file:///F|/rah/Larry%20Niven/Niven,%20Larry%20-%20The%20Flight%20of%20the%20Horse.txt
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. God knows it's
little enough to depend on . . ."
Svetz had not slept in the hours before departure.
"You're scared stiff," Ra Chen 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, complete with dials, intact 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 gasses 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 breath the clean air of his
own past?
The air of the cage was the air of Svetz's own time, and was nearly four percent carbon dioxide.
The air of 750 Ante Atomic held barely a tenth of that. Man was a rare animal here and now. He had
breathed little air, he had destroyed few 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
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