All about him Wieroos were moving across the roofs or winging
through the air. The sad sound of their flapping wings rose and
fell like a solemn dirge. Most of them were appareled all in
white, like his captors; but others had markings of red or blue
or yellow slashed across the front of their robes.

His guide pointed toward a doorway in an alley below them.
"Go there and eat," he commanded, "and then come back.
You cannot escape. If any question you, say that you belong
to Fosh-bal-soj. There is the way." And this time he pointed
to the top of a ladder which protruded above the eaves of the
roof near-by. Then he turned and reentered the house.

Bradley looked about him. No, he could not escape--that
seemed evident. The city appeared interminable, and beyond the
city, if not a savage wilderness filled with wild beasts, there
was the broad inland sea infested with horrid monsters. No wonder
his captor felt safe in turning him loose in Oo-oh--he wondered if
that was the name of the country or the city and if there were
other cities like this upon the island.

Slowly he descended the ladder to the seemingly deserted alley
which was paved with what appeared to be large, round cobblestones.
He looked again at the smooth, worn pavement, and a rueful grin
crossed his features--the alley was paved with skulls. "The City
of Human Skulls," mused Bradley. "They must have been collectin'
'em since Adam," he thought, and then he crossed and entered the
building through the doorway that had been pointed out to him.