rack. To one of normal Oroid size it would have been
unnoticeable--a space hardly so great as the thickness of a thin sheet
of paper. But the Very Young Man could see it plainly; he gauged its
size by slipping the edge of his robe into it.

This crack was formed by the bottom of the door and the level surface of
the floor; there was no sill. The door was perfectly hung, for the crack
seemed to be of uniform size. The Very Young Man showed it to Aura.

"There's the way out," he whispered. "Through there and then large again
on the other side."

He made his calculation of size carefully, and then, crushing one of the
pills into powder, divided a portion of it between himself and the girl.
Aura seemed tired and the drug made her very dizzy. They both sat upon
the stone floor, close up to the door, and closed their eyes. When, by
the feeling of the floor beneath them, they knew the action of the drug
was over, they stood up unsteadily and looked around them.

They now found themselves standing upon a great stone plain. The ground
beneath their feet was rough, but as far away as they could see, out up
to the horizon, it was mathematically level. This great expanse was
empty except in one place; over to the right there appeared a huge,
irregular, blurred mass that might have been, by its look, a range of
mountains. But the mass moved as they stared at it, and the Very Young
Man knew it was the nearest one of Targo's men, sitting beside the
table.

In the opposite direction, perhaps a hundred yards away from where they
were standing, they could see the bottom of the door. It hung in the air
some fifty feet above the surface of the ground. They walked over and
stood underneath; like a great roof it spread over them--a flat, level
surface parallel with the floor beneath.

At this extraordinary change in their surroundings Aura seemed
frightened, but seeing the matter-of-fact way in which her companion
acted, she maintained her composure and soon was much interested in this
new aspect of things. The Very Young Man took a last careful look around
and then, holding Aura by the hand, started to cross under the door in a
direction he judged to be at right angles to its length.

They walked swiftly, trying to keep their sense of direction, but having
no means of knowing whether they were doing so or not. For perhaps ten
minutes they walked; then they emerged on the other side of the door and
again faced a great level, empty exp