“Tell us more about this,” an officer in gold braid said. “It’s such an unusual concept.”

“Is there really a human brain inside the ship?” a dignitary asked, a small man in a rumpled suit. “And the brain is actually alive?”

“Gentlemen, this ship is guided by a living brain instead of the usual Johnson relay-control system. But the brain is not conscious. It will function by reflex only. The practical difference between it and the Johnson system is this: a human brain is far more intricate than any man-made structure, and its ability to adapt itself to a situation, to respond to danger, is far beyond anything that could be artificially built.”

Gross paused, cocking his ear. The turbines of the ship were beginning to rumble, shaking the ground under them with a deep vibration. Kramer was standing a short distance away from the others, his arms folded, watching silently. At the sound of the turbines he walked quickly around the ship to the other side. A few workmen were clearing away the last of the waste, the scraps of wiring and scaffolding. They glanced up at him and went on hurriedly with their work. Kramer mounted the ramp and entered the control cabin of the ship. Winter was sitting at the controls with a Pilot from Space-transport.

“How’s it look?” Kramer asked.

“All right.” Winter got up. “He tells me that it would be best to take off manually. The robot controls—” Winter hesitated. “I mean, the built-in controls, can take over later on in space.”

“That’s right,” the Pilot said. “It’s customary with the Johnson system, and so in this case we should—”

“Can you tell anything yet?” Kramer asked.

“No,” the Pilot said slowly. “I don’t think so. I’ve been going over everything. It seems to be in good order. There’s only one thing I wanted to ask you about.” He put his hand on the control board. “There are some changes here I don’t understand.”

“Changes?”

“Alterations from the original design. I wonder what the purpose is.”

Kramer took a set of the plans from his coat. “Let me look.” He turned the pages over. The Pilot watched carefully over his shoulder.

“The changes aren’t indicated on your 

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