Doctor Kessler peered at him through the microscreen. It gave his face a narrow insubstantial appearance. The microscreen was a hemispherical force field enclosing his head. It originated in a tubular circlet that snapped around his throat at the top of the decontagion suit. The field killed all microlife that passed through it or came in contact with it. The decontagion suit was non-porous and impermeable, covering completely the rest of his body. The material was thinner over his hands and thicker at the soles.

Bolden took in the details at a glance. "Is it serious?" he asked, his voice cracking with the effort.

"Merely a precaution," said the doctor hollowly. The microscreen distorted sound as well as sight. "Merely a precaution. We know what it is, but we're not sure of the best way to treat it."

Bolden grunted to himself. The microscreen and decontagion suit were strong precautions.

The doctor wheeled a small machine from the wall and placed Bolden's hand in a narrow trough that held it steady. The eyepiece slid into the microscreen and, starting at the finger tips, Kessler examined the arm, traveling slowly upward. At last he stopped. "Is this where feeling ends?"

"I think so. Touch it. Yeah. It's dead below there."

"Good. Then we've got it pegged. It's the Bubble Death."

Bolden showed concern and the doctor laughed. "Don't worry. It's called that because of the way it looks through the X-ray microscope. It's true that it killed the scouting expedition that discovered the planet, but it won't get you."

"They had antibiotics. Neobiotics, too."