"Sure I can, if my horse doesn't bolt," and Andy got to his feet. He had fallen in a thick bunch of grass that acted as a mat, and, beyond a shaking up, was not hurt.

"Oh, Max won't run," said Billy, and he proved it by walking up and catching the steed. Soon the trio of lads were riding on again.

"Well, you didn't get the rabbit after all," remarked Frank, with a smile at his brother.

"No, and it was his fault that I stumbled," complained the younger Racer. "I'm going to watch for prairie dogs' holes after this."

"You won't often see 'em, unless you get on a barren place," spoke Billy. "But let's see if we can hit up the pace any. We don't want to be out after dark."

He spoke to Buffalo, who increased his speed, the other horses doing the same thing. In a little while the rancher's nephew said:

"There it is!"

"What?" asked Andy.

"The dam. See those two low hills over there?" and Billy pointed to them. "It's between those hills, and the river is right there."

"Oh, yes," answered Frank. "And what's that break in the middle of the concrete work?"