however specialized an inimical organism, and presently some highly valuable defensive substance could be isolated from his blood and he'd remain in his usual exuberant good health.

When the antibody was analyzed by those techniques of microanalysis the Service had developed, that was that. The antibody could be synthesized and one could attack any epidemic with confidence.

The tragedy for Dara was, of course, that no Med Ship had come to Dara three generations ago, when the Dara plague raged. Worse, after the plague Weald was able to exert pres[74]sure which only a criminally incompetent Med Service director would have permitted. But criminal incompetence and its consequences was what Calhoun had been loaned to Sector Twelve to help remedy. He was not at ease, though. No ship arrived from Orede to bear out his account of an attempt to get that lonely world evacuated before Weald discovered it had blueskins on it. Maril had vanished, to visit or return to her family, or perhaps to consult with the mysterious Korvan who'd arranged for her to leave Dara to be a spy, and had advised her simply to make a new life somewhere else, abandoning a famine-ridden, despised, and out-caste world.

[74]

Calhoun had learned of two achievements the same Korvan had made for his world. Neither was remarkably constructive. He'd offered to prove the value of the second by dying of it. Which might make him a very admirable character, or he could have a passion for martyrdom, which is much more common than most people think. In two days Calhoun was irritable enough from unaccustomed hunger to suspect the worst of him.

Meanwhile Calhoun worked doggedly; in the hospitals while the patients were awake and in the Med Ship, under guard, afterward. He had hunger cramps now, but he tested a plastic cube with a thriving biological culture in it.

He worked at increasing his store of it. He'd snipped samples of pigmented skin from dead patients in the hospitals, and examined the pigmented areas, and very, very painstakingly verified a theory. It took an electron microscope to do it, but he found a virus in the blue patches which matched the type discovered on Tralee.

The Tralee viruses had effects which were passed on from mother to child, and heredity had been charged with the observed results of quasi-living viral particles. And then Calhoun[75] very, very carefully introduced into a virus culture the material he had been growing in a plastic cube. He watched what happened.

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