“Well, you certainly look like business here,” exclaimed Billy as he gazed about him. What with the lathes, the work-tables, the blue prints and plans, the shaded drop-lights and the small gasolene motor,—used to test propellers and run the machinery of the shop,—Frank and Harry were indeed as Billy said, “running a young factory.”

“You picked out a private spot,” exclaimed Billy, gazing out of the tall aerodrome doors at the low, wooded hills that surrounded them.

“Well,” laughed Frank, “if we hadn’t we’d have half the population of White Plains around here trying to get on to what we were doing and spreading all sorts of reports.”

“Oh, by the way,” asked Billy, “did you have any more manifestations from our dark-skinned friend on your way to New York?”

“No,” replied Frank, “he sat in his chair and read the papers and apparently paid no more attention to us. I really begin to think that we may have been mistaken.”

“I guess so,” said Billy lightly; “maybe he was just some rubber-neck who was surprised to hear three boys talking so glibly about invading the Everglades in an airship.”

With that the subject was dropped, for Harry, who had just entered the workshop from the small barn outside, where he had been putting the horse up, carried Billy off to show him the “camp” as the boys laughingly called it. The eating and sleeping quarters were in a small portable house, a short distance from the main aerodrome. It was divided into a dining and a sleeping room. The latter neatly furnished with three cots—a third having been added to Frank and Harry’s for Billy’s use that very morning. On its wall hung a few pictures of noted aviators, a shelf of technical books on aviation and the usual odds and ends that every boy likes to have about him. The two mechanics took their meals in the house and slept in the aerodrome. The cooking was done by Le Blanc who, like most of his countrymen, was a first-rate chef.

“Camp!” exclaimed the admiring Billy after he had been shown over the little domain, “I call it a mansion. Different from old Camp Plateau in Nicaragua, eh?”

“And you came very nearly been shaken out of even that;” put in Harry with a laugh.

“I should say so,” rejoined the reporter. “B-r-r-r-r! it makes my teeth chatter now when I think of the rain of stones that came from the Toltec ravine. By the way,” he broke off suddenly, “where is good old Ben Stubbs?”