scientific punishment, in a raging attempt to gather Brice once more into the trap of his terrible arms. But Gavin kept just out of reach, moving with an almost insolent carelessness, and ever flashing some painful blow to face or to body as he retreated.

Then, as the other charged, Gavin sidestepped with perfect ease, and, when the beach-comber wheeled clumsily to face him, threw one foot forward and at the same time pushed the larger man's shoulder violently with his open palm. It was a repetition of the "leverage theory" Gavin had so recently been expounding to his antagonist. It caught the lunging giant at precisely the right non-balance angle, as he was turning about. And, for the second time, the beach-comber sat down on the trampled sand, with unexpected suddenness and force.

Gavin Brice laughed aloud, with boyish mischief, and stood back, waiting for the cursing madman to scramble to his feet again. But, as the beach comber leaped up—and before he could get fairly balanced on his legs—another foot-and-palm maneuver sent him sprawling.

This time the puffing and foaming and insanely-badgered man did not try at once to rise. Instead, his hand whipped back to his thigh.

"My clumsy friend," Brice was saying, pleasantly, "I'm afraid you'll never win that watch. Shall we call it a day and quit? Or—"

He broke off with an exclamation of genuine wrath. For, with astonishing swiftness, the big hand had flown to the hip of the ragged trousers, had plucked a short-bladed fishing knife from its sheath, and had hurled it, dexterously, with the strength of a catapult, straight at his smiling adversary's throat.

The sub-tropic beach comber and the picaroon acquire nasty tricks with knives, and have an uncanny skill at their use.

Brice twisted to one side, with a sharp suddenness that all but threw his back out of joint. The knife whizzed through the still air like a great hornet. The breath of its passage fanned Gavin's averted face, as he wrenched his head out of its path.

The collie had watched the supposed gambols of the two men with keen, but impersonal, interest. But here at last was something he could understand. Instinct teaches practically every dog the sinister nature of a thrown object. The man on the ground had hurled something at the man whom the collie had begun to love. That meant warfare. To the canine mind it could mean nothing else.

And, ruff a-bristle and teeth bared, the dog flew at the beach comber. The latter had followed his throw by leaping to his feet. But, as he rose, the collie was at him. For an instant, the furry whirlwind was snarling murderously at his throat, and the man was beating convulsively at this unexpected new enemy.

Then, almost before the collie could slash to the bone one of the hairy big hands that thrust him backward, Gavin Brice had reached the spot in a single bound, had shoved the dog to one side and was at the man.

"Clear out, puppy!" he shouted, imperatively. "This is my meat! When people get to slinging knives, there's no more sense in handling them with gloves!"

The debonaire laziness was gone from Brice's voice and manner. His face was dead-white. His eyes were blazing. His mouth was a mere gash in the grim face. Even as he spoke, he had thrust the snarling collie away, and was at the beach-comber.

No longer was it a question of boxing or of half-jesting horseplay. The use of the knife had put this fight on a new plane. And, like a wild beast, Gavin Brice was attacking his big foe. But, unlike a wild beast, he kept his head, as he charged.

Disregarding the menace of the huge arms, he came to grips, without striking a single blow. Around him the beach-comber flung his constricting grasp. But this time the grip was worthless.

For, Brice's left shoulder jutted out in such manner as to keep the arms from getting their former hold around the body itself, and Brice's right elbow held off the grip on the other side. At the same time the top of Brice's head buried itself under the beachcomber's chin, forcing the giant's jaw upward and backward. Then, safe inside his opponent's guard, he abandoned his effort to stave off the giant's hold, and passed his own arms about the other's waist, his hands meeting under the small of the larger man's back.

The beach comber tried now to use his freed arms to gain the grip that had once been so effective. But his clasp could close only over the slope of Brice's back and could find no purchase.

While the man was groping for the right hold, Gavin threw all his own power into a single move. Tightening his underhold, and drawing in on the small of the giant's back, he raised himself on his toes, and pressed the top of his head, with all his might, against the bottom of the beach-comber's chin.

The trick was not new. But it was fearsomely effective. It was, as Gavin had explained, all a question of leverage. The giant's waist was drawn forward, His chin, simultaneously, was shoved backward. Such a dual cross pressure was due, eventually, to mean one of two things:—either the snapping of the spine or else the breaking of the neck. Unless the grip could be broken, there was no earthly help for its victim.

The beach comber, in agony of straining spine and throat, thrashed wildly to free himself. He strove to batter the tenacious little man to senselessness. But he could hit nothing but the sloping back, or aim clumsily cramped hooks for the top and sides of Gavin's protected head.

Meantime, the pressure was increasing, with a coldly scientific precision. Human nature could not endure it. In his extremity, the beach comber attempted the same ruse that had been so successful for Brice. He slumped, in pseudo-helplessness. The only result was to enable Gavin to tighten his hold, unopposed by the tensing of the enemy's wall of muscles.

"I'm through!" bellowed the tortured giant, stranglingly, his entire huge body one horror of agony. "'Nuff! I'm—"

He got no further. For, the unspeakable anguish mounted to his brain. And he swooned.

Gavin Brice let the great body slide inert to the sand. He stood, flushed and panting a little, looking down at the hulk he had so nearly annihilated. Then, as the beach comber's limbs began to twitch and his eyelids to quiver, Brice turned away.

"Come along, puppy," he bade the wildly excited collie. "He isn't dead. Another couple of seconds and his neck or his back must have gone. I'm glad he fainted first. A killing isn't a nice thing to remember on wakeful nights, the killing of even a cur like that. Come on, before he wakes up. I'm going somewhere. And it's a stroke of golden luck that I've got you to take with me, by way of welcome."

He had picked up and pocketed his watch. Now, lifting the knife, he glanced shudderingly at its ugly curved blade. Then he tossed it far out into the water. After which, he chirped again to the gladly following collie and made off down the beach, toward a loop of mangrove swamp that swelled out into the water a quarter-mile farther on.

The dog gamboled gayly about him, as they walked, and tried to entice him into a romp. Prancing invitingly toward Brice, the collie would then flee from him in simulated terror. Next, crouching in front of him, the dog would snatch up a mouthful of sand, growl, and make pattering gestures with his white forefeet at Gavin's dusty shoes.

Failing to lure his new master into a frolic, the dog fell sober and paced majestically alongside him, once or twice earning an absent-minded pat on the head by thrusting his muzzle into the cup of the walker's hand.