sound.

"I hope it isn't going to rain," said Mrs. Morris, as she held a plate
of ice cream in one hand.

"What makes you think it is?" Mrs. Bobbsey asked.

"Didn't you hear that thunder? I can't see the sky, on account of the
trees, but I'm afraid it's clouding over."

"No, the sun is shining," said the twins' mother.

"But I'm sure that is thunder," went on Mrs. Morris.

There was a rumbling sound down the road, and there seemed to be some
excitement there, for a number of children who had started toward the
ice cream pavilion turned back.

"I wonder what it is," mused Mrs. Bobbsey. "I hope no 'almost' accidents
are going to happen."

"I'll go see what it is," offered Bert.

He ran down the road, was gone a little while, and came back, his eyes
shining with eagerness.

"Oh, it's a big merry-go-round!" he cried.

"A merry-go-round?" repeated his mother, busy at the ice cream.