“Burthon has joined the Aëro Club, has donated a handsome cup for the best endurance flight during the coming meet at Dominguez, and in some way has made himself so popular with the officials that he has been appointed a member of the committee on arrangements. I dropped in at the Club yesterday, for I’m a member, and made this discovery. My scheming brother-in-law has some dusky, deep laid plan, and is carrying it out with particular attention to detail.”

“Do you think it concerns us, sir?” asked Orissa, anxiously.

“Yes. It isn’t extraordinary that Burthon should take a fancy to aviation. He is full of fads and fancies, and such a thing is liable to interest him. It interests me. But the meat in the nut is the fact that he is building a copy of the Kane Aircraft, merely adding a few details which he will declare are improvements.”

“Can’t we issue an injunction and stop him?” asked Steve.

“I’ve seen a lawyer about that. We can’t prove infringement at this stage of the game and it would be folly to attempt it. Burthon’s plan is to exhibit his machine first, then keep yours off the field during the meet and afterward claim that you are infringing upon his rights. He has organized a stock company, keeping most of the stock himself, has entered his device in all the aviation tournaments throughout the country, and is issuing a circular offering the machines for sale. I have a hand proof, fresh from the printer, of this circular.”

“Who will be his aviator?” asked Steve, with puckered brows.

“His former chauffeur, Mr. Totham Tyler, is one. He is now looking for another, also.”

Steve drew a long breath.

“What can we do?” he asked in a bewildered tone.

“Checkmate him,” was the composed reply.