blueskins."

"Wh-what are blueskins?" asked the girl.

Calhoun turned around and looked at her directly.

"When lying," he said mildly, "you tell as much by what you pretend isn't, as by what you pretend is. You know what blueskins are!"

"But what do you think they are?" she asked.[33]

[33]

"There used to be a human disease called smallpox," said Calhoun. "When people recovered from it, they were usually marked. Their skin had little scar pits here and there. At one time, back on Earth, it was expected that everybody would catch smallpox sooner or later, and a large percentage would die of it.

"And it was so much a matter of course that if they printed a picture of a criminal they never mentioned it if he were pock-marked. It was no distinction. But if he didn't have the markings, they'd mention that!" He paused. "Those pock-marks weren't hereditary, but otherwise a blueskin is like a man who had them. He can't be anything else!"

"Then you think they're human?"

"There's never yet been a case of reverse evolution," said Calhoun. "Maybe Pithecanthropus had a monkey uncle, but no Pithecanthropus ever went monkey."

She turned abruptly away. But she glanced at him often during that day. He continued to busy himself with those activities which make Med Ship life consistent with retained sanity.

Next day she asked without preliminary, "Don't you believe the blueskins planned for the ship with the dead men to arrive at Weald and spread plague there?"

"No," said Calhoun.

"Why?"

"It couldn't possibly work," Calhoun told her. "With only dead men on board, the ship wouldn't arrive at a place where the landing-grid could bring it down. So that would be no good. And plague-stricken living men wouldn't try to conceal that they had the plague. They might ask for help, but they'd know they'd instantly be killed on Weald if they were found to be plague victims. So that would be no good, either! No, the ship wasn't intended to land plague on 

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