"Sure!" exclaimed Nort. "But have you found out what it's all about?"

"We're going to," said Bud's father, grimly. "The two professors, as they call themselves, didn't take any part in the fight. They're over near that hole in the ground, with some of my steers yoked up to that derrick. I'm going to find out what it means. Keep those fellows well tied, boys!" he commanded his cowboys who had charge of Del Pinzo and his followers.

"Don't worry," drawled Babe, as he rolled a cigarette. "We've hog-tied 'em!"

Indeed, it did seem impossible for Del Pinzo or any of the Greasers to get loose, but their bonds were looked to again, while some of the cowboys busied themselves with the wounded. Then Mr. Merkel, followed by his foreman and the boy ranchers, approached the little knoll on which stood the two professors and the uneasy cattle. The animals had been prevented from stampeding during the fight because of the ropes that bound them to the derrick.

Riding up to the scientists, who seemed dazed by what had taken place,
Mr. Merkel sternly demanded:

"What does this mean?"

He pointed to the harnessed cattle—his own Diamond X steers, which were now more quiet.

"I might ask you the same," retorted Professor Wright, and there was considerable excitement in his voice and manner. "By what authority do you ride into our camp, attacking our men, and interfering with our work which we have permission from the United States government to carry out?"

"I don't know anything about that," said Mr. Merkel, "but I do know that you have some of my cattle, and even the permission of the government doesn't cover the rustling of animals from the Diamond X ranch."

"Cattle rustling?" murmured Professor Blair.