"Some day, when it gets warmer, I'll take my Lamb over to Dorothy's
house and let her see the Sawdust Doll," said Mirabell to her brother.

"And I'll take my fire engine over and I'll ride on Dick's Rocking
Horse," said Arnold. "But it is so cold now the water in my engine might
freeze if I took it over to Dick's house."

"Yes, it is cold," agreed Mirabell. "I guess I'll take my Lamb down to
the sitting room, where there's a fire on the hearth."

"I'll come too," said Arnold. "I'll bring my little fire engine."

Soon the two children were having a good time with their toys in front
of the fireplace in the sitting room. On the hearth blazed a snapping,
crackling warm fire of logs.

"Now you can get nice and warm," said Mirabell to her Lamb, as she set
her down close to the fireplace. "You stay here and get warm, and I'll
go and ask Susan for some cookies to eat."

Arnold also went to the kitchen with his sister, and when the two
children came back to the sitting room they saw a dreadful sight. A
spark had popped out from the hearth and set fire to a piece of paper on
the floor near the Lamb on Wheels.

"Oh, she'll burn! My Lamb on Wheels will burn!" cried Mirabell, as she
rushed forward.