against one of the bunks. Asrange descended on him like an avenging angel and, holding onto the bunk with one hand, rained savage blows on his head and shoulders with the heavy stick.

Quest made no effort to retaliate. He cowered under the attack, holding his hands in front of him as if to ward it off. In a moment, Jakdane and the other crewman had reached Asrange and pulled him off.

When they had Asrange in irons, Jakdane turned to Quest, who was now sitting unhappily at the table.

“Take it easy,” he advised. “I'll wake the psychosurgeon and have him look you over. Just stay there.”

Quest shook his head.

“Don't bother him,” he said. “It's nothing but a few bruises.”

“Bruises? Man, that club could have broken your skull! Or a couple of ribs, at the very least.”

“I'm all right,” insisted Quest; and when the skeptical Jakdane insisted on examining him carefully, he had to admit it. There was hardly a mark on him from the blows.

“If it didn't hurt you any more than that, why didn't you take that stick away from him?” demanded Jakdane. “You could have, easily.”

“I couldn't,” said Quest miserably, and turned his face away.

Later, alone with Trella on the control deck, Jakdane gave her some sober advice.

“If you think you're in love with Quest, forget it,” he said.

“Why? Because he's a coward? I know that ought to make me despise him, but it doesn't any more.”

“Not because he's a coward. Because he's an android!”

“What? Jakdane, you can't be serious!”

“I am. I say he's an android, an artificial imitation of a man. It all figures.

“Look, Trella, he said he was born on Jupiter. A human could stand the gravity of Jupiter, inside a dome or a ship, but what human could stand the rocket acceleration necessary to break free of Jupiter? Here's a man strong enough to break a spaceship safety belt just by getting up out of his chair against it, tough enough to take a beating with a heavy stick without being injured. How can you believe he's really human?”

Trella remembered the thug Kregg striking Quest in the face and then crying that he had injured his hand on the bar.

“But he said Dr. Mansard was his father,” protested Trella.

“Robots and androids frequently look on their makers as their parents,” said Jakdane. “Quest may not even know he's artificial. Do you know how Mansard died?”

“The oxygen equipment failed, Quest said.”

“Yes. Do you know when?”

“No. Quest never did tell me, that I remember.”

“He told me: a year before Quest made his rocket flight to Ganymede! If the oxygen equipment failed, how do you think Quest lived in the poisonous atmosphere of Jupiter, if he's human?”

Trella was silent.

“For the protection of humans, there are two psychological traits built into every robot and android,” said Jakdane gently. “The first is that they can never, under any circumstances, attack a human being, even in self defense. The second is that, while they may understand sexual desire objectively, they can never experience it themselves.

“Those characteristics fit your man Quest to a T, Trella. There is no other explanation for him: he must be an android.”

Trella did not want to believe Jakdane was right, but his reasoning was unassailable. Looking upon Quest as an android, many things were explained: his great strength, his short, broad build, his immunity to injury, his refusal to defend himself against a human, his inability to return Trella's love for him.

It was not inconceivable that she should have unknowingly fallen in love with an android. Humans could love androids, with real affection, even knowing that they were artificial. There were instances of android nursemaids who were virtually members of the families owning them.

She was glad now that she had not told