And then Tark's greater weight was smothering him, Tark's huge jaws had closed on the back of his neck, and Tark was shaking him as a wolf-cub shakes a rat. The leader of the Clan flung Nelson from him, rolling over and over, and stood contemptuous and lordly in his strength, laughing with his red tongue run out between his open jaws.

"You've yet to learn," came his thought, "that I, Tark, lead the pack of the Hairy Ones!"

And Nelson, gathering himself, sent back the raging thought, "But I am not of your Clan!"

He sprang again at Tark.

It was strange, how he knew the ways of fighting. To dart in low to snap the foreleg, to use the breast as a ram, to keep the throat always covered, to dodge and dance and whirl and give the long terrible slashing stroke where the hair thins on the side of the opponent's neck, over the vein.

All these things Nelson knew and knew well. He was young and powerful and he was fighting to kill. But it availed him nothing. Tark moved like a wraith before him so that his jaws rang shut on the empty air-and before he could recover himself the old pack lord would smash him off balance with his greater weight and his jaws would chop and slash and then he would be away again, out of reach, laughing.

Nelson sprang and sprang again, and was beaten down, and would not quit. The hot sweet taint of blood reddened the air, and the great black stallion tossed his head and stamped his hoofs on the glassy floor. Quorr wrinkled his striped face in a snarling grin, and his claws ran in and out of their velvet sheaths and his tail twitched.

Only Ei perched motionless on the back of Nsharra's chair. The girl's face was white and full of pity and there was a sickness in her eyes. She looked pleadingly at her father, who sat watching with dark, somber eyes.

In answer to Nsharra's look Kree sighed and said, "Do not hurt him, Tark — more than you must."

And Tark answered, panting, "He must learn to obey!"