"Look, Hari," he said, chopping at the air with his left hand, "for some reason that is beyond my understanding, you think highly of this Demerzel, but I don't. No one whose opinion I respect-except you-thinks well of him. I don't care what happens to him personally, Hari, but as long as I think you do, I have no choice but to bring this to your attention."

Seldon smiled, as much at the other's earnestness as at what he considered to be the uselessness of his concern. He was fond of Yugo Amaryl-more than fond. Yugo was one of the four people he had encountered during that short period of his life when he was in flight across the face of the planet Trantor-Eto Demerzel, Dors Venabili, Yugo Amaryl, and Raych-four, the likes of which he had not found since.

In a particular and, in each case, different way, these four were indispensable to him-Yugo Amaryl, because of his quick understanding of the principles of psychohistory and of his imaginative probings into new areas. It was comforting to know that if anything happened to Seldon himself before the mathematics of the field could be completely worked out-and how slowly it proceeded, and how mountainous the obstacles there would at least remain one good mind that would continue the research.

He said, "I'm sorry, Yugo. I don't mean to be impatient with you or to reject out of hand whatever it is you are so anxious to make me understand. It's just this job of mine; it's this business of being a department head-"

Amaryl found it his turn to smile and he repressed a slight chuckle. "I'm sorry, Hari, and I shouldn't laugh, but you have no natural aptitude for the position."

"As well I know, but I'll have to learn. I have to seem to be doing something harmless and there is nothing-nothing-more harmless than being the head of the Mathematics Department at Streeling University. I can fill