The voice from the _Candida_ said hopefully: "Can you authorize us to refuse to land our passenger for his own protection? He's raising the devil! He insists that his business demands that he be landed." A word from Calhoun as a Med Service man would protect the spaceliner from a claim for damages. But Calhoun didn't like the look of things. He realized, distastefully, that he might find practically anything down below. He might find that he had to quarantine the planet and himself with it. In such a case he'd need the _Candida_ to carry word of the quarantine to other planets and thus to Med Service sector headquarters. "We've lost a lot of time," insisted the _Candida_. "Can you authorize us--" "Not yet," said Calhoun. "I'll tell you when I land." "But--" "I'm signing off for the moment," said Calhoun. "Stand by." He headed the little ship downward, and as it gathered velocity he went over the briefing sheets covering this particular world. He'd never touched ground here before. His occupation, of course, was seeing to the dissemination of medical science as it developed under the Med Service. The Service itself was neither political nor administrative. But it was important. Every human-occupied world was supposed to have a Med Ship visit at least once in four years to verify the state of public health. Med Ship men like Calhoun offered advice on public-health problems. When something out of the ordinary turned up, the Med Service had a staff of researchers who hadn't been wholly baffled yet. There were great ships which could carry the ultimate in laboratory equipment and specialized personnel to any place where they were needed. Not less than a dozen inhabited worlds in this sector alone owed the survival of their populations to the Med Service, and the number of those which couldn't have been colonized without Med Service help was legion. Calhoun reread the briefing. Maya was one of four planets in this general area whose life systems seemed to have had a common origin, suggesting that the Arrhenius theory of space-traveling spores was true in some limited sense. A genus of ground-cover plants with motile stems and leaves and cannibalistic tendencies was considered strong evidence of common origin.