an island in the sky that would be named Sky Island?"

"Of course not!" declared Cap'n Bill. "There wouldn't be anything to
hold it up, you know."

"What's holding US up?" asked Trot.

"Magic, I guess."

"Then magic might hold an island in the sky. Whee-e-e! What a black
cloud!"

It grew suddenly dark, for they were rushing through a thick cloud
that rolled around them in billows. Trot felt little drops of
moisture striking her face and knew her clothing was getting damp
and soggy. "It's a rain cloud," she said to Button-Bright, "and it
seems like an awful big one, 'cause it takes so long for us to pass
through it."

The umbrella never hesitated a moment. It made a path through the
length of the heavy, black cloud at last and carried its passengers
into a misty, billowy bank of white, which seemed as soft and fleecy
as a lady's veil. When this broke away, they caught sight of a
majestic rainbow spanning the heavens, its gorgeous colors glinting
brightly in the sun, its arch perfect and unbroken from end to end.
But it was only a glimpse they had, for quickly they dove into
another bank of clouds and the rainbow disappeared.

Here the clouds were not black, nor heavy, but they assumed queer
shapes. Some were like huge ships, some like forest trees, and