Donovan breathed deeply. "Immortality!"

Blascomb did not smile. "Only if the C.D. does not find you. Unlicensed

rejuvenation is punishable by execution in an extremely painful manner.

You're a doomed man now if the C.D. even finds you. The worst tortures

of the Middle Ages would be nothing compared to what Crane would do to

you or me if he tracks us down."

"You can stay in the present time-cycle," Donovan said, "but I'm tired

of control and supervision. Send me to some period where an individual

had a chance to work and live without state control. Give me the times

of individualism!"

"C.D. agents are everywhere in the time-cycles, tracking down illegal

immigrants. Quite a number of the men I've rejuvenated chose the

Renaissance for escape, but I'm afraid that a good part of that cycle's

carnage was the work of such C.D. agents as our friend Crane. I'd

recommend another period."

"The Golden Age of Greece?"

Blascomb shook his head. "Already taken. Aristotle, Plato, and a few

others are 25th century men. Archimedes was murdered by a C.D. agent,

and Socrates sent to his death by a group of them."

"Their fates were known to history--why did those men leave the 25th

century to live in that cycle?"

He shrugged his shoulders. "They probably felt that the few years of

extra life were worth it. Well, into what period do you want to go and

what would you do there?"

"I do not understand the paradoxes," Donovan said, "What if I chose to

build gravity-deflectors in Ancient Rome?"

"It would be impossible because there were no such manufacturers then.

It would mean that you were either promptly killed by a C.D. agent who

recognized the anachronistic attempt, or you had changed your mind."

"But if I can choose any period, it means that I can alter history at

will--which presumes that the present can also be changed."

"That is what the Komitet believes, and that is why the C.D. is so

ruthless and brutal with unlicensed time travellers. The real answer

is that in the final analysis your decision to choose a certain

time period is already made, and the things you will do are already

determined. Free will is an illusion; it is synonymous with incomplete

perception."

"Then send me into the 20th century. As an engineer I would be able to

make some sort of living there."

"Dangerous. Don't practice your profession. Study some field which is

completely alien to you so that should you come across a C.D. agent he

would not recognize the work of a 25th century man."

"You mean like an artist or a writer?"

"Why not?"

Donovan laughed. "I've never held a paint brush or written more than a

one-page letter, but why not? Unloose the cyclic band, Blascomb; set me

loose in the 20th century, and give my regards to the C.D.!"

* * * * *

In the dimly lighted garret above the tavern, Donovan stood before his

easel. His face was no longer lined, for the past twenty-five years

had made him a much younger man. He had taken Blascomb's advice and

had studied a field completely alien to him. In his own time, the 25th

century, his paintings would have been considered laughably amateurish,

but for 1926 they were infinitely superior to anything produced by 20th

century artists.

"Why can't they _see_?" he asked his agent angrily, when his third show

passed without the sale of a single painting.

"I can see them," the agent said, standing in front of a still-life

abstraction with flashes of color, "but your way of working is too far

advanced for our time. Believe me, a few hundred years from now your

paintings will be regarded as the work of a great genius."

"In the meantime, I starve."

"I can help you."

Donovan threw down the paint brushes. "No. No. There's no use being

ahead of one's time. I can't make a living as an artist. I may as well

go back to digging ditches."

"Maybe you can work part-time and paint at night. What did you do

before you started painting?"

He hesitated, but what was there to be afraid of? "I--I was an

engineer."

"I can get you a job with a construction company."

"No. No! I want nothing whatever to do with engineering! Nothing!"

In the 25 years that he had lived in the 20th century he had turned

from a man of 65 to a healthy, robust 40. For a long time he had lived

in fear that the dreaded arms of the C.D. would reach out for him, and

that he would stand face to face with terror-inspiring Crane. But he

had never met anyone who seemed to be a C.D., a Criminal Destroyer.

Sometimes he felt the avenging sword of the Komitet hanging over his

head.

There were some statesmen and philosophers mentioned in the newspapers

whose ideas seemed to indicate a 25th century origin, but he avoided

them in the fear that they might be plants to draw out the illegals. It

was probably that the C.D. would never find out the deception, and if

they did there was little chance of locating him among the two billion

people on Home Planet.

