there," she said hesitantly, pointing a slim
forefinger at the huge lizard that had backed into a far corner and
was regarding them out of dull, savage eyes. Then she shook her head.
"But that is impossible. Impossible!"

* * * * *

The men stared at her, with dawning realization in their minds. Then
they gazed at each other.

"Of course," said Brand. "Of course! Greca, you're marvelous! Wish we
had a tank? Why, we've got one! A four-legged mountain of meat that
ought to be able to plow through the side of that dome like a
battering ram through cardboard!"

"But it's not possible," replied Greca, her head dropping dejectedly.
"My people, as driven slaves, till the fields with great animals that
were trapped in the surrounding jungles. They harness other great
animals to haul burdens. But none of the beasts are like _this_ one.
This kind cannot be tamed or harnessed. It is too ferocious. It is
used only as a scourge of fear, to crush us into complete submission."

"Can't be tamed?" Brand said. "We'll see about that! Come on, Dex."

"Just a minute," said Dex. He flattened against the wall, motioning
them to do the same. Then he leveled his tube at the door.

Slowly, cautiously, the door began to swing back; and the Rogan that
Dex had heard fumbling with the bolt stuck his huge head out to locate
the escaped prisoners.

Dex pressed the release coil of his tube. Without a sound, the Rogan
slumped to the ground, a smoking cavity in its shoulders at the spot
where its head had been set. In an instant the body, too, disappeared;
an upward coiling wisp of black smoke marking its vanishing.

Another Rogan, tiptoeing out, met the same fate; and another. And then
the door was banged shut again, and the bolt ground into place on the
inside.

"That'll teach 'em to be careful how they try to rush us from _that_
door," said Dex, through set teeth. "Now let's see if that tank scheme
of ours can be worked."

* * * * *

He picked up a tube dropped by one of the Rogans, and handed it to
Brand; showing him which coil to press to get full force, as Greca had
in turn informed him.

"Down the field," commanded Brand. "We'll go about thirty yards apart,
and try to herd this brute back through the walls of the dome
building. Once it's inside, we'll try to rush to the lever before the
Rogans can down us, and jam the thing past its terminal peg and into
reverse action