ake was already half way up the
side of the dome. Through the glass could be seen swimming fishes, and
tall stalks of swaying seaweeds, for the water was clear as crystal and
through it they could distinguish even the farther shore of the lake.

"The Flatheads are not here yet," said Lady Aurex. "They will come
soon, but not until all of this dome is under the surface of the water."

"Won't the dome leak?" Dorothy inquired anxiously.

"No, indeed."

"Was the island ever sub-sub-sunk before?"

"Oh, yes; on several occasions. But Coo-ee-oh doesn't care to do that
often, for it requires a lot of hard work to operate the machinery. The
dome was built so that the island could disappear. I think," she
continued, "that our Queen fears the Flatheads will attack the island
and try to break the glass of the dome."

"Well, if we're under water, they can't fight us, and we can't fight
them," asserted Dorothy.

"They could kill the fishes, however," said Ozma gravely.

"We have ways to fight, also, even though our island is under water,"
claimed Lady Aurex. "I cannot tell you all our secrets, but this island
is full of surprises. Also our Queen's magic is astonishing."

"Did she steal it all from the three Adepts in Sorcery that are now
fishes?"

"She stole the knowledge and the magic tools, but she has used them as
the three Adepts never would have done."

By this time the top of the dome was quite under water and suddenly the
island stopped sinking and became stationary.

"See!" cried Lady Aurex, pointing to the shore. "The Flatheads have
come."

On the bank, which was now far above their heads, a crowd of dark
figures could be seen.

"Now let us see what Coo-ee-oh will do to oppose them," continued Lady
Aurex, in a voice that betrayed her excitement.

* * * * *

The Flatheads, pushing their way through the line of palm trees, had
reached the shore of the lake just as the top of the island's dome
disappeared beneath the surface. The water now flowed from shore to
shore, but through the clear water the dome was still visible and the
houses of the Skeezers could be dimly seen through the panes of glass.

"Good!" exclaimed the Su-dic, who had armed all his followers and had
brought with him two copper vessels, which he carefully set down upon
the ground beside him. "If Coo-ee-oh wants to hide instead of fighting
our job will be easy, for in one of these copper vessels I have enough
poison to k