helping mankind to spread his colonies and civilizations throughout the galaxy. The bitter years of galactic war had ended in his childhood, and now human societies throughout the Milky Way were linked together—in greater or lesser degree of union—into a more-or-less peaceful coalition of star groups.

There were two great motivating forces at work on those human societies spread across the stars, and these forces worked toward opposite goals. On the one hand was the urge to explore, to reach new stars, new planets, to expand the frontiers of man's civilizations and found new colonies, new nations. Pitted against this drive to expand was an equally-powerful force: the realization that technology had finally put an end to physical labor and almost to poverty itself on all the civilized worlds of man. The urge to move off to the frontier was penned in and buried alive under the enervating comforts of civilization.

The result was inescapable. The civilized worlds became constantly more crowded as time wore on. They became jampacked islands of humanity sprinkled thinly across the sea of space that was still full of unpopulated islands.

The expense and difficulty of interstellar travel was often cited as an excuse. The starships were expensive: their power demands were frightful. Only the most determined—and the best financed—groups of colonists could afford them. The rest of mankind accepted the ease and safety of civilization, lived in the bulging cities of the teeming planets. Their lives were circumscribed by their neighbors, and by their governments. Constantly more people crowding into a fixed living space meant constantly less freedom. The freedom to dream, to run free, to procreate, all became state-owned, state-controlled monopolies.

And Leoh had contributed to this situation.

He had contributed his thoughts and his work. He had contributed often and regularly—the interstellar communications systems was only the one outstanding achievement in a long career of achievements.

Leoh had been nearly at the voluntary retirement age for scientists when he realized what he, and his fellow scientists, had done. Their efforts to make life richer and more rewarding for mankind had made life only less strenuous and more rigid.

And with every increase in comfort, Leoh discovered, came a corresponding increase in neuroses, in crimes of violence, in mental aberrations. Senseless wars of pride broke out between star-groups for the first time in generations. Outwardly, the peace of the galaxy was assured; but beneath the glossy surface of the Terran Commonwealth there smoldered the beginnings of a volcano. Police actions fought by the Star Watch were increasing ominously. Petty wars between once-stable peoples were flaring up steadily.

Once Leoh realized the part he had played in this increasingly tragic drama, he was confronted with two emotions—a deep sense of guilt, both personal and professional; and, countering this, a determination to do something, anything, to restore at least some balance to man's collective mentality.

Leoh stepped out of physics and electronics, and entered the field of psychology. Instead of retiring, he applied for a beginner's status in his new profession. It had taken considerable bending and straining of the Commonwealth's rules—but for a man of Leoh's stature, the rules could be flexed somewhat. Leoh became a student once again, then a researcher, and finally a Professor of Psychophysiology.

Out of this came the dueling machine. A combination of electroencephalograph and autocomputer. A dream machine, that amplified a man's imagination until he could engulf himself into a world of his own making.

Leoh envisioned it as a device to enable men to rid themselves of hostility and tension safely. Through his efforts, and those of his colleagues, dueling machines were quickly becoming accepted devices for settling disputes.

When two men had a severe difference of opinion—deep enough to warrant legal action—they could go to the dueling machine instead of the courts. Instead of sitting helplessly and watching the machinations of the law grind impersonally through their differences, the two antagonists could allow their imaginations free rein in the dueling machine. They could settle their differences personally, as violently as they wished, without hurting themselves or anyone else. On most civilized worlds, the results of properly-monitored duels were accepted as legally binding.

The tensions of civilized life could be escaped—albeit temporarily—in the dueling machine. This was a powerful tool, much too powerful to allow it to be used indiscriminately. Therefore Leoh safeguarded his invention by forming a private company—Psychonics, Inc.—and securing an exclusive license from the Terran Commonwealth to manufacture, sell, install and maintain the machines. His customers were government health and legal agencies; his responsibilities were: legally, to the Commonwealth; morally, to all mankind; and finally, to his own restless conscience.

The dueling machines succeeded. They worked as well, and often better, than Leoh had anticipated. But he knew that they were only a stopgap, only a temporarily shoring of a constantly-eroding dam. What was needed, really needed, was some method of exploding the status quo, some means of convincing people to reach out for those unoccupied, unexplored stars that filled the galaxy, some way of convincing men that they should leave the comforts of civilization for the excitement of colonization.

Leoh had been searching for that method when the news of Dulaq's duel against Odal reached him.

Now he was speeding across parsecs of space, praying to himself that the dueling machine had not failed.

The two-week flight ended. The starship took up a parking orbit around the capital planet of Acquataine Cluster. The passengers transhipped to the surface.

Dr. Leoh was met at the landing disk by an official delegation, headed by Massan, the acting prime minister. They exchanged formal greetings there at the base of the ship, while the other passengers hurried by.

As Leoh and Massan, surrounded by the other members of the delegation, rode the slideway to the port's administration building, Leoh commented:

"As you probably know, I have checked through your dueling machine quite thoroughly via tri-di for the past two weeks. I can find nothing wrong with it."

Massan shrugged. "Perhaps you should have checked then, the machine on Szarno."

"The Szarno Confederation? Their dueling machine?"

"Yes. This morning Kanus' hired assassin killed a man in it."

"He won another duel," Leoh said.

"You do not understand," Massan said grimly, "Major Odal's opponent—an industrialist who had spoken out against Kanus—was actually killed in the dueling machine. The man is dead!"

V

One of the advantages of being Commander-in-Chief of the Star Watch, the old man thought to himself, is that you can visit any planet is the Commonwealth.

He stood at the top of the hill and looked out over the green table land of Kenya. This was the land of his birth, Earth was his homeworld. The Star Watch's official headquarters may be in the heart of a globular cluster of stars near the center of the galaxy, but Earth was the place the commander wanted most to see as he grew older and wearier.

An aide, who had been following the commander at a respectful distance, suddenly intruded himself in the old man's reverie.

"Sir, a message for you."

The commander scowled at the young officer. "I gave orders that I was not to be disturbed."

The officer, slim and stiff in his black-and-silver uniform, replied. "Your chief of staff has passed the message on to you, sir. It's from Dr. Leoh, of Carinae University. Personal and urgent, sir."

The old man grumbled to himself, but nodded. The aide placed a small crystalline sphere on the grass before him. The air above the sphere started