, or at miles a second, into the ship itself! But these ships
would require long hours, days, even weeks to build, and in that time
the Kaxorian fleet would be ready. It would attack Earth within six days
now! What hope was there to avert incalculable destruction--if not
outright defeat?

In despair Arcot turned and strode quickly down the long hallway of the
_Solarite_. Above him he could hear the smooth, even hum of the sweetly
functioning generator, but it only reminded him of the vastly greater
energies he had seen controlled that night. The thudding relays in the
power room, as Wade maneuvered the ship, seemed some diminutive mockery
of the giant relays he had seen in the power room of the Kaxorian plane.

He sat down in the power room, looking at the stacked apparatus, neatly
arranged, as it must be, to get all this apparatus in this small space.
Then at last he began to think more calmly. He concentrated on the
greatest forces known to man--and there were only two that even occurred
to him as great! One was the vast energies he had that very night
learned of; the other was the force of the molecules, the force that
drove his ship.

He had had no time to work out the mathematics of the light compression,
mathematics that he now knew would give results. There remained only the
molecular motion. What could he do with it that he had not done?

He drew out a small black notebook. In it were symbols, formulas, and
page after page of the intricate calculus that had ended finally in the
harnessing of this great force that was even now carrying him smoothly
along.

Half an hour later he was still busy--covering page after page with
swiftly written formulas. Before him was a great table of multiple
integers, the only one like it known to exist in the System, for the
multiple calculus was an invention of Arcot's. At last he found the
expression he wanted, and carefully he checked his work, excitedly
though now, with an expression of eager hope--it seemed logical--it
seemed correct--

"Morey--oh, Morey," he called, holding his enthusiasm in check, "if you
can come here--I want you to check some math for me. I've done it--and I
want to see if you get the same result independently!" Morey was a more
careful mathematician than he, and it was to him Arcot turned for
verification of any new discovery.

Following the general directions Arcot gave him, Morey went through the
long series of calculations--and arrived at the s