That was all, except for the waiting. To keep conditions more closely alike, they were to stay there until the tests were finished, not even eating for fear of upsetting the conditions. Swanee dug out a pack of worn cards and began to deal while Doc dug out some large pills to use as chips. It was an hour later when the pain began. Doc had just won the pot of fifty pills and opened his mouth for the expected gloating. He yelled as an explosion seemed to go off inside his head. Even closing his mouth was agony. A moment later, Tom began to sweat. It got worse, spreading to the whole area of the back of the head and neck. Doc lay on the cot, envying Chris and Swanee who had already been infected naturally. He longed desperately for bracky, and had to keep reminding himself that no drugs must upset the tests. It was the longest day he had ever spent, and he began to doubt that he could get through it. He watched the little clock move from one minute to nine over to half a minute and hung breathless until it hit the nine. There was no question about whether the infection had taken. Now they could dull the agony. Chris had the anodyne tablets already dissolved in water, and Swanee was passing out three lighted bracky weeds. It took a few minutes for the relief of the anodyne, and even that couldn't kill all the pain. But it didn't matter by comparison. He sucked the weed, mashed it out and began dealing the cards again. They had a plentiful supply of the anodyne and used it liberally during the night. The test was a speeded-up simulation of the natural course of the disease, where painkiller would take time to get for most people here, but would then be used generously. Precisely at nine in the morning, Chris began to inject Swanee and Doc with plasma. Now there was no thought of cards. They waited, trying to talk, but with most of their attention on the clock. Doc had estimated that an hour should be enough to show results, but it was hard to remember that an hour was the guess as to the minimum time. He winced as Chris took a tiny bit of flesh from his neck. She went to the other men, and then submitted to his work on herself. Then she began preparing the slides. "Feldman," she read the name of the slide as she inserted it into the microscope. Then her breath caught sharply. "Only dead cells!" It was the same for Swanee and Tom. Each had to look at his own slide and have it explained before the results could be believed. But at last Chris bent over her own slide. A minute later she glanced up, nodding. "What it should be. It checks." Tom whooped and went out the door to notify Jake. There was only plasma for some two hundred injections, but that should yield sufficient proof. Once salvation was offered, there should be no trouble convincing the people that blood donations from their children were worthwhile.