Med Ship Man, Murray Leinster [famous ebook reader .TXT] 📗

for energy. Then the six-million-kilowatt demand came again for half a second.

"The cattle fence," said Calhoun, "works for half a second out of every two seconds. It's intermittent or it would simply paralyze animals that wandered into it. Or people. Being intermittent, it drives them out instead. There'll be tools and parts for equipment here, in case something needs repair. I want you to make something new."

The two electronics technicians asked questions.

"We need," said Calhoun, "an interruptor that will cut off the power broadcast for the half-second the ground-induction field is supposed to be on. Then it should turn on the broadcast power for the second and a half the cattle fence is supposed to be off. That will stop the cattle-fence effect, and I think a ground car should be able to work with power that's available for three half-seconds out of four."

The electronics men blinked at him. Then they grinned and set to work. Calhoun went exploring. He found a lunch box in a desk with three very stale sandwiches in it. He offered them around.

It appeared that nobody wanted to eat while their families—at the end of the highway—were still hungry.

The electronics men called on the two mechanics to help build something. They explained absorbedly to Calhoun that they were making a cutoff which would adjust to any sudden six-million-kilowatt demand, no matter what time interval was involved. A change in the tempo of the cattle-fence cycle wouldn't bring it back on.

"That's fine!" said Calhoun. "I wouldn't have thought of that!"

He bit into a stale sandwich and went outside. Allison sat limply, despairingly, in his seat in the car.

"The cattle fence is going off," said Calhoun without triumph. "The people of the city will probably begin to get here around sunrise."

"I—I did nothing legally wrong!" said Allison, dry-throated. "Nothing! They'd have to prove that I knew what the—consequences of the research project would be. That couldn't be proved! It couldn't! So I've done nothing legally wrong...."

Calhoun went inside, observing that the doctor who was also tennis champion, and the policeman who'd come to help him, were keeping keen eyes on the city and the foundations of the grid and all other places from which trouble might come.

There was a fine atmosphere of achievement in the power-control room. The power itself did not pass through these instruments, but relays here controlled buried massive conductors which supplied the world with power. And one of the relays had been modified. When the cattle-fence projector closed its circuit, the power went off. When the ground-inductor went off, the power went on. There was no longer a barrier across the highways leading to the east. It was more than probable that ground cars could run on current supplied for one and a half seconds out of every two. They might run jerkily, but they would run.

Half an hour later, the amount of power drawn from the broadcast began to rise smoothly and gradually. It could mean only that cars were beginning to move.

Forty-five minutes later still, Calhoun heard stirrings outside. He went out. The two men on guard gazed off into the city. Something moved there. It was a ground-car, running slowly and without lights. Calhoun said undisturbedly:

"Whoever was running the cattle fence found out their gadget wasn't working. Their lights flickered, too. They came to see what was the matter at the landing-grid. But they've seen the lighted windows. Got your blasters handy?"

But the unlighted car turned and raced away. Calhoun only shrugged.

"They haven't a prayer," he said. "We'll take over their apparatus as soon as it's light. It'll be too big to destroy, and there'll be fingerprints and such to identify them as the men who ran it. And they're not natives. When the police start to look for the strangers who were living where the cattle-fence projector was set up.... They can go into the jungles where there's nothing to eat, or they can give themselves up."

He moved toward the door of the control building once more. Allison said desperately:

"They'll have hidden their equipment. You'll never be able to find it!"

Calhoun shook his head in the starlight.

"Anything that can fly can spot it in minutes. Even on the ground one can walk almost straight to it. You see, something happened they didn't count on. That's why they've left it turned on at full power. The earlier, teasing uses of the cattle fence were low-power. Annoying, to start with, and uncomfortable the second time, and maybe somewhat painful the third. But the last time it was full power."

He shrugged. He didn't feel like a long oration. But it was obvious. Something had killed the plants of a certain genus of which small species were weeds that destroyed Earth-type grasses. The ground-cover plants—and the larger ones, like the one Calhoun had seen decaying in a florist's shop which had had to be grown in a cage—the ground-cover plants had motile stems and leaves and blossoms. They were cannibals. They could move their stems to reach, and their leaves to enclose, and their flowers to devour other plants, even perhaps small animals. The point, though, was that they had some limited power of motion. Earth-style sensitive vines and flycatcher plants had primitive muscular tissues. The local ground-cover plants had them too. And the cattle-fence field made those tissues contract spasmodically. Powerfully. Violently. Repeatedly. Until they died of exhaustion. The full-power cattle-fence field had exterminated Mayan ground-cover plants all the way to the end of the east-bound highway. And inevitably—and very conveniently—also up to the exact spot where the cattle-fence field had begun to be projected. There would be an arrow-shaped narrowing of the wiped-out ground-cover plants where the cattle-field had been projected. It would narrow to a point which pointed precisely to the cattle-fence projector.

"Your friends," said Calhoun, "will probably give themselves up and ask for mercy. There's not much else they can do."

Then he said:

"They might even get it. D'you know, there's an interesting side effect of the cattle fence. It kills the plants that have kept Earth-type grasses from growing here. Wheat can be grown here now, whenever and as much as the people please. It should make this a pretty prosperous planet, not having to import all its bread."

The ground cars of the inhabitants of Maya City did begin to arrive at sunrise. Within an hour after daybreak, very savagely intent persons found the projector and turned it off.

By noon there was still some anger on the faces of the people of Maya, but there'd been little or no damage, and life took up its normal course again. Murgatroyd appreciated the fact that things went back to normal. For him it was normal to be welcomed and petted when the Med Ship Esclipus Twenty touched ground. It was normal for him to move zestfully in admiring human society, and to drink coffee with great gusto.

And while Murgatroyd moved in human society, enjoying himself hugely, Calhoun went about his business. Which, of course, was conferences with planetary health officials, politely receiving such information as they thought important, and tactfully telling them about the most recent developments in medical science.

What else was a Med Ship man for?

End of the Project Gutenberg EBook of Med Ship Man, by Murray Leinster