“So long,” he called. “See you again maybe before long.”

“If you do,” said Bob, under his breath, “it won’t be lucky for you.”

“Well, what do you think of that?” breathed Herb, as the Radio Boys once more started for the lodge. “Who would ever have thought we’d have the bad luck to see Buck up here?”

“That fellow,” remarked Jimmy, puffing as he tried to keep up with the longer strides of the other boys, “is a bad penny. He’s always turning up just when you least expect him.”

“I wonder,” said Bob reflectively, “if he can be spending his vacation up here too.”

“Looks like it,” admitted Joe, with a scowl. “Tough luck for us, I’ll tell the world.”

“Oh, I don’t know,” said Bob, cheerfully. “I have a notion Buck and Carl, too, will keep pretty well out of our way. They aren’t anxious to mix it up with us any.”

“No. But they’re sure to try to make it unpleasant for us some way or other,” insisted Herb. “You know how they are. They’ll do any sort of mean trick as long as there isn’t too much danger of their getting a black eye out of it.”

“We’ll have to take our chance on that,” said Bob, with a grin, adding: “But, somehow, after being lost in that cave, Buck doesn’t bother me a bit. Let him do his worst. He’ll get a good deal better than he gives!”

Nevertheless, in the days that followed the boys thought a great deal about their meeting with the two cronies, and they made all sorts of inquiries in order to find out where the boys were staying.