alone the invisible wall surely would have stumped me."

Reaching the entrance they began to mount the stone
stairs. They went up ten stairs and then down five
stairs, following a passage cut from the rock. The
stairs were just wide enough for the two girls to walk
abreast, arm in arm. At the bottom of the five stairs
the passage turned to the right, and they ascended ten
more stairs, only to find at the top of the flight five
stairs leading straight down again. Again the passage
turned abruptly, this time to the left, and ten more
stairs led upward.

The passage was now quite dark, for they were in the
heart of the mountain and all daylight had been shut
out by the turns of the passage. However, Ozma drew her
silver wand from her bosom and the great jewel at its
end gave out a lustrous, green-tinted light which
lighted the place well enough for them to see their way
plainly.

Ten steps up, five steps down, and a turn, this way
or that. That was the program, and Dorothy figured that
they were only gaining five stairs upward each trip
that they made.

"Those Flatheads must be funny people," she said to
Ozma. "They don't seem to do anything in a bold
straightforward manner. In making this passage they
forced everyone to walk three times as far as is