rld, he wanted to
lie down and go to sleep. He fought against the impulse. From this
threatened sleep a man would awaken all right--in the prison pen of the
Ogrum, there to wait his turn to become a sacrifice to the sun.

Two or three machine guns--no more--were still firing, holding off the
Ogrum horde. When those guns stopped--

The flames of the burning city danced in the night. The air was heavy
with smoke. The screams of the dinosaurs were louder, as if the great
beasts were excited by the conflagration in the city of the Ogrum. Craig
was vaguely aware that only two guns were firing. In spite of all his
efforts to resist the impulse, he sank to his knees. The grenades
continued to plunk on the roof. Only one gun was firing. Beside him,
Craig saw that Margy Sharp had gone quietly to sleep. She looked like a
little girl who is all tired out with play and has decided to lie down
and take a nap.

_Boom-boom! Boom-boom-boom!_

Five thudding explosions came through the night. They did not come from
the temple, or near it. They were at least half a mile away.

The sound lifted Craig to his feet.

"Michaelson!" he screamed. He tried to look in the direction from which
the sound of the explosions had come. The smoke was too heavy. He could
not see.

"Michaelson--" his voice was a whisper. "For God's sake, hurry!"

There was no answer. Craig waited. No more explosions came. He sank to
his knees, fighting against the impulse to sleep. He was dimly aware
that the screams of the Ogrum had died into abrupt silence. No more
grenades were plunking on the roof. He wondered if the Ogrum were
preparing to charge the temple, to strike down all who had strength left
to oppose them. He lifted himself up, looked over the edge.

The Ogrum were no longer watching the temple. They were staring in the
direction of the explosions. They had come out into the open. He could
see little groups of them nervously looking in the other direction.

* * * * *

Dimly, in the distance, he heard the beginning thunder of sound. It was
something like the vague roar of a starting avalanche, a rumble, a
mutter, a dim murmur growing louder. The smoke was too thick for him to
see what was happening.

The murmur grew in volume. It became as loud as the roar of a tornado.
The Ogrum stared toward it, trying to understand what it was. They were
getting nervous, now. A few of them had started to run.

Something came thr