Dorothy stretched out a hand to him and Zeb put one foot out and let it rest in the air a little over the edge of the roof. It seemed firm enough to walk upon, so he took courage and put out the other foot. Dorothy kept hold of his hand and followed him, and soon they were both walking through the air, with the kitten frisking beside them.

“Come on, Jim!” called the boy. “It’s all right.”

Jim had crept to the edge of the roof to look over, and being a sensible horse and quite experienced, he made up his mind that he could go where the others did. So, with a snort and a neigh and a whisk of his short tail he trotted off the roof into the air and at once began floating downward to the street. His great weight made him fall faster than the children walked, and he passed them on the way down; but when he came to the glass pavement he alighted upon it so softly that he was not even jarred.

“Well, well!” said Dorothy, drawing a long breath, “What a strange country this is.”