"I don't believe you can surprise that Danny Rugg very much," said
Mrs. Bobbsey.

The next morning, when Bert took Danny's cap to school with him, and
handed it to the boy who had caused so much trouble, a queer look came
over Danny's face.

"Thanks," he said. "I was wondering where I left that. I guess I must
have dropped it, when I was--playing football over in the fields."

"No, you dropped it on our houseboat, the Bluebird, just before you
and the other fellows untied the ropes that let her go adrift," said
Bert. "And you'd better keep off her after this!"

"Huh! I'm not afraid of your father!" was all Danny growled, as he
stuffed his cap in his pocket, for he had worn another to school.

When Danny's chums learned that it was known who had set the boat
adrift, they were rather frightened. When they realized the damage
they might have done, they kept away from Mr. Bobbsey's lumber yard
for a long time.

One day, about a week after this, the Bobbsey twins hurried home from
school without stopping to play with any of their friends.

"Why are you in such a hurry?" asked Grace Lavine of Nan.

"We expect our cousins to-day," Nan answered. "Then we are going to
get ready to go away in our houseboat."