"Yes, he did," the little girl answered. "I know, too. It's hot water
in the boiler that makes it go. The hot water swells up, and turns
into steam, and the steam pushes on the wheels, and that makes the
engine go."

"And our Daddy knows what makes an automobile go, too," went on Hal.
"He knows everything."

"Huh! Well, I guess mine does then, too!" spoke Sammie. I'm going to
ask him what--what--makes it lightning!"

"And then will you tell us?" asked Mab, for she and Hal wanted to know
about everything they saw.

"Yes, I'll tell you," promised Sammie. "And we'll ask Daddy Blake what
makes us warm inside when we run," went on Hal, "and then we'll tell
you that, Sammie."

The children ran home from school, and, thought it was cold, for it
was almost winter now, they did not mind it. Their noses got more and
more red, it is true, but they knew when they were in the house, near
the warm fire, the red would all fade out.

Hal and Mab said good-bye to Sammie, as he turned down his street,
and then the little Blake boy and girl, hand in hand, ran on to their
house.

As they reached it they saw their mamma and their Aunt Lolly out in
the front yard, bringing in pots of flowers and vines.