"Listen!" and Nat cocked his head as though he could hear better in that position.

"What was it? Did you catch a shout for help? Perhaps Elmer's caught up with him, Nat!"

"I thought I heard somebody call out, or laugh," Nat began, when he was interrupted by a shout.

"Toby—Nat, hurry along with your wheels!"

"That's Elmer!" gasped Toby, as he tried to add a little more speed to his forward progress.

"Perhaps he's got him under his knee, and is holding him for us," suggested Nat.

"That's silly," returned the other, immediately. "It won't hold water, Nat. Whatever would he tell us to bring our machines, if he had the hobo? Tell you what, I reckon he's made off along the road with Elmer's motorcycle, that's a fact!"

"And he wants one of ours to chase him with! Oh, I wish I could fly right now, so's to hurry!" Nat cried.

"A fine mess you'd make of it, if even a fellow like me, that's up to snuff, don't seem able to get it down pat," sneered Toby.

"I see Elmer, and he's waving his hand to us like fun!" exclaimed Nat, without appearing to take any notice of the slur cast upon his abilities in the line of aviation.