"We've got miles and miles of prairie ahead of us.

Run till you are tired! But remember, you've got to carry me back," he added, grimly.
Soon the ranch house and the corral were mere specks in the distance, and then even these faded from view.

The pony kept to the open country, and not once did he slacken his speed.
"I guess he'll drop into a walk when his wind is gone," thought Dave.
But the pony's breathing apparatus showed no sign of giving out.

Dave allowed his eyes to turn back, and calculated he had gone two or three miles.

"Maybe we had better turn back now," he murmured, and tried to guide the steed in a circle.