line being clearly
outlined against a large body of water. Here and there the surface was
obscured by great white patches of clouds that cast their shadows
below.

"Atlantis!" breathed Phaestra reverently.

The lost continent of mythology! The fabled body of land that was
engulfed by the Atlantic thousands of years ago--a fact!

Tommy glanced at Frank, noting that he had withdrawn his gaze from the
sphere and was devouring Phaestra with his eyes. As if drawn by the
ardor of his observation, she raised her own eyes from the sphere to
meet those of the handsome visitor. Obviously confused, she dropped
her long lashes and turned nervously to the controls. Tommy
experienced a sudden feeling of dread. Surely his pal was not falling
in love with this Theronian empress!

Then there came another change in the note of the sphere and once more
they lost themselves in contemplation of the scene within. The surface
of the lost continent was rushing madly to meet them. With terrific
velocity they seemed to be falling. An involuntary gasp was forced
from Tommy's lips. Mountains, valleys, rivers could now be discerned.

* * * * *

Then the scene shifted slightly and they were stationary, directly
above a large seacoast city. A city of great beauty it was, and its
buildings were of the same octagonal shape as were those of Theros!
There could be but one inference--the Theronians were direct
descendants of those inhabitants of ancient Atlantis.

"Yes," sighed Phaestra, in answer to the thought she had read, "our
ancestors were those you now see in the streets of this city of
Atlantis. A marvelous race they were, too. When the rest of the world
was still savage and unenlightened, they knew more of the arts and
sciences than is known on the surface to-day. The mysteries of the
Fourth Dimension they had already solved. Their telescopes were of
such power that they knew of the existence of intelligent beings on
Mars and Venus. They had conquered the air. They knew of the relation
between gravity and magnetism but recently propounded by your
Einstein. They were prosperous, happy. Then--but watch!"

Faint sounds of the life of the city came to their ears. A swarm of
monoplanes roared past just beneath them. The streets were crowded
with rapidly moving vehicles, the roof-tops with air-craft. Then
suddenly the scene darkened; a deep rumbling came from the sea. As
they watched in fascinated wonder, a gre