"One hundred and thirty-two pounds and make it fast!" He turned back to the youngster. "You better get off this base fast, for if I have to skip my take- off I'll wring your neck."

The elevator climbed into place presently and three cadets poured across. Two were carrying sandbags, one had five lead weights. They strapped the sandbags to the' vacant couch, and clamped the weights to its sides. "One thirty-two mass," announced one of the cadets.

"Get going," snapped the pilot and turned back to the board.

"Don't blow your tubes, Harry," advised the cadet addressed. Matt was amazed, then decided the pilot must be a cadet, too. The three left, taking with them the boy; the hatch door shut with a whish.

"Stand by to raise!" the pilot called out, then looked down to check his passengers. "Passengers secure, nineteen," he called to the tower. "Is that confounded elevator clear?"

There was silence as the seconds trickled away.

The ship shivered. A low roar, muffled almost below audibility, throbbed in Mart's head. For a moment he felt slightly heavy, the feeling passed, then he was pressed strongly against the pads.

Matt was delighted to find that three gravities were not bad, flat on his back as he was. The minute and a half under power stretched out; there was nothing to hear but the muted blast of the reactor, nothing to see but the sky through the pilot's port above.

But the sky was growing darker. Already it was purple; as he watched it turned black. Fascinated, he watched the stars come out.

"Stand by for free fall!" the pilot called out, using an amplifier. "You'll find sick kits under each pillow. If you need 'em, put 'em on. I don't want to have to scrape it off the port."