A temporary aerodrome had been constructed on the edge of a large city about twenty-five miles from Lake Linden, where we find the young aviator at the opening of the present story. There Mr. King, Mr. Dale and some skilled workmen were energetically pushing forward their work. If their plans did not go awry, before the end of August the giant airship would start out on the strangest, grandest trip ever attempted in the field of aeronautics.

In the meantime the Interstate Aero Company had prevailed on Dave to give them a month’s special service. This comprised the exhibition of their latest hydro-monoplane, the Gossamer, at Lake Linden. The district was one visited every summer by men of wealth from New York, Boston and other large cities. The Interstate people had secured what had once been a small private park. Here Dave, Hiram and Mr. Grimshaw had been located for over a week.

The object of their exhibitions was to influence a sale of the Interstate machines among the rich men visiting Lake Linden. Many of them were aero enthusiasts. Besides that, the proprietors of the resort paid the company quite a large fee for making occasional flights as an attraction to popularize the lake.

Dave glanced after the man who had just had the verbal tussle with Mr. Grimshaw. He did not like his trivial looks any more than the old balloonist had. They had many curious visitors at the enclosure, however, and Dave forgot the strange brag of the latest one, as he looked down the road in the direction of the town of Linden.

“It’s strange Hiram doesn’t get back with the carryall,” remarked the young aviator.

“Yes, I heard the train come in half an hour ago,” replied Grimshaw. “Expecting quite a crowd, aren’t you, Dashaway?”

“Why, yes, according to the message the Interstate people sent me,” said Dave. “It seems there is a special party of foreign airmen our New York salesman has interested. Some of them have come over to take a try at the meets in the Southern circuit, and want to buy machines.”

“They’ll find ours the best,” asserted Grimshaw.

“I think that, too,” agreed Dave. “That’s why I’ve got everything spick and span inside there. The Gossamer looks as if she was just waiting to float like an eagle at the word.”

“She’s a beauty, and no mistake,” declared Grimshaw, and like some ardent horseman gazing at a fond pet, he pushed open the gate, and fixed his eyes on the hydro-aeroplane in the middle of the enclosure. “She’s the last word in airships,” boasted the old enthusiast. “That trial flight of yours yesterday, Dashaway, was the prettiest piece of air work I ever saw.”