"I guess I'm beginning to know something," said Jerry, a little proudly, when they left the doctor's office just at dark Friday evening after an interesting lesson.

"I got real well acquainted with that handsome skeleton," remarked Gray, who had been a little sensitive at first about approaching the uncanny bony structure which Dr. Rivers called one of the "ornaments" of his experimenting room.

Although Herb and Tender were urged to remain at the Crawford's for supper, the former thought it best to go on home.

"I can't be very long away from dad," he explained, "or he has a search party out after me."

"I didn't realize how much this Boy Scout affair was going to do for you," observed the captain that night at the supper table, when Jerry and Fred had been relating their new accomplishments. "I was a little skeptical at first—thought it was a waste of time—but I'm getting pretty much interested in it now myself."

"I think it is a splendid idea," agreed Mrs. Windham, who, mother-like, was in favor of anything that safeguarded the interest and welfare of her boy.

"And his aeroplane stunt strikes me as pretty fine," went on Jerry's father. "As a whole, this vacation is doing more for you boys than a year of schooling, and—" he was interrupted by the ringing of the telephone bell.

"Hello—Phipps, yes, this is Crawford," they heard him say. "What's that? Well, that's strange. Oh, I don't think it can be anything serious. The doctor is not at the house? Gone to Silver City? Well, we'll start right out."

"What is it?" cried Mrs. Crawford, as the group at the table arose and surrounded the captain.

"Phipps says Herb's horse came home alone, wounded in the back. He's afraid something has happened to him and Graystock. Thinks it may be that thing that's killing the sheep—or thieving Greasers," explained captain, speaking hurriedly, at the same time putting on his hat and ringing for the maid.