"I hope not," replied Dave, "but Mr. Price said we might come to a pinch where we could use them to show we were not unprotected, and to scare any crowd that tried to interfere with us."

"Well, it begins to look like real business," commented Hiram.

"That's what we're here for."

"Yes, indeed."

They had no difficulty in getting the Monarch II aloft, the hollow extending for several hundred feet. The night was ideal for a secret sky voyage. A slight mist hung over the ground, but at a height of five hundred feet the air was perfectly clear. There was bright starlight, and against the radiance they could make out flying birds quite a distance away.

Dave took a route across the lake diagonally from Anseton. They skirted the other shore for about ten miles. Then they recrossed the lake. The machine made a sweep along the coast line.

"Well, Dave," remarked his trusty assistant, "we've run across no air bird so far."

"I didn't expect to, all at once," was Dave's reply. "We can only keep at it."

"And trust to luck—I say!"

Hiram interrupted himself with a shout. Just beneath them an excursion steamer was ploughing its way through the waves, bound citywards on its return trip. They could hear the music of the band aboard, until now drowned out by hoarse blare of the fog whistle.