"You have to make a living somehow," the agent persisted.

"I know nothing but engineering," Donovan said, "and that I will never

do."

"Maybe there's some other field in which you could use engineering

skills." He thought for a moment, and then reached into his briefcase.

"I picked this up on a newsstand. You might like it."

Donovan glanced at the magazine's cover.

"It's the latest thrill--scientific fiction. Maybe with your

engineering knowledge you could write a story or two."

* * * * *

When the agent left, Donovan read through the magazine, then went

out to look up other stories of the same nature. One story offered a

time-travel theory which was absurdly inaccurate. Another purported

to deal with the inhabitants of Mars, none of which looked at all

the way the writers imagined them to be. Donovan read as many as he

could find, and was fascinated by the hopeless incompetence and

scientific inaccuracy of the so-called writers. The time-travel story

was laughable; even a child could produce a far more exciting tale by

describing the Watson-Gorshevich experiments that lead to the discovery

of repetitive time-cycles back in 2364.

_Why not_, he thought to himself. _Why not write these stories of

the future? Who could do them better than a man who had come from

the future?_ These were not engineering journals where accuracy was

required, nor would anyone ever act upon the scientific discoveries he

might record. Above all, no one would attempt to build any machines

which would immediately attract the attention of the C.D. He would do

nothing which would in the slightest way affect historic development.

Pressed by the need for money, and fascinated by the possibilities

in science fiction, Donovan began to write a story. He employed a

pen-name, and avoided the general theory of retrograde-cycle travel

backward above time, but limited himself to travelling spirally into

the future. He described the mechanism he himself would have to produce

in order to get back to Blascomb for anabolism-correction, and produced

a fanciful tale regarding life in the year 3,000. The letter from the

editor came within a week.

_Dear Mr. Donovan_:

_Enclosed find check for your story, "Turn Backward, O Time!" I have

seldom read a more convincing fantasy. One could almost believe that

the apparatus you described would actually work. I believe this

story will be a science-fiction classic and am placing your original

manuscript in my collection. I would appreciate seeing other

examples of your work._

When the story appeared in print, several paragraphs describing

the construction of the time-machine were omitted by the editor.

"Technically unconvincing," they told him; "they mar up the

verisimilitude of a great story." "Turn Backward, O Time!" became an

instant success.

A few days later, Donovan contributed another story, this time based

on actual events on Jupiter which he simply transferred to a different

time-cycle on Vega. Vaguely recalling some warning of Blascomb's that

while the future could not be changed, it was best to play safe and

not draw the attention of the C.D., he twisted and changed all the

scientific facts involved. The check for the second story was promptly

sent.

Within a few months Donovan, under his pseudonym, which was kept

secret, was launched upon his career as a writer of science fiction.

Readers praised him for his convincing fantasy and editors competed for

his services.

* * * * *

Memory of the 25th century gradually faded from his mind as years

passed. At times he awoke in horror after nightmares that Crane of the

C.D. had finally caught him, but these terrifying dreams became rarer.

He had exposed himself repeatedly in fiction. Time and time again he

had described actual historical events of the Space Colony Wars in

his stories. On one occasion he described the technique for the cure

of cancer discovered in 2019. The readers' section of the magazine

soon carried letters from doctors who were amused that a writer could

present such a simple household remedy and dare suggest that it might

be efficacious for cancer.

Donovan was amused by the thought that Crane might be diligently

searching for him somewhere in the Renaissance; if so, the C.D. agent's

fury must be mounting.

He changed his name and identity every ten years to conceal his gradual

return to youth. He had the pleasure of seeing himself hailed as his

successor in popularity, as he established new names and let the older

ones die out. His excuse to the editors was that he wanted to enter

into competition anew, make sure that his name alone was not carrying

the stories. He was happy. Sometimes, however, later stories were

panned by "fans" as "imitations of the classics by the greatest stf

writer the world has ever known."

