as he thought.

Glover reached the hatch that opened into the ion-source chamber and started undoing the fastenings. Suddenly he turned and stared at Britten.

"Where's the new ion source?" he snapped. "Don't tell me you left it in the airlock!"

Britten stammered wordlessly, shocked out of his reverie.

"Well, of all the stupid—Go back and get it! I'll remove the old source."

Glover turned his back and continued to unfasten the hatch.

Rage came into full bloom instantly. Without an instant's thought, Britten reached out both hands, wrenched the antenna rod from Glover's back, tore his anchoring lines from their snaps, and pushed the struggling body out into space, where it soon dwindled away into a tiny speck.

CHAPTER II

Dr. Morris Wolf leaned back in his chair after Jim Britten was wheeled, asleep, from the therapy room. In a random fashion he let his mind wander over the story he had just heard, savoring not only the facts, but the feelings behind them and the intuitions which they built up in his own mind.

"Well, Alma, what do you think?" he said, swiveling his chair to look at the other doctor across his desk.

She hesitated. "The story seems satisfactory, up to a point. That is, we've broken through the memory block and have determined that Glover's death was not really an accident—which of course we suspected all along. And we have a motive—of a sort."

Wolf sighed. "Yes—the motive. The boy feels that Glover is cutting him out of the credit for an important experiment, so in a burst of anger he disposes of the professor. There are just two things that bother me about that. Look."

He switched on his desk projector and ran through the microfilm card of Britten's record until he came to the examinations which Britten had taken to get the post on the space station.

"Here we have the standard Jameson test for paranoid personality. Obviously an important item in an examination of this sort. You wouldn't send even an incipient paranoid into close quarters with a group of people for two years. And so in the case of Jim Britten the Jameson test gives a 

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