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“It is?” Sid Chamberlain asked, excitedly. “Then they did know about atomic energy. Just because we haven’t found any pictures of A-bomb mushrooms doesn’t mean–“

She turned to look at the other wall. Sid’s signal reactions were setting away from him again; uranium meant nuclear power to him, and the two words were interchangeable. As she studied the arrangement of the numbers and words, she could hear Tranter saying:

“Nuts, Sid. We knew about uranium a long time before anybody found out what could be done with it. Uranium was discovered on Terra in 1789, by Klaproth.”

There was something familiar about the table on the left wall. She tried to remember what she had been taught in school about physics, and what she had picked up by accident afterward. The second column was a continuation of the first: there were forty-six items in each, each item numbered consecutively–

“Probably used uranium because it’s the largest of the natural atoms,” Penrose was saying. “The fact that there’s nothing beyond it there shows that they hadn’t created any of the transuranics. A student could go to that thing and point out the outer electron of any of the ninety-two elements.”

* * * * *

Ninety-two! That was it; there were ninety-two items in the table on the left wall! Hydrogen was Number One, she knew; One, Sarfaldsorn. Helium was Two; that was Tirfaldsorn. She couldn’t remember which element came next, but in Martian it was Sarfalddavas. Sorn must mean matter, or substance, then. And davas; she was trying to think of what it could be. She turned quickly to the others, catching hold of Hubert Penrose’s arm with one hand and waving her clipboard with the other.

“Look at this thing, over here,” she was clamoring excitedly. “Tell me what you think it is. Could it be a table of the elements?”

They all turned to look. Mort Tranter stared at it for a moment.

“Could be. If I only knew what those squiggles meant–“

That was right; he’d spent his time aboard the ship.

“If you could read the numbers, would that help?” she asked, beginning to set down the Arabic digits and their Martian equivalents. “It’s decimal system, the same as we use.”

“Sure. If that’s a table of elements, all I’d need would be the numbers. Thanks,” he added as she tore off the sheet and gave it to him.

Penrose knew the numbers, and was ahead of him. “Ninety-two items, numbered consecutively. The first number would be the atomic number. Then a single word, the name of the element. Then the atomic weight–“

She began reading off the names of the elements. “I know hydrogen and helium; what’s tirfalddavas, the third one?”

“Lithium,” Tranter said. “The atomic weights aren’t run out past the decimal point. Hydrogen’s one plus, if that double-hook dingus is a plus sign; Helium’s four-plus, that’s right. And lithium’s given as seven, that isn’t right. It’s six-point nine-four-oh. Or is that thing a Martian minus sign?”

“Of course! Look! A plus sign is a hook, to hang things together; a minus sign is a knife, to cut something off from something–see, the little loop is the handle and the long pointed loop is the blade. Stylized, of course, but that’s what it is. And the fourth element, kiradavas; what’s that?”

“Beryllium. Atomic weight given as nine-and-a-hook; actually it’s nine-point-oh-two.”

Sid Chamberlain had been disgruntled because he couldn’t get a story about the Martians having developed atomic energy. It took him a few minutes to understand the newest development, but finally it dawned on him.

“Hey! You’re reading that!” he cried. “You’re reading Martian!”

“That’s right,” Penrose told him. “Just reading it right off. I don’t get the two items after the atomic weight, though. They look like months of the Martian calendar. What ought they to be, Mort?”

* * * * *