' I wouldn't do it over for a thousand, cold cash."

His hand was wrapped in a bloody handkerchief, and the right trouser leg was ripped from knee to ankle.