came from Zeta Aurigae, they told him, and was the second foreign ship to visit Sol. Most of the crew had been ferried down to Earth, where they were inspecting the people (without approval, Weaver was sure). Meanwhile, the remaining crewman would be pleased to have the sanatorium party inspect him.

They went aboard, Harriet and two other women, and six men counting the guide and Weaver. The ship was a red-lit cavern. The "crewman" turned out to be a hairy horror, a three-foot headless lump shaped like an eggplant, supported by four splayed legs and with an indefinite number of tentacles wriggling below the stalked eyes.

"They're more like us than you'd think," said the guide. "They're mammals, they have a nervous organization very like ours, they're susceptible to some of our diseases—which is very rare—and they even share some of our minor vices." He opened his kit and offered the thing a plug of chewing tobacco, which was refused with much tentacle-waving, and a cigar, which was accepted. The creature stuck the cigar into the pointed tip of its body, just above the six beady black eyes, lit it with some sort of flameless lighter, and puffed clouds of smoke like a volcano.

"—And of course, as you see, they're oxygen breathers," the guide finished. "The atmosphere in the ship here is almost identical to our own—we could breathe it without any discomfort whatever."

Then why don't we? Weaver thought irritably. He had been forced to wear either a breathing mask or a pressure suit all the time he had been on the Moon, except when he had been in his own sealed room at the sanatorium. And his post-nasal drip was unmistakably maturing into a cold; he had been stifling sneezes for the last half hour.

He was roused by a commotion up ahead; someone was on the floor, and the others were crowding around. "Help me carry her," said the guide's voice sharply in his earphones. "We can't treat her here. What is she, a heart case?... Good Lord. Clear the way there, will you?"

Weaver hurried up, struck by a sharp suspicion. Indeed, it was Harriet who was being carried out—and a good thing, he thought, that they didn't have to support her full weight. He wondered vaguely if she would die before they got her to a doctor. He could not give the thought his full attention, or feel as much fraternal anxiety as he ought, because—

He had ... he had to sneeze.

The others had crowded out into the red-lit space of the 

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