was sent out that Kendall was on the right track after all. In two hours
the apparatus had been vastly altered, it was in the final stage, and an
entirely different sort of field set up. Again they watched as Buck
applied the power.

The atostor hummed--but no strange tricks of matter happened this time.
The more concentrated, altered field was, as Buck was to find out later,
"Uncertainty of the Second Degree." It was molecular uncertainty. In a
field a foot and a half in diameter, Buck saw the thing created--and
suddenly a brilliant green-blue flame shot up, and a great dark cloud of
terrible, red-brown deadly vapor. Then an instant later, Kendall had
opened the relay. Gasping, the men ran from the laboratory, shutting the
deadly fumes in. "N{2}O{4}" gasped Morton, the chemist, as they reached
safety. "It's exothermic--but it formed there!"

In that instant, Kendall grasped the meaning the choking fumes carried.
"Molecular uncertainty!" he decided. "We're going back--we're getting
there--"

He altered the apparatus again, added another atostor in series, reduced
the size of his sphere of forces--of strange chaos of uncertainty.
Within--little was certain. Without--the laws of nature applied as ever.

Again the apparatus was started, cautiously this time. Only a strange
jumbled ionization appeared this time, then a slow, rising blue flame
began to creep up, and burn hot and blue. Buck looked at it for a
moment, then his face grew tense and thoughtful. "Devin--give me a
half-dollar." Blankly, Devin reached in his pocket, and handed over the
metal disc. Cautiously Buck Kendall tossed it toward the sphere of
force. Instantly there was a flash of flame, soundless and soft-colored.
Then the silver disc was outlined in light, and swiftly, inevitably
crumbling into dust so fine only a blue haze appeared. In less than two
seconds, the metal was gone. Only the dense blue fog remained. Then this
began to go, and the leaping blue flame grew taller, and stronger.

"We're on the track--I'm going to stop here, and calculate. Bring the
data--"

Kendall shut off the machine, and went to the calculation room. Swiftly
he selected already prepared graphs, graphs of the math he had worked
on. Devin came soon, and others. They assembled the data and with tables
and arithmetical machines turned it into graphs.

Then all these graphs were fed into the machine. There were curves, and
sine-curves, abrupt breaking lines--but the answer t