protested. “A ship has to be magnetic to drive!”

“Sir,” said Baird, his voice still shaken, “they don’t use a magnetronic drive. I once saw a picture of the drive they use, in a stereo on the history of space travel. The principle’s very old. We’ve practically forgotten it. It’s a Dirac pusher-drive, sir. Among us humans, it came right after rockets. The planets of Sol were first reached by ships using Dirac pushers. But—” He paused. “They won’t operate in a magnetic field above seventy Gauss, sir. It’s a static-charge reaction, sir, and in a magnetic field it simply stops working.”

The skipper regarded Baird unwinkingly for a long time.

“I think you are telling me,” he said at long last, “that the Plumies’ drive would work if they were cut free of the Niccola.”

“Yes, sir,” said Baird. “Their engineers were opening up the drive-elements and checking them, and then closing them up again. They couldn’t seem to find anything wrong. I don’t think they know what the trouble is. It’s the Niccola’s magnetic field. I think it was our field that caused the collision by stopping their drive and killing all their controls when they came close enough.”

“Did you tell them?” demanded the skipper.

“There was no easy way to tell them by diagrams, sir.”

Taine’s voice cut in. It was feverish. It was strident. It was triumphant.

“Sir! The Niccola is effectively a wreck and unrepairable. But the Plumie ship is operable if cut loose. As weapons officer, I intend to take the Plumie ship, let out its air, fill its tanks with our air, start up its drive, and turn it over to you for navigation back to base!”

Baird raged. But he said coldly:

“We’re a long way from home, Mr. Taine, and the Dirac pusher drive is slow. If we headed back to base in the Plumie ship with its Dirac pusher, we’d all be dead of old age before we’d gone halfway.”

“But unless we take it,” raged Taine, “we hit this sun in fourteen days! We don’t have to die now! We can land on the oxygen planet up ahead! We’ve only to kill these vermin and take their ship, and we’ll live!”

Diane’s voice said dispassionately:

“Report. A Plumie in a pressure suit just came out of their air lock. It’s carrying a parcel toward our air 

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