w that the huge dome of the
city of the Ralas was gone.

Beneath them was only a titanic whirlpool of foaming waters in which
only the curved top of the settling dome was visible for a moment as
it sank slowly and ponderously downward, with a roar as of the roar of
falling worlds. Buckling, collapsing, sinking, it vanished in the
foam-wild sea with all the frog-men who for ages had ruled the second
satellite, and with all those prisoners who had at the last dragged
them down with them to death! Ripping off their helmets, with all the
green men shouting crazily about them, Norman and Fellows and Hackett
stared down at the colossal maelstrom in the waters that was the tomb
of the masters of a world.

Then the depression's sides collapsed, the waters rushing together ...
and beneath them was but troubled, tossing sea....

* * * * *

Earth's great gray ball was overhead again and the sun was sinking
again to the horizon when the three soared upward in the long,
gleaming plane, its motor roaring. Norman, with Hackett and Fellows
crowding the narrow cabin beside him, waved with them through its
windows. For all around them were rising the flying-boats of the green
men.

They were waving wildly, shouting their farewells, Sarja's tall figure
erect at the prow of one. Insistent they had been that the three
should stay, the three through whom the monstrous age-old tyranny of
the frog-men had been lifted, but Earth-sickness was on them, and they
had flown to where the plane lay still unharmed among the reeds, a
hundred willing hands dragging it forth for the take-off.

The plane soared higher, motor thundering, and they saw the
flying-boats sinking back from around them. They caught the wave of
Sarja's hand still from the highest, and then that, too, was gone.

Upward they flew toward the great gray sphere, their eyes on the dark
outlines of its continents and on one continent. Higher--higher--green
land and gray tea receding beneath them; Hackett and Fellows intent
and eager as Norman kept the plane rising. The satellite lay, a
greenish globe, under them. And as they went higher still a rushing
sound came louder to their ears.

"The edge of the satellite's atmosphere?" Fellows asked, as Norman
nodded.

"We're almost to it--here we go!"

As he shot the plane higher, great forces smote it, gray Earth and
green satellite and yellow sun gyrating round it as it reeled and
plunged. Then sudd