bers at Vaaka-hausen. Thanks to my good friend Sands, I also
know the location of the invisible city. That, too, I will attend to.
But all in good time. Guards! Bind and gag the prisoners...."

He never finished the sentence. There was a sharp hiss, and a thud. A
narrow steel point stood a hand's breadth out beyond his throat. A
wondering expression came into his eyes. Then his knees buckled, and he
went down on the trampled grass. Across the garden, still holding the
air-gun from which he had shot the long steel slug, stood Sarnak of
Luralla!

* * * * *

The Scaly Ones went for their weapons, but a vengeful throng of the
outlaw brood of the Dragon came pouring up from below on the heels of
their leaders. There was no thought of quarter between these hereditary
foes. There was a short, sharp fight--and then the last of Lansa's
raiding party died in the shadow of the wall. Sarnak came striding
forward, his hand outstretched and a cheerful smile on his broad face.

"It seems that I came in very good time, my friends!" he said.

"Perfect," Gerry grinned. "But what does your coming mean?"

"It means that the hour of deliverance is at hand. When Lansa brought
his full force eastward against Savissa, it gave us the opportunity we
have been needing for generations. We of the Dragon's Teeth rose against
the scanty garrisons he left behind, and put them to the sword. The mass
of the people joined us then, when the chances of victory looked so
strong that hope overcame the despair born of generations of oppression.
Now the Green Folk of Giri have thrown off the yoke of the invader at
last, and thousands of them are marching this way to take the army of
the Scaly Ones in the rear."

"But how did you come to arrive in the garden at this particular
moment?" Gerry asked.

"The forces of Giri have forded the river and are marching overland, but
I came ahead with a hundred picked cavalry mounted on swift
saddle-dolphins. We saw a crude type of underwater craft moving in this
direction, and followed it at a distance. You know the rest. After
bringing down the sentries that Lansa had posted below, we left our
dolphins and our water helmets down at the main drain and crept up
through the passages to this place."

"When do you think the rest of the Green Folk will come?" Closana asked.

"Within a few more hours, Princess. They will not be in time to save
your city, but they will be in time to prote