With Dave once more on his back, the pony tried new tactics. Around and around he went in a circle, sending the dust of the corral flying in all directions. Then, like lightning, he reversed, nearly breaking his own neck, and causing Dave to slip far down on the outer side. But the youth hung to the saddle, and, leaning forward, slapped the bronco a smart crack on the neck. This he followed up with a blow on the head. The effect was just what the boy desired. The pony forgot all his tricks, and leaping high into the air, he shot off like a streak toward the corral gate. Once outside, he headed for the open plains, going with the speed of a racer on the track. "They're off!" cried Roger. "Don't let him throw you!" yelled Todd. "Can't we ride after 'em?" queried Phil. "Sure we can ride after 'em," responded Todd. "An' we better do it, too, fer there ain't no tellin' what that pony will do to Dave," he added, anxiously, and with a black look at Yates, which made the other cowboy cast his eyes to the ground. On and on sped the bronco, with Dave sitting firmly in the saddle. So long as the pony kept going, the lad felt he had nothing to fear. But he was on the alert, for he did not know but that the animal would play another trick at any instant. "Go on, old boy!" he muttered. "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. But this was a failure. The pony kept straight ahead, running due eastward, as the youth could see by the sun. "All right, go as far as you please," said Dave, grimly. "If you can stand it, so can I," and he settled in the saddle. Another two miles were covered, and then the bronco commenced to slacken his speed. Dave was on guard at this, and it was well to be, for, a second later, the pony once more tried the trick of flinging his rider over his head. But the effort was a failure, and in return Dave dug his knees deeply into the steed's ribs. Then off went the pony on a run again. This time the bronco did not cover over a mile before dropping into a walk. Then Dave tried again to turn the animal, but without success. "Don't want to go back, eh?" said the youth. "Well, you've got to, and that is all there is to it!" And he hit the pony a sharp slap on the neck and dug his knees into the animal's ribs as before.