source of the new food massed in one spot.

Effortlessly it pushed itself into the air, flew a little way and dropped on the food. Its super-efficient cells eagerly gulped the rich radioactive substances. But it did not ignore the lesser potentials of metal and clumps of carbohydrates.

"The damned fools," General O'Donnell said. "Why did they have to panic? You'd think they'd never been trained." He paced the ground outside his tent, now in a new location three miles back.

"The

The leech had grown to two miles in diameter. Three farming communities had been evacuated.

Micheals, standing beside the general, was still stupefied by the memory. The leech had accepted the massed power of the weapons for a while, and then its entire bulk had lifted in the air. The Sun had been blotted out as it flew leisurely over North Hill, and dropped. There should have been time for evacuation, but the frightened soldiers had been blind with fear.

Sixty-seven men were lost in Operation Leech, and General O'Donnell asked permission to use atomic bombs. Washington sent a group of scientists to investigate the situation.

"Haven't those experts decided yet?" O'Donnell asked, halting angrily in front of the tent. "They've been talking long enough."

"It's a hard decision," Micheals said. Since he wasn't an official member of the investigating team, he had given his information and left. "The physicists consider it a biological matter, and the biologists seem to think the chemists should have the answer. No one's an expert on this, because it's never happened before. We just don't have the data."

"It's a military problem," O'Donnell said harshly. "I'm not interested in what the thing is—I want to know what can destroy it. They'd better give me permission to use the bomb."

Micheals had made his own calculations on that. It was impossible to say for sure, but taking a flying guess at the leech's mass-energy absorption rate, figuring in its size and apparent capacity for growth, an atomic bomb might overload it—if used soon enough.

He estimated three days as the limit of usefulness. The leech was growing at a geometric rate. It could cover the United States in a few months.

"For a week I've been asking 

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