if
life still remained on Earth, it would quickly become extinct, for the
vastly increased tidal forces on that body would flood the land to the
peaks of the highest mountains. Earth would draw in closer to the sun
due to loss of velocity and increased mass of the Earth-moon system.
Tremendous new forces would rend asunder the Earth, its moon, and
Antrid. Venus and Mars, following suit as the forces equalized, we
would have a dead universe."

* * * * *

Tommy believed him. That was apparent from his furrowed brow and grim
set jaw. "I'll never give 'em the secret of the k-metal," he grated.
"Nor will Carson; I'll gamble on that. We'll die here before they'll
get it out of us."

Blaine seconded his remarks fervently. Then, turning to the Rulan
scientist, "Perhaps," he suggested, "we might remain in hiding here for
an indefinite period. Perhaps even we might contrive a way of getting
to the store of k-metal and regaining possession of it. They'd be
licked for sure then."

Dantor beamed. "That is exactly why I sent for you," he said. Then
sobering anew, he added, "But I fear that would not be the end. They
will not give up. Another emissary would be transmitted to duplicate
Antazzo's exploit on Earth and in five of your years the danger would
again be faced. They would take infinite precaution to prevent a second
failure. We must make it forever impossible--now."

"How can we? My God, it's hopeless!" Blaine groaned.

"Nothing is hopeless, my boy. Consider the plight of the Rulans. No,
there is still hope and we will leave you to think it over--if you are
willing. It is necessary that we Rulans show our faces above before we
arouse the suspicions of the guards."

"Of course we're willing. We'll stay as long as you say--and help."
Blaine was intensely earnest and Tommy chimed in with his old time
fervor and enthusiasm. But hope of success seemed remote.

A murmur of approval came from the assembled Rulans, and Dantor wiped a
trace of moisture from his tired old eyes. "Thank you," he said simply.
"This chamber is insulated from the searching rays of the crystal
spheres. You are safe for the present and will be supplied with
everything you need. And I shall return shortly to discuss the matter
in further detail."

* * * * *

The two Earth men were alone then, in the uncanny silence of the
underground retreat, regarding each other wit