"All right, all right! We will accept the abbreviated name you have used on Hospital Earth. Let it be clear on the record that the applicant is a native of the second planet of the Garv system." The Black Doctor settled back in his chair and began whispering again to the Blue Doctor next to him. A Green Doctor cleared his throat. "Doctor Timgar, what do you consider to be the basic principle that underlies the work and services of physicians of Hospital Earth?" It was an old question, a favorite on freshman medical school examinations. "The principle that environments and life forms in the universe may be dissimilar, but that biochemical reactions are universal throughout creation," Dal said slowly. "Well memorized," Black Doctor Tanner said sourly. "What does it mean?" "It means that the principles of chemistry, physiology, pathology and the other life sciences, once understood, can be applied to any living creature in the universe, and will be found valid," Dal said. "As different as the various life forms may be, the basic life processes in one life form are the same, under different conditions, as the life processes in any other life form, just as hydrogen and oxygen will combine to form water anywhere in the universe where the proper physical conditions prevail." "Very good, very good," the Green Doctor said. "But tell me this: what in your opinion is the place of surgery in a Galactic practice of medicine?" A more difficult question, but one that Dal's training had prepared him well to answer. He answered it, and faced another question, and another. One by one, the doctors interrogated him, Black Doctor Arnquist among them. The questions came faster and faster; some were exceedingly difficult. Once or twice Dal was stopped cold, and forced to admit that he did not know the answer. Other questions which he knew would stop other students happened to fall in fields he understood better than most, and his answers were full and succinct. But finally the questioning tapered off, and the White Doctor shuffled his papers impatiently. "If there are no further medical questions, we can move on to another aspect of this student's application. Certain questions of policy have been raised. Black Doctor Tanner had some things to say, I believe, as co-ordinator of medical education." The Black Doctor rose ponderously to his feet. "I have some things to say, you can be sure of that," he said, "but they have nothing to do with this Dal Timgar's educational qualifications for assignment to a General Practice Patrol ship." Black Doctor Tanner paused to glare in Dal's direction. "He has been trained in a medical school on Hospital Earth, and apparently has passed his final qualifying examinations for the Red Service of Surgery. I can't argue about that." Black Doctor Arnquist's voice came across the room. "Then why are we having his review, Hugo? Dal Timgar's classmates all received their assignments automatically."