Amaryl's lips tightened, but the habit of obedience to Seldon was strong. "Yes, Hari."

But not overwhelmingly strong. He turned at the door and said, "You're making a mistake, Hari."

Seldon smiled slightly. "I don't think so, but I have heard your warning and I will not forget. Still, all will be well."

And as Amaryl left, Seldon's smile faded. Would, indeed, all be well?

But Seldon, while he did not forget Amaryl's warning, did not think of it with any great degree of concentration. His fortieth birthday came and went-with the usual psychological blow.

Forty! He was not young any longer. Life no longer stretched before him as a vast uncharted field, its horizon lost in the distance. He had been on Trantor for eight years and the time had passed quickly. Another eight years and he would be nearly fifty. Old age would be looming.

And he had not even made a decent beginning in psychohistory? Yugo Amaryl spoke brightly of laws and worked out his equations by making daring assumptions based on intuition. But how could one possibly test those assumptions? Psychohistory was not yet an experimental science. The complete study of psychohistory would require experiments that would involve worlds of people, centuries of time-and a total lack of ethical responsibility.

It posed an impossible problem and he resented having to spend any time whatever on departmental tasks, so he walked home at the end of the day in a morose mood.

Ordinarily he could always count on a walk through the campus to rouse his spirits. Streeling University was high-domed and the campus gave the feeling of being out in the open without the necessity of enduring the kind of weather he had experienced on his one (and only) visit to the Imperial Palace. There were trees, lawns, walks, almost as though he were on the campus of his old college on his home world of Helicon.