“Their descendants are still there, completely adapted to the environment. Their body temperatures are around a hundred and thirty degrees. They have specialized tissue in the gluteus area for storing water. These are minor changes, compared to the major ones they have done in fitting themselves for this planet. I don’t know the exact details, but the reports are very enthusiastic about symbiotic relationships. They assure us that this is the first time homo sapiens has been an active part of either commensalism or inquilinism other than in the role of host.”

“Wonderful!” Lea exclaimed.

“Is it?” Ihjel scowled. “Perhaps from the abstract scientific point of view. If you can keep notes perhaps you might write a book about it some time. But I’m not interested. I’m sure all these morphological changes and disgusting intimacies will fascinate you, Dr. Morees. But while you are counting blood types and admiring your thermometers, I hope you will be able to devote a little time to a study of the Disans’ obnoxious personalities. We must either find out what makes these people tick—or we are going to have to stand by and watch the whole lot blown up!”

“Going to do what?” Lea gasped. “Destroy them? Wipe out this fascinating genetic pool? Why?”

“Because they are so incredibly loathsome, that’s why!” Ihjel said. “These aboriginal hotheads have managed to lay their hands on some primitive cobalt bombs. They want to light the fuse and drop these bombs on Nyjord, the next planet. Nothing said or done can convince them differently. They demand unconditional surrender, or else.