the blue patches. And you'd separate, and take ships that went various
roundabout ways, and arrive on Weald one by one, to see what could be
done there to--" He stopped. "When did you find out positively that
there wasn't any plague any more?"

She began to grow pale.

"I'm not a mind reader," said Calhoun. "But it adds up. You're from
Dara. You've been on Weald. It's practically certain that there are
other ... agents, if you like that word better, on Weald. And there
hasn't been a plague on Weald so you people aren't carriers of it. But
you knew it in advance, I think. How'd you learn? Did a ship in some
sort of trouble land there, on Dara?"

"Y--yes," said the girl. "We wouldn't let it go again. But the people
didn't catch--they didn't die. They lived--"

She stopped short.

"It's not fair to trap me!" she cried passionately. "It's not fair!"

"I'll stop," said Calhoun.

He turned to the control board. The Med Ship was only planetary
diameters from Orede, now, and the electron telescope showed shining
stars in leisurely motion across its screen. Then a huge, gibbous
shining shape appeared, and there were irregular patches of that muddy
color which is seabottom, and varicolored areas which were plains and
forests. Also there were mountains. Calhoun steadied the image, and
squinted at it.