tiller to him. They'd discovered that the steering gear could be shifted from side to side of the front of the vehicle, so that it could be driven from either the right or left side. On a planet without cities but with highways running thousands of miles to the polar ice-caps, long-distance driving would be the norm. Conveniences for that purpose would be logical. Drivers could relieve each other without difficulty.

"Look it over," commanded Borden. "The logical way to sabotage a talkie would be to throw its capacitances out of balance. No visible sign of damage, but I couldn't find a band it wasn't tuned to. See if that was the trick."

Jerry busied himself as Borden drove on. Here the highway wound through great hills, the color of iron rust and carved by wind and sand into incredibly grotesque shapes. A long trail of swirling dust arose behind the racing cruiser.

Borden said abruptly, "I've been thinking. Check me, will you two? First, I think the people who made this vehicle were much like us. The skeletons proved that. They had families and pets and they made cars like this to travel long distances on highways they'd built from pole to pole. This car uses normal electric power, and its power source is good! So they should have had radio frequency apparatus as well as power. But no radio frequency is being used on this planet. The race that built this car, then, has either changed its culture entirely, or been wiped out."

Jerry said blankly, "You mean, the people in the white spot—"

"Are not, and were not the race that built the roads and made this machine," said Borden. "In fact, we've passed two forts where people like us died by tens of thousands, fighting against something from the white spot. They had long-range weapons, but at the end they were fighting with fire. You saw the soot! It was as if they burned oil by thousands of gallons to hold back something their long-range weapons couldn't stop. Fire is a short-range weapon, though a sun-mirror need not be. But nothing stopped this enemy. Vehicles like this were pulled right in half. That doesn't suggest people. It suggests a thing—something so gigantic and horribly strong that needle beams of flame couldn't stop it, and against which flame seemed a logical weapon to use. It must have been gigantic, because it could pull a land car apart endwise."

Ellen waited. Jerry knitted his brows.

"I'm afraid," Jerry said, "I can't think of anything that would be big and ... I just can't think what they could 

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