millimeter. Believe me, that's some tolerance on an object of this size. The surfaces are of number fifteen smoothness, which means they are plane within a hundred-thousandth of a millimeter. The implications are obvious. The builders who constructed that were mechanical geniuses."

"Did you get any radioactive dating?"

"Rather doubtfully, but the indications are around half a million years."

"That checks with what we know about the Stroids."

"It would appear that their culture is about on a par with our own."

"Personally, I think they were ahead of us," said Terry. "And do you see what that means to us archeologists? It's the first time in the history of the science that we've had to deal with the remains of a civilization either equal or superior to our own. The problems are multiplied a thousand times when you try to take a step up instead of a step down."

"Any idea of what the Stroids looked like?"

"We haven't found any bodies, skeletons, or even pictures, but we think they were at least roughly anthropomorphic. They were farther from the Sun than we, but it was younger then and probably gave them about the same amount of heat. Their planet was larger and the Stroids appear to have been somewhat larger as individuals than we, judging from the artifacts we've discovered. But they seem to have had a suitable atmosphere of oxygen diluted with appropriate inert gases."

They were interrupted by the sudden appearance of a laboratory technician who brought in a dry photographic print still warm from the developing box.

He laid it on the desk before Underwood. "I thought you might be interested in this."

Underwood and Terry glanced at it. The picture was of the huge, gemlike artifact, but a number of the facets seemed to be covered with intricate markings of short, wavy lines.

Underwood stared closer at the thing. "What the devil are those? We took pictures of every facet previously and there was nothing like this. Get me an enlargement of these."

"I already have." The assistant laid another photo on the desk, showing the pattern of markings as if at close range. They were clearly discernible now.

"What do you make of it?" asked Underwood.

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