Gradually the exploring crew moved away from the line of carts, past the mining operations and over a ridge beyond. There was no special hurry; they departed without having reacted to the ore-gathering syndrome.

“Maybe they’re from the same factory,” Morrison said hopefully.

O’Neill pointed to the antennas visible on the major mining equipment. “Their vanes are turned at a different vector, so these represent two factories. It’s going to be hard; we’ll have to get it exactly right or there won’t be any reaction.” He clicked on the radio and got hold of the monitor at the settlement. “Any results on the consolidated back-order sheets?”

The operator put him through to the settlement governing offices.

“They’re starting to come in,” Ferine told him. “As soon as we get sufficient samplings, we’ll try to determine which raw materials which factories lack. It’s going to be risky, trying to extrapolate from complex products. There may be a number of basic elements common to the various sublets.”

“What happens when we’ve identified the missing element?” Morrison asked O’Neill. “What happens when we’ve got two tangent factories short on the same material?”

“Then,” O’Neill said grimly, “we start collecting the material ourselves—even if we have to melt down every object in the settlements.”

III

In the moth-ridden darkness of night, a dim wind stirred, chill and faint. Dense underbrush rattled metallically. Here and there a nocturnal rodent prowled, its senses hyper-alert, peering, planning, seeking food.

The area was wild. No human settlements existed for miles; the entire region had been seared flat, cauterized by repeated H-bomb blasts. Somewhere in the murky darkness, a sluggish trickle of water made its way among autofac slag and weeds, dripping thickly into what had once been an elaborate labyrinth of sewer mains. The pipes lay cracked and broken, jutting up into the night darkness, overgrown with creeping vegetation. The wind raised clouds of black ash that swirled and danced among the weeds. Once an enormous mutant wren stirred sleepily, pulled its crude protective night coat of rags around it and dozed off.