"Let them, but if they find anything it belongs to them. Jim Dunkan hasn't got any claim on anything in these hills unless he finds it for himself. We'll be getting back now."

It was a jolly evening spent around the campfire of the prospectors. Stories were told, Chops was induced to sing a song, the boys related interesting stories of their experiences on their various journeys, then all hands turned in well satisfied with their day and their evening.

The Pony Rider Boys slept soundly. But late in the night there came an interruption—a rush of the prospectors' collie dog. The animal, tied to a tree, began to bark and strain at its leash. Just before the men turned out to see what the trouble was, the collie broke its leash and dashed away into the bushes, barking furiously. They heard the animal snarling. A yelp followed, then a chorus of explosive barks. The dog's barking ceased suddenly.

"I reckon he's chasing some animal," said Dunkan.

"It didn't sound like that to me," replied Tad, still listening intently. "Of course you know the dog better than do I. Does he bark at every sound?"

"Pretty near," grinned Sam.

"Yes, he usually wakes us up once a night, sometimes more," added Tom Royal. "Reckon we might as well go back to bed."

Jim whistled for the dog. He kept whistling for several minutes, then turned back toward their tent disgustedly.

"He's got on the trail of something and gone beyond sound," he muttered. "He'll be back here in the morning."

"I hope so," muttered Tad.