“Go on,” urged Bart. “What happened?”

“Well, they fell into the trap as easily as Chunky here can eat pie. I brought around the machine, got them in and off we went for the swamp. When I got them to the fossil bed, wild horses couldn’t have pulled them away, for I’d unearthed some new specimens. And then the fun began. The two professors went at each other with pet theories for weapons, and pointed out minute indications in geology that I had never dreamed of. I was completely out of it, so I wandered off in the woods and waited for them to finish.

“I guess they would have been at it yet, only they dug up a queer kind of rock that stumped them both to tell what it was, and they yelled for me to hurry with them back to the college so they could look it up in the dictionary—or whatever book they use for such things.

“And there you are, boys. We just got back, and it’s up to you chaps to provide some amusement for me in return for listening to a lot of dry rock-talk all afternoon, besides losing my fun.”

“Oh, we’ll take care of you all right!” laughed Bart. “That sure was one dandy little trick! It worked like a charm. Shake!”

Bart and Jerry clasped hands in a most friendly fashion, to the no small disgust of Frank.

“Great work, Jerry!”

“This will go down in college history!”

“The best ever!”

Thus Jerry’s chums congratulated him.