"What's the Esaron Sector like?" Dalla asked, as the conveyer dome
around them coruscated with shifting light and vanished.
"Third Level; probability of abortive attempt to colonize this planet
from Mars about a hundred thousand years ago," he said. "A few
survivors--a shipload or so--were left to shift for themselves while
the parent civilization on Mars died out. They lost all vestiges of
their original Martian culture, even memory of their extraterrestrial
origin. About fifteen hundred to two thousand years ago, a reasonably
high electrochemical civilization developed and they began working
with nuclear energy and developed reaction-drive spaceships. But
they'd concentrated so on the inorganic sciences, and so far neglected
the bio-sciences, that when they launched their first ship for Venus
they hadn't yet developed a germ theory of disease."
"What happened when they ran into the green-vomit fever?" Dalla asked.
"About what you could expect. The first--and only--ship to return
brought it back to Terra. Of course, nobody knew what it was, and
before the epidemic ended, it had almost depopulated this planet.
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