She watched as he injected half a cc. under his own skin. Then she
shivered a little.

"What will it do?"

"That remains to be seen." He paused a moment. "You and I," he said
with some dryness, "make a perfect test for anything. If you catch
something from me, it will be infectious indeed!"

She gazed at him utterly without comprehension.

He took his own temperature. He brought out the folios which were his
orders, covering each of the planets he should give a standard Medical
Service inspection. Weald was there. Dara wasn't. But a Med Service
man has much freedom of action, even when only keeping up the routine
of normal Med Service. When catching up on badly neglected operations,
he necessarily has much more. Calhoun went over the folios.

Two hours later he took his temperature again. He looked pleased. He
made an entry in the ship's log. Two hours later yet he found himself
drinking thirstily and looked more pleased still.

He made another entry in the log and matter-of-factly drew a small
quantity of blood from his own vein and called to Murgatroyd.
Murgatroyd submitted amiably to the very trivial operation Calhoun
carried out. Calhoun put away the equipment and saw Maril staring at
him with a certain look of shock.

"It doesn't hurt him," Calhoun explained. "Right after he's born
there's a tiny spot on his flank that has the pain-nerves