"Do you always leave in a hurry?" she demanded, and instantly wished she hadn't said it. He gave no outward sign.

"Long-time sleep," he announced. "Four, five hours maybe." The chest strap was lying loose at his side.

"That long!" she was incredulous. "I'm never out more than three hours!" Unloosening more straps, she sat up, glanced at the control panel.

"Not taking time," he stated simply and pointed to a dial. Gray shook her head and looked at the others.

"That isn't doing either of them any good!"

Rat nodded unhappily. "What's her matter—?" pointing.

"Appendix. Something about this atmosphere sends it haywire. The thing itself isn't diseased, but it starts manufacturing poison. Patient dies in a week unless it is taken out."

"Don't know it," he said briefly.

"Do you mean to say you don't have an appendix?" she demanded.

Rat folded his arms and considered this. "Don't know. Maybe yes, maybe no. Where's it hurt?"