"Where did they come from?" Matt asked.
"The river. That's a specimen of river water." The fat man pointed at the bottle. "I tell you, Salt River and the Ohio are alive with these organisms. Have you ever seen anything like them before?"
The three men shook their heads.
"What do you think, Jesse?" Matt asked the biologist.
"What do I think? I think they're the first evolutionary step of the life spores that invaded Earth!"
"The life spores?"
The fat man nodded emphatically, crinkling an extra chin. "An alien life form starting up the evolutionary ladder. I'm positive that they're neither plant nor animal...."
"Then what are they?" Matt interrupted.
Jesse Sawyer shrugged fat shoulders. "I don't know. I want Frazer to analyze them if he can."
"An alien life form!" said Matt speculatively. "Two dominant life forms on the same planet...." He broke off as the eerie wail of sirens rent the building.