He yanked out his bunk and slumped into it, curling up as much as the itching would permit. And finally, for the first time in over fifty hours, he managed to doze off, though his sleep was full of nightmares.

It was the sound of the bull-throated chemical rocket that brought him out of it—the sound traveling along the surface through the rocks and up through the metal ship, even without air to carry it.

He could feel the rumble of its takeoff later, but he waited long after that for the doctor. There was no knock on the port. Finally he pulled himself up from the bunk, sweating and shaken, and looked out.

The doctor was there—or at least a man in a spacesuit was. But somebody had been in a hurry for volunteers, and given the man no basic training at all. The figure would pull itself erect, make a few strides that were all bounce and no progress, and then slide down into the pumice. Moon-walking was tricky until you learned how.

Bill sighed, scratching unconsciously, and made his way somehow out to his suit, climbing into it. He paused for a final good scratch, and then the grapples took over. This time, he stumbled also as he made his way across the powdery rubble. But the other man was making no real progress at all.

Bill reached him, and touched helmets long enough to issue simple instructions through metal sound conduction. Then he managed to guide the other's steps; there had been accounts of the days of learning spent by the first men on the Moon, but it wasn't that bad with an instructor to help. The doctor picked up as they went along. Bill's legs were buckling under him by then, and the itches were past endurance. At the end, the doctor was helping him. But somehow they made the ship, and were getting out of the suits—Bill first, then the doctor, using the grapples under Bill's guidance.

The doctor was young, and obviously scared, but fighting his fear. He'd been picked for his smallness to lighten the load on the chemical rocket, and his little face was intent. But he managed a weak grin.

"Thanks, Adams. I'm Doctor Ames—Ted to you. Get onto that cot. You're about out on your feet."

The test he made didn't take long, but his head was shaking at the conclusion.

"Your symptoms make no sense," he summarized. "I've got a feeling some are due to one thing, some to another. Maybe we'll have to wait until I come down with it and compare notes."