Gidap, Boomerang. See if yo' can break some mo' speed records now."
But the mule appeared to be satisfied with what he had done, and, as he rode off, Tom looked back to see the colored man laboring to get the sleepy animal started.
The lad did not tell his father of the adventure with Morse, but he related the occurrence to Mr. Sharp.
"I'd like to get hold of that scoundrel, and the others in the gang!" exclaimed the balloonist. "I'd take him up in the airship, and drop him down into the lake. He's a bad man. So are the others. Wonder what they want around here?"
"That's what's puzzling me," admitted Tom. "I hope dad doesn't hear about them or he will be sure to worry; and maybe it will interfere with his new ideas."
"He hasn't told you yet what he's engaged in inventing; has he?"
"No, and I don't like to ask him. He said the other day, though, that it would rival our airship, but in a different way."
"I wonder what he meant?"
"It's hard to say. But I don't believe he can invent anything that will go ahead of our craft, even if he is my own father, and the best one
