Iceworld

Now his face was cold, too — he must be losing radiation even through the special glass of the face plate. His tentacle tips were feeling the chill, but not so badly; the fact that the deadly whiteness had touched only the handlers, inches beyond the “inhabited” parts of the sleeve, was helping there. He had reached the edge of the area of death, and only thirty yards of bare ground lay between him and the lock. That ground was cold, too. It must be as cold as the other area; but at least it did not seem to drink heat. The lock door was open as he had left it, a metal-lined cavern that seemed to draw away as he struggled forward. He was numb below the lower knees, now; for the first time he blessed the clumsy stiffness of the armor legs, which made them feel and act like stilts, for that was all that enabled him to control the feet. Once he stumbled, and had time to wonder if he would ever be able to get the clumsy bulk erect again; then he had caught himself in some way — he never learned how, and no one on the ship could tell him — and was reeling forward again. Ten yards to go — five — two — and he brought up against the hull of the Karella with a clang. One more step and he was inside the lock. Two, and he was out of the swing of the massive door. With frantic haste he swung the sleeve of his armor at the closing switch. He hit it — hit it hard enough to bend the toggle, but the circuit was closed and the door thudded shut behind him, the sound of its closing coming through the metal of floor and suit. Then came the air, automatically, pouring into the lock chamber, condensing on the body of his armor, freezing into a yellow crust on the extremities. With the pressure up, the inner door swung wide, revealing Drai and Ordon Lee in the corridor beyond. The former shrank from the fierce chill that poured from the chamber; the pilot, thinking faster, leaped to a locker nearby and seized a welding torch. Playing the flame of this ahead of him, he approached Ken carefully.

The crust of sulfur boiled away instantly in the flame, to be replaced almost as fast when the tongue of light swung elsewhere. Long seconds passed before the metal was warm enough to stay clear, and more before it could be touched, and the almost unconscious Ken extracted. Minutes more passed before the throbbing agony receded from his limbs, and he was able to talk coherently, but at last he was satisfied that no permanent damage had been done. He had not actually been frost-bitten, though judging by the color of his skin he had come dangerously near to it.

Drai and Lee, amazed and horrified at the results of the brief sortie, felt both emotions redoubled as they heard of his plans for another. Even Drai, interested as he was in obtaining useful information, made a half- hearted attempt to dissuade him from the project. Ken refused to be dissuaded, and his employer did not have too much difficulty in consoling himself — after all, it was Ken’s health.

The instructions to bring “whatever he thought he would need” had been obeyed, and Ken spent some time searching through the pile of apparatus from the Mercurian laboratory. What he found seemed to satisfy him, and he made a number of careful preparations which involved some very precise weighing. He then carried several items of equipment to the air lock, and finally donned the armor again, to Ordon Lee’s undisguised admiration.

From the control room port, Drai and the pilot watched Ken’s hasty trip back to the scene of his earlier trouble. He followed his earlier trail, which was still clearly visible, and carefully avoided touching the whiteness with any part of his armor. Arrived at the point where his cooling boots had been unable to boil their way down to solid ground, he stopped. The watchers were unable to make out his actions in detail, but apparently he set some object on the ground, and began rolling it about as the white substance evaporated from around it. Presently this ceased to happen, as its temperature fell to that of its surroundings; then Ken appeared to pick it up and separate it into two parts. Into one of these he scooped a quantity of the mysterious stuff, using an ordinary spoon. Then the two halves of the thing were fastened together again, and the scientist beat a hasty retreat toward the air lock.

Drai was promptly headed for the inner door of the chamber, expecting to see what was going on; but the portal remained closed. He heard the hissing of air as pressure was brought up, and then nothing. He waited for some minutes, wondering more and more, and finally went slowly back to the control room. He kept looking back as he went, but the valve remained sealed.

As he entered the control room, however, Lee had something to report.

“He’s pumping the lock down again,” the pilot said, gesturing to a flaring violet light on the board. Both Sarrians turned to the port of the side toward the airlock, Lee keeping one eye on the indicator that would tell them when the outer door opened. It flashed in a matter of seconds, and the watchers crowded eagerly against the transparent panel, expecting Ken’s armored figure to appear. Again, however, nothing seemed to happen.

“What in the Galaxy is the fellow up to?” Drai asked the world at large, after a minute or so. Lee treated the question as rhetorical, but did shift part of his attention back to the control board. Even here, however, fully five minutes passed without anything occurring; then the outer door closed again. Calling Drai’s attention to this, he looked expectantly at the pressure indicator, which obediently flashed a report of rising pressure. They waited no longer, but headed down the corridor side by side.

This time Ken appeared to have finished his work; the inner door was open when they reached it. He had not permitted his suit to get so cold this time, it seemed; only a light dew dimmed its polish. Within a minute or so Lee was able to help him emerge. He was wearing a satisfied expression, which did not escape the watchers.

“You found out what it was!” Drai stated, rather than asked.

“I found out something which will let me figure out what it is, very shortly,” replied Ken.

“But what did you do? Why did you go out twice?”

“You must have seen me putting a sample into the pressure bomb. I sealed it in, and brought it inside so it would all evaporate and so that the pressure gauge on the bomb would be at a temperature where I could trust it. I read the pressure at several temperatures, and weighed the bomb with the sample. I had already weighed it empty — or rather, with the near-vacuum this planet uses for air inside it. The second time I opened the door was to let off the sample, and to make a check at the same temperature with a sample of the planet’s air — after all, it must have contributed a little to the pressure the first time.”

“But what good would all that do?”

“Without going into a lot of detail, it enabled me to find out the molecular weight of the substance. I did not expect that to be very conclusive, but as it happened I think it will be; it’s so small that there aren’t many possible elements in it — certainly nothing above fluorine, and I think nothing above oxygen. I’ll concede that I may be off a unit or so in my determination, since the apparatus and observing conditions were not exactly ideal, but I don’t think it can be much worse than that.”

“But what is it?”

“The molecular weight? Between eighteen and nineteen, I got.”

“What has that weight, though?”

“Nothing at all common. I’ll have to look through the handbook, as I said. Only the very rarest elements are that light”

“If they’re so rare, maybe the stuff is not so important for life after all.” Ken looked at Drai to see if he were serious.

“In the first place,” he pointed out, seeing that the other had not been joking, “mere rarity doesn’t prove that life doesn’t need it. We use quite respectable quantities of fluorine in our bodies, not to mention zinc, arsenic and copper. This other form of life may well do the same. In the second place, just because an element is rare on Sarr doesn’t prove it would be so on Planet Three — it’s a much bigger world, and could easily have held considerable quantities of the lighter elements during its original formation, even if they had been there as uncombined gases.” The group had been walking toward Ken’s room, where he had stored most of his apparatus, as they talked. Reaching it at this point, they entered. Ken draped himself without apology on the only rack, and began to flip through the pages of the chemical handbook, in the section devoted to inorganic compounds. He realized that his mysterious substance could contain carbon, but it certainly could not contain more than one atom per molecule, so there was no danger of its being a really complex organic material.

There were, in fact, just eight elements likely to be present; and the laws of chemistry would put considerable restriction on the possible combinations of those eight. The lightest of these was hydrogen, of course; and to the hydrogen compounds Ken turned, since they came first in that section of the handbook.

Drai had moved to a position from which he could oversee the pages that Ken was reading; the less interested or less excitable Lee stayed near the door and waited silently. He was more prepared than his employer for a long wait while the scientist made his search; and he was correspondingly more surprised when Ken, almost