Only the aging gentleman who had bought Donovan's first manuscript

knew, but the old man signed the checks and said nothing.

In his happiness and self-satisfaction, Donovan became more careless

with his stories. If he had been able to outwit Crane and the dreaded

C.D., surely he could dash off stories good enough for the poor minds

of 20th century science-fiction readers!

Then the tide turned. Fan letters in the magazines began really to tear

into his fiction; they _were_ third-rate; they lacked imagination.

They were ordinary stories written by an ordinary mind; and science

fiction required tales written by men whose minds were well ahead of

20th century thought. The day finally came when all the editors began

rejecting his stories. First one, then another--and finally every story

written received a rejection slip.

Donovan could not understand the reason for the change. A few years

ago--or was it decades?--each story of his was labelled a "classic";

now they were not even acceptable. Had science fiction changed so much

since his decision to become a writer in 1929? He dared not discuss it

with anyone, for he had no friends and he trusted no one. The C.D. was

everywhere, but there was one man in whom he had the deepest confidence.

Donovan visited the aging editor and felt sorry for the worn-out old

man. He himself had once been like this, but was now free from death.

He thought of taking his benefactor with him into the 25th century

and saving the editor's life. But suppose Blascomb's laboratory had

been captured? Donovan could manage for himself, but it would be cruel

to leave the old man in the deadly hands of the C.D. No, it was best

to say nothing about rejuvenation to the editor; he would only think

Donovan was trying out a story-idea.

"I've been your editor for thirty years," the old man's voice cracked.

His half-blind eyes loomed through thick lenses.

"It's been a long time," Donovan said.

"My--My eyes are not what they used to be," the other said, "A man

about 50 years old wrote that great classic, "Turn Backward, O Time!"

He must be about 80 now. But you look only 20. Ah, laddie, you're

trying to fool me. You must be his son!"

"That's right," Donovan said quickly, "We have the same name."

"Then that explains it," the other said wearily; "it would break my old

heart if a talent like your father's disintegrated. But we came to talk

about your stories. No, son, you're not the writer your father was.

Your tales lack imagination; there is no originality in them. The ideas

are hackneyed, the writing third-rate. They sound like poor imitations

of the great tales told by your father. There was a man! There was a

writer!"

* * * * *

Donovan left him, keeping the secret of his identity. When he returned

to his home he looked in the mirror, and the face of a rose-cheeked

20-year-old youngster stared back at him. Fifty years of happy living

in the 20th century! It would soon be necessary to return to the 25th

century so that Blascomb could reverse the antibiotic catalytic process

that had set him growing younger. It was impossible to stay in his

present youthful state much longer. In a few years he would be a child.

With a sigh he walked to his desk, took out paper and pen, and began to

draw the diagrams for the apparatus which would send him forward into

the 25th century.

For three hours he worked confidently, and then the sweat began to drip

from his forehead and his heart began to pound fearfully. "It is not

possible," he said, uneasily. "It will all come back to me soon. Now

what the devil did Blascomb tell me?"

He had become lazy, and his brain was not used to hard work. He said

this to himself but he could not shake off the sense of fear. He took

a cold shower, rubbing himself briskly, then shot a stimulant into his

blood stream. Preparing the desk once more, he began to work.

The papers gathered, the pencils broke, and the night gradually turned

to morning. The finished sketch of the cycle travellers was basically

correct, but the most important operating mechanism was still missing.

Try as he could, he was unable to bring it up from his memory.

"By the solar system," he swore, "what is the matter with me? I have

forgotten every detail."

He tried to think back. At one time he had known the mechanism

thoroughly. As an engineer he was completely familiar with every single

plate and tube, but now he couldn't remember anything but the general

appearance of the finished machine. Fear spurred his mind as he hunted

for a solution. Something was happening to his mind. He began to think

of his stories. The same thing had happened there. At one time he

remembered every detail of life in the 25th century, and could describe

them easily. Now events were dim and he knew now why his recent stories

were poor. They were not written from actual memory of the future, but

were the ordinary stories one might expect from a 20-year-old boy. The

past was dim and memory faded. Blascomb and Crane, Crane and Blascomb,

which was the C.D. agent, and what was C.D. anyway?

