Something lashed out from the vessel. Hargraves did not see it go because it, too, went faster than the eye could follow. But he knew what it was. The sound told him. He saw the hole appear in the sphere. A round hole that opened inward. Dust puffed outward.

Wham, wham, wham!

The negatron! The blood brother of the defense screen, its energies concentrated into a pencil of radiation. Faster than anyone could see it happen, three more holes appeared in the sphere, driving through its outer shell, punching into the machinery at its heart.

The sphere shuddered under the impact. It turned. Light spewed out of it, beaming viciously into this alien sky without direction. Smoke boiled from the ball. Turning it seemed to roll along the sky. It looked like a huge burning snowball rolling down some vast hill.

Ron Val lifted a white face from the sighting 'scope of the negatron.

"Did—did I get him?"

"I'll say you did!" Hargraves heard somebody shout exultantly. He was surprised to discover his own voice was doing the shouting. The sphere was finished, done for. It was out of the fight, rolling down the vast hill of the sky, it would smash on the planet below.

They were following it.

There was still no answer from the engine room.

"Space suits!" Hargraves ordered. "Nielson, you stay here. Ron Val, you others, come with me."

CHAPTER II

Vegan World

The engine room was crammed to the roof with machinery. The bulked housings of the atomics, their heavy screens shutting off the deadly radiations generated in the heart of energy seething within the twin domes, were at the front. They looked like two blast furnaces that had somehow wandered into a space ship by mistake and hadn't been able to find their way out again. The fires of hell, hotter than any blast furnace had ever been, seethed within them.

Behind the atomics were the Kruchek drivers, twin brawny giants chained to the treadmill they pushed through the skies. Silent now. Not 

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