And Svetz had dreamed that night, vividly. Over and over his extension cage appeared inside solid rock, exploded with a roar and a blinding flash.

“Officially the horse is for the Bureau of History,” Ra Chen had said. “In practice it’s for the Secretary-General, for his twenty-eighth birthday. Mentally he’s about six years old, you know. The royal family’s getting a bit inbred these days. We managed to send him a picture book we picked up in 130 PA, and now the lad wants a horse…”

Svetz had seen himself being shot for treason, for the crime of listening to such talk.

“…Otherwise we’d never have gotten the appropriation for this trip. It’s in a good cause. We’ll do some cloning from the horse before we send the original to the UN. Then—well, genes are a code, and codes can be broken. Get us a male, and we’ll make all the horses anyone could want.”

But why would anyone want even one horse? Svetz had studied a computer duplicate of the child’s picture book that an agent had pulled from a ruined house a thousand years ago. The horse did not impress him.

Ra Chen, however, terrified him.

“We’ve never sent anyone this far back,” Ra Chen had told him the night before the mission, when it was too late to back out with honor. “Keep that in mind. If something goes wrong, don’t count on the rule book. Don’t count on your instruments. Use your head. Your head, Svetz. Gods know it’s little enough to depend on…”

Svetz had not slept in the hours before departure.

“You’re scared stiff,” Ra Chen had commented just before Svetz entered the extension cage. “And you can hide it, Svetz. I think I’m the only one who’s noticed. That’s why I picked you, because you can be terrified and go ahead anyway. Don’t come back without a horse….”

The Director’s voice grew louder. “Not without a horse, Svetz. Your head, Svetz, your HEAD…”

Svetz sat up convulsively. The air! Slow death if he didn’t close the door! But the door was closed, and Svetz was sitting on the floor holding his head, which hurt.

The air system had been transplanted intact, complete with dials, from a martian sandboat. The dials read normally, of course, since the cage was sealed.

Svetz nerved himself to open the door. As the sweet, rich air of twelfth-century Britain rushed in, Svetz held his breath and watched the dials change. Presently he closed the door and waited, sweating, while the air system replaced the heady poison with its own safe, breathable mixture.

When next he left the extension cage, carrying the flight stick, Svetz was wearing another spin-off from the interstellar exploration industries. It was a balloon and he wore it over his head. It was also a selectively permeable membrane, intended to pass certain gases in and others out, to make a breathing-air mixture inside.

It was nearly invisible except at the rim. There, where light was refracted most severely, the balloon showed as a narrow golden circle enclosing Svetz’s head. The effect was not unlike a halo as shown in medieval paintings. But Svetz didn’t know about medieval paintings.

He wore also a simple white robe, undecorated, constricted at the waist, otherwise falling in loose folds. The Institute thought that such a garment was least likely to violate taboos of sex or custom. The trade kit dangled loose from his sash: a heat-and-pressure gadget, a pouch of corundum, small phials of additives for color.

Lastly he wore a hurt and baffled look. How was it that he could not breathe the clean air of his own past?

The air of the cage was the air of Svetz’s time, and was nearly four percent carbon dioxide. The air of 750 AnteAtomic held barely a tenth of that. Man was a rare animal here and now. He had breathed little air, he had destroyed few green forests, he had burnt scant fuel since the dawn of time.

But industrial civilization meant combustion. Combustion meant carbon dioxide thickening in the atmosphere many times faster than the green plants could turn it back to oxygen. Svetz was at the far end of two thousand years of adaptation to air rich in CO2.

It takes a concentration of carbon dioxide to trigger the autonomic nerves in the lymph glands in a man’s left armpit. Svetz had fainted because he wasn’t breathing.

So now he wore a balloon, and felt rejected.

He straddled the flight stick and twisted the control knob on the fore end. The stick lifted under him, and he wriggled into place on the bucket seat. He twisted the knob further.

He drifted upward like a toy balloon.

He floated over a lovely land, green and untenanted, beneath a pearl-grey sky empty of contrails. Presently he found a crumbling wall. He turned to follow it.

He would follow the wall until he found a settlement. If the old legend was true—and, Svetz reflected, the horse had certainly been big enough to drag a vehicle—then he would find horses wherever he found men.

Presently it became obvious that a road ran along the wall. There the dirt was flat and bare and consistently wide enough for a walking man; whereas elsewhere the land rose and dipped and tilted. Hard dirt did not a freeway make; but Svetz got the point.

He followed the road, floating at a height of ten meters.

There was a man in worn brown garments. Hooded and barefoot, he walked the road with patient exhaustion, propping himself with a staff. His back was to Svetz.

Svetz thought to dip toward him to ask concerning horses. He refrained. With no way to know where the cage would alight, he had learned no ancient languages at all.

He thought of the trade kit he carried, intended not for communication, but instead of communication. It had never been field-tested. In any case it was not for casual encounters. The pouch of corundum was too small.

Svetz heard a yell from below. He looked down in time to see the man in brown running like the wind, his staff forgotten, his fatigue likewise.

“Something scared him,” Svetz decided. But he could see nothing fearful. Something small but deadly, then.

The Institute estimated that man had exterminated more than a thousand species of mammal and bird and insect—some casually, some with malice—between now and the distant present. In this time and place there was no telling what might be a threat. Svetz shuddered. The brown man with the hairy face might well have run from a stinging thing destined to kill Hanville Svetz.

Impatiently Svetz upped the speed of his flight stick. The mission was taking far too long. Who would have guessed that centers of population would have been so far apart?

Half an hour later, shielded from the wind by a paraboloid force field, Svetz was streaking down the road at sixty miles per hour.




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