sense of time, Ensign. It was my own knowledge of objective time through watching the sun, the trees, the clouds. None of them moved during my subjective hour in the host-alien. So no time—or very little time; barely a few minutes—could have passed while I was enhosted, do you see?"

"Lieutenant Norcriss," said Jana, abruptly. "I'm sorry to interrupt, but did you say clouds?"

"Yes," said Jerry, puzzled by her intensity. "Why?"

"There hasn't been a cloud in the sky today," she said awkwardly. "I mean—Well, look for yourself!"

Jerry turned his gaze upward through the quartz ceiling of the solarium. The sky, a rich turquoise, was smooth and unbroken save for the glaring gold orb of the sun, Sirius. He sat up then, looking out through the likewise transparent walls. As far as he could see, over storetops, cottage roofs, and distant green glades, the sky was that same unbroken blue.

"But that's crazy!" he said, sinking back against the pillows. "It couldn't have been like that all the time I was in Contact. Could it?"

Jana and Bob exchanged an uncomfortable look.

"Well, sir," the tech said, "we weren't exactly watching the sky, if you know what I mean. But it was clear when you went into Contact. And it's clear now."

His voice trailed off, uncertainly, but Jerry gave a slow thoughtful nod. "You're right, Ensign. It is, and it was. The likelihood of its clouding up for forty minutes, and then clearing again is so ridiculous I can't even consider it.... And yet, I saw—"

Jerry stopped speaking, and shook his head. Then he waved a hand at the tech, abstractedly. "Get me some coffee, Ensign. I have to think, hard."

When nightfall had cloaked the planet in dark purple folds, Jerry was still gazing intently at nothingness, racking his brain for an answer. Bob, meantime, had checked the card against the ship's files on dealing with alien menaces, and had found—much as both he and Jerry had suspected—that there was no recommendation available. The menace was new. It would have to be approached strictly ad libidum. Whatever method served to rid the planet of the menace would then, not before, be incorporated into the electronic memory of the brain on the ship, to serve future colonies who might meet a similar alien species.

"Any ideas, sir?" asked the tech, after a 

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