Enough of the details remained to shock him into an awareness of his

desperate plight. The rejuvenation process had worked too well, for

Donovan had waited dangerously long. As the body grew younger the

tissue cells were consumed and youthful cells replaced them. The

process that had worked for body cells did the same for the cells of

the brain. Those portions of the brain containing the knowledge and

ability of a 70-year-old man were gradually being replaced with new,

untrained cells. He had failed to re-educate himself as new cells

replaced the old, and had come to the brink of disaster. Sufficient

intelligence and manual dexterity remained to compensate for that, but

in a few years the task would be hopeless.

* * * * *

Excitedly, for he knew his life depended on it, he rummaged through his

book shelves looking for a copy of his first story, "Turn Backward, O

Time!" It contained, he remembered, a concise, accurate description

of the mechanism for the time-machine. The magazine itself was old,

the sheets turning brown and the pages breaking. He read the story in

haste, vaguely remembering the plot. The actual description of the

operating mechanism, he found to his consternation, was missing. "I

will cut one or two paragraphs," the editor had said, "_They are not

convincing, technically ... they lack verisimilitude!_"

Not convincing! If he did not find them he was doomed to become a

child, and then a babbling idiot of a baby and would disappear entirely

within twenty years. He telephoned the magazine's office and asked for

the editor.

"Sorrree," the secretary said, "Mr. O'Sloane is quite ill. The doctors

are afraid he might not pass through the night. He's very old, you

know."

"Can he speak?" Donovan asked desperately.

"He's had a stroke. Can't say a word. Completely paralyzed, Sorrreee."

Donovan cursed the carelessness that had led him to this difficult

position. He knew that O'Sloane kept the originals of his favorite

stories in a collection in his office. If O'Sloane died it was

possible that some enterprising youthful editor would destroy the old

manuscripts in a fit of house-cleaning.

"This is Donovan," he said quickly, "I am trying to locate the original

copy of "Turn Backward, O Time" which O'Sloane has in his files. I must

study the original papers; it's extremely important. If there is a

substitute editor, will you ask him to keep an eye open for it."

"Cerrrtainleee."

He sighed and took a taxi to the editorial office. It would be best

to get it as quickly as possible. The original manuscript was quite

safe. Donovan need only copy the original description. Even if he were

no longer able to grasp the theory of it, the machine was still easy

enough to build from the description.

Within a few hours he would be back in the 25th century for a reversal.

For his next trip back he would choose Ancient Egypt. The 20th century

was heading for the Atomic Wars and he was fortunate in being able to

escape. After Egypt he would choose the Inca civilization. Did they not

have legends of white gods that ruled them? The world was his, and he

would be forever young. Immortality was within his grasp. No one could

stop him now.

He arrived at the building and rushed up the steps to the editorial

office.

"We found the manuscript, Mr. Donovan," the secretary told him

brightly, looking twice at the flushed, handsome face.

* * * * *

Donovan stepped into O'Sloane's office. Practically nothing had been

touched as yet, for one of the staff editors had just begun to sort a

pile of stacked papers from several cabinets. Donovan recognized the

original manuscript of "Turn Backward, O Time!" upon the desk, and

hurriedly skimmed through the pages. The description was intact, and

while he could not remember why such a machine would work, he knew that

it could be built and he could escape.

With a sigh he pocketed the manuscript and introduced himself to the

young editor who would probably succeed O'Sloane upon his death.

"Oh yes," the editor with the curious thin smile said, "I have heard

quite a bit about you, and have been waiting a long time for this

meeting. We've met before, you know."

"Really?" Donovan said. The face did appear familiar, but he could not

recall the occasion.

"My name is Edel W. Crane, C.D."

Donovan felt a cold tremor of fear shake his body.

He moistened his lips.

"What do the letters C.D. stand for?"

The pasty-faced young man closed and then locked the door of the

office. Walking towards Donovan, the smile no longer there, he told

him. Then he did what he had come to do.

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