LITMIR.BIZ

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      He grabbed the unconscious man’s right hand and shoved his right thumb up against the sensor plate in the front of the metal box next to the bed. He could have gotten the master key from Colonel Fennister, but he hadn’t the time.

      The box door dilated open, and Dr. Smathers looked inside.

      When he came across the bottles, he swore under his breath, then flung the spaceman’s arm down and ran from the room.

      * * * *

      “That’s where he was getting his vitamins, then,” said Dr. Pilar as he looked over the assortment of bottles that he and Smathers had taken from the locker box. “Look at ’em. He’s got almost as many pills as you have.” He looked up at the physician. “Do you suppose it was just vitamins that kept him going?”

      “I don’t know,” said Smathers. “I’ve given him massive doses of every one of the vitamins—from my own supplies, naturally. He may rally round, if that’s what it was. But why would he suddenly be affected by the stuff now?”

      “Maybe he quit taking them?” Pilar made it half a question.

      “It’s possible,” agreed Smathers. “A hypochondriac will sometimes leave off dosing himself if there’s a doctor around to do it for him. As long as the subconscious need is filled, he’s happy.” But he was shaking his head.

      “What’s the matter?” Pilar asked.

      Smathers pointed at the bottles. “Some of those are mislabeled. They all say vitamins of one kind or another on the label, but the tablets inside aren’t all vitamins. MacNeil’s been giving himself all kinds of things.”

      Pilar’s eyes widened a trifle. “Do you suppose—”

      “That one of them is an antidote?” Smathers snorted. “Hell, anything’s possible at this stage of the game. The best thing we can do, I think, is give him a dose of everything there, and see what happens.”

      * * * *

      “Yeah, Doc, yeah,” said MacNeil smiling weakly, “I feel a little better. Not real good, you understand, but better.”

      Under iron control, Dr. Smathers put on his best bedside manner, while Pilar and Petrelli hovered in the background.

      “Now, look, son,” said Smathers in a kindly voice, “we found the medicines in your locker box.”

      MacNeil’s face fell, making him look worse. He’d dropped down close to death before the conglomerate mixture which had been pumped into his stomach had taken effect, and Smathers had no desire to put too much pressure on the man.

      “Now, don’t worry about it, son,” he said hurriedly. “We’ll see to it that you aren’t punished for it. It’s all right. We just want to ask you a few questions.”

      “Sure, Doc; anything,” said MacNeil. But he still looked apprehensive.

      “Have you been dosing yourself pretty regularly with these things?”

      “Well…uh…well, yeah. Sometimes.” He smiled feebly. “Sometimes I didn’t feel so good, and I didn’t want to bother the medics. You know how it is.”

      “Very considerate, I’m sure,” said Smathers with just the barest trace of sarcasm, which, fortunately, fell unheeded on MacNeil’s ears. “But which ones did you take every day?”

      “Just the vitamins.” He paused. “And…uh…maybe an aspirin. The only things I took real regular were the vitamins, though. That’s all right ain’t it? Ain’t vitamins food?”

      “Sure, son, sure. What did you take yesterday morning, before you got so sick?”

      “Just the vitamins,” MacNeil said stoutly. “I figured that since you docs was takin’ care of me, I didn’t need no medicine.”

      Dr. Smathers glanced up hopelessly at the other two men. “That eliminates the vitamins,” he said, sotto voce. He looked back at the patient. “No aspirin? No APC’s? You didn’t have a headache at all?”

      MacNeil shook his head firmly. “I don’t get headaches much.” Again he essayed a feeble smile. “I ain’t like you guys, I don’t overwork my brains.”

      “I’m sure you don’t,” said Smathers. Then his eyes gleamed. “You have quite a bit of stomach trouble, eh? Your digestion bad?”

      “Yeah. You know; I told you about it. I get heartburn and acid stomach pretty often. And constipation.”

      “What do you take for that?”

      “Oh, different things. Sometimes a soda pill, sometimes milk of magnesia, different things.”

      Smathers looked disappointed, but before he could say anything, Dr. Petrelli’s awed but excited voice came from behind him. “Do you take Epsom salts?”

      “Yeah.”

      “I wonder—” said Petrelli softly.

      And then he left for the lab at a dead run.

      * * * *

      Colonel Fennister and Major Grodski sat at the table in the lab, munching on banana-pears, blissfully enjoying the sweet flavor and the feeling of fullness they were imparting to their stomachs.

      “MacNeil can’t stay in the service, of course,” said Fennister. “That is, not in any space-going outfit. We’ll find an Earthside job for him, though. Maybe even give him a medal. You sure these things won’t hurt us?”

      Dr. Pilar started to speak, but Petrelli cut him off.

      “Positive,” said the chemist. “After we worked it out, it was pretty simple. The ‘poison’ was a chelating agent, that’s all. You saw the test run I did for you.”

      The colonel nodded. He’d watched the little chemist add an iron salt to some of the fruit juice and seen it turn red. Then he’d seen it turn pale yellow when a magnesium salt was added. “But what’s a chelating agent?” he asked.

      “There are certain organic compounds,” Dr. Petrelli explained, “that are…well, to put it simply, they’re attracted by certain ions. Some are attracted by one ion, some by another. The chelating molecules cluster around the ion and take it out of circulation, so to speak; they neutralize it, in a way.

      “Look, suppose you had a dangerous criminal on the loose, and didn’t have any way to kill him. If you kept him surrounded by policemen all the time, he couldn’t do anything. See?”

      The Space Service Officers nodded their understanding.

      “We call that ‘sequestering’ the ion,” the chemist continued. “It’s used quite frequently in medicine, as Dr. Smathers will tell you. For instance, beryllium ions in the body can be deadly; beryllium poisoning is nasty stuff. But if the patient is treated with the proper chelating agent, the ions are surrounded and don’t do any more damage. They’re still there, but now they’re harmless, you see.”

      “Well, then,” said the colonel, “just what did this stuff in the fruit do?”

      “It sequestered the iron ions in the body. They couldn’t do their job. The body had to quit making hemoglobin, because hemoglobin needs iron. So, since there was no hemoglobin in the bloodstream, the patient developed sudden pernicious anemia and died of oxygen starvation.”

      Colonel Fennister looked suddenly at Dr. Smathers. “I thought you said the blood looked normal.”

      “It did,” said the physician. “The colorimeter showed extra hemoglobin, in fact. But the chelating agent in the fruit turns red when it’s connected up with iron—in fact, it’s even redder than blood hemoglobin. And the molecules containing the sequestered iron tend to stick to the outside of the red blood cells, which threw the whole test off.”

      “As I understand it, then,” said Major Grodski, “the

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