Swiftly they drew near to the flaming colored suns, and passed close beside them. The light was then so bright that it dazzled their eyes, and they covered their faces with their hands to escape being blinded. There was no heat in the colored suns, however, and after they had passed below them the top of the buggy shut out many of the piercing rays so that the boy and girl could open their eyes again.

“We’ve got to come to the bottom some time,” remarked Zeb, with a deep sigh. “We can’t keep falling forever, you know.”

“Of course not,” said Dorothy. “We are somewhere in the middle of the earth, and the chances are we’ll reach the other side of it before long. But it’s a big hollow, isn’t it?”

“Awful big!” answered the boy.

“We’re coming to something now,” announced the horse.