ow of a little hill and the mob is down below.
They're laughing at him and shooting. They almost look like college
students. He's down--they got him."

A choking sob caught the operator's voice. "That's all there is," he
said. "I hope you can do something with the information Dr. French gave
you yesterday. Berkeley is finished. I'm going to try to get out of here
myself now. I don't think I stand much of a chance. The mobs are
swarming all over the campus. I can hear the fire on the other side of
the building. Maybe I won't even make it outside. Tell the Professor and
Ken so long. I sure wish I could have made it to Mayfield to see what
goes with that Swedish accent. 73 YL."

* * * * *

After dinner, Professor Maddox announced his intention of going back to
the laboratory. Mrs. Maddox protested vigorously.

"I couldn't sleep even if I went to bed," he said, "thinking about
what's happened today in Berkeley."

"What if a thing like that happened here?" Mrs. Larsen asked with
concern. "_Could_ it?"

"We're in a much better position than the metropolitan areas," said
Professor Maddox. "I think we'll manage if we can keep our people from
getting panicky. It's easier, too, because there aren't so many of us."

Professor Larsen went back to the laboratory with the Maddoxes.
Throughout the night they reviewed the work of Dr. French. To Ken it
seemed that they were using material out of the past, since all of those
responsible for it were probably dead.

"We'll have to fill in these missing steps," said Professor Maddox. "We
know what he started with and we know the end results at which he was
aiming. I think we can fill the gaps."

"I agree," said Professor Larsen. "I think we should not neglect to
pass this to our people in Stockholm. You will see that is done?" he
asked Ken.

"Our next schedule in that area is day after tomorrow. Or I could get it
to them on the emergency watch tomorrow afternoon."

"Use emergency measures. I think it is of utmost importance that they
have this quickly."

* * * * *

As the days passed, strangers were appearing more and more frequently in
Mayfield. Ken saw them on the streets as he went to the warehouse for
his family's food ration. He did not know everyone who lived in the
valley, of course, but he was sure some of the people he was meeting now
were total strangers, and there seemed so many of them.

He had heard