both labor and space. The excavation of the apartments within had been
similarly governed by necessity.

As he came nearer Tarzan saw that the waste material from these
building operations had been utilized in the construction of outer
walls about each building or group of buildings resulting from a single
hillock, and later he was to learn that it had also been used for the
filling of inequalities between the hills and the forming of paved
streets throughout the city, the result, possibly, more of the adoption
of an easy method of disposing of the quantities of broken limestone
than by any real necessity for pavements.

There were people moving about within the city and upon the narrow
ledges and terraces that broke the lines of the buildings and which
seemed to be a peculiarity of Ho-don architecture, a concession, no
doubt, to some inherent instinct that might be traced back to their
early cliff-dwelling progenitors.

Tarzan was not surprised that at a short distance he aroused no
suspicion or curiosity in the minds of those who saw him, since, until
closer scrutiny was possible, there was little to distinguish him from
a native either in his general conformation or his color. He had, of
course, formulated a plan of action and, having decided, he did not
hesitate in the carrying out his plan.

With the same assurance that you might venture upon the main street of
a neighboring city Tarzan strode into the Ho-don city of A-lur. The
first person to detect his spuriousness was a little child playing in
the arched gateway of one of the walled buildings. "No tail! no tail!"
it shouted, throwing a stone at him, and then it suddenly grew dumb and
its eyes wide as it sensed that this creature was something other than
a mere Ho-don warrior who had lost his tail. With a gasp the child
turned and fled screaming into the courtyard of its home.

Tarzan continued on his way, fully realizing that the moment was
imminent when the fate of his plan would be decided. Nor had he long to
wait since at the next turning of the winding street he came face to
face with a Ho-don warrior. He saw the sudden surprise in the latter's
eyes, followed instantly by one of suspicion, but before the fellow
could speak Tarzan addressed him.

"I am a stranger from another land," he said; "I would speak with
Ko-tan, your king."

The fellow stepped back, laying his hand upon his knife. "There are no
strangers that come to the gates of A-lur," he sa