Crosby, who, some distance ahead of them, was giving an exhibition of her
powers as a maker of figure eights and cross-cuts.

"That's the junior captain," answered Grace. "I hope she won't fall,
because she's heavy enough to go right through the ice if she should have
a hard tumble."

"Suppose we stop watching her," suggested Tom. "I don't want to see her
take a header, and people who show off on skates always do so, sooner or
later."

They changed their course toward the middle of the pond, while Julia, who
was turning and circling nearer the shore, watched them from one corner of
her eye.

Suddenly Grace stopped.

"Julia! Julia!" she cried. "Miss Crosby!"

"What's the matter?" demanded Tom.

"Don't you see the danger flag over there? She will skate into a hole if
she keeps on. The ice houses are near here, and I suppose it is where they
have been cutting ice."

"Hello-o!" cried Tom, straining his lungs to reach the skater, who looked
back, gave her usual tantalizing laugh and skated on.

"You are getting onto thin ice," screamed Grace in despair, beckoning
wildly. "Stop! Stop!"