what aviator you've got up here," continued the gentleman, as he cast a quick glance out over the lake. "You see, our attention was attracted toward that circling biplane as we came along. I happen to know some of the most famous fliers myself; but I never heard that any one of them was hiding up here this summer, trying fancy stunts. Look at that dip, Longley. That was a corker, now, I'm telling you. Do you know who that fellow is, my boy; the one handling the levers of that sparkling biplane out yonder?"

Larry and Elephant glanced at each other and grinned. Then the little fellow threw out his chest, after a pompous way he had, and observed:

"Sure we do, mister. That's a chum of ours. His name is Frank Bird, and he knows more about aeroplanes in a minute than the rest of us do in a year. His cousin, Andy, is along with him. They stick together through thick and thin."

"Bird!" remarked the other, watching the agile movements of the biplane eagerly, as Larry could not but note. "A very suggestive name for a flier, too."

"That's right," burst out Larry. "Frank always said he was just forced to take to being an aeronaut. He says it's just as natural for birds to take to the air, as it is for ducks to swim in the water."

"Bird?" the other went on, turning to his companion. "Seems to me, Longley, there used to be a professor by that name in one of our colleges, who went daft on the subject of flying."

"You're right, Marsh; and he lost his life down at Panama; tried to cross the isthmus in a dirigible, and was never heard from again."

"Oh! but you're wrong, sir!" exclaimed Elephant, eagerly. "He was saved through those two boys in their monoplane, and is alive and well in Bloomsbury right now. It's a great story, and all to the good for the Bird boys."

"I'd like to hear it some time or other," replied the gentleman called Mr. Marsh by his companion who was serving as chauffeur. "But it seems to me these young fellows must be unusually bright boys to do what they're doing right now."

"That's easy for Frank and Andy Bird, sir," declared Larry. "Why, they've got a shop that they keep under lock and key, where they spend most of their time when they ain't flying. That biplane is what they made last winter—got some of the parts, and did the rest themselves. And it would be just like Frank to have invented some clever stunt that's going to just revolutionize flying."

Again a quick look passed between the two tourists, but the boys simply considered that it implied wonder at such youthful ingenuity.

"They must be smart boys, surely," remarked Mr. Marsh, again turning his head to look out over the lake. "And you say they even have a shop, where they work out these wonderful new ideas? Perhaps if we stayed over in Bloomsbury, Longley, they might be willing to let us have a little peep in that place?"

Elephant promptly shook his head in the negative.

"I wouldn't build too much on that, if I was you, sir," he said, "because, you see, we're chums of the Bird boys; and if they wouldn't let us once inside that shop all winter they ain't going to invite strangers there."

"Well, hardly," laughed the other. "How's that, Longley? Quite interesting to run across a couple of boy inventors up this way. Must tell Wright about it the next time we see him, and Curtiss too. They'll want to look them up perhaps, and coax them to join the new aeroplane trust that's forming. But what makes that biplane shine so? It glitters in the sunlight like silver."

"That's just what me and Elephant were talking about when you came along, mister," remarked Larry.

"And we just came to the conclusion that it must be something Frank's been experimenting on. Mebbe he's made his machine out of aluminum; or else he's got a new Kinkaid engine that has a lot of brass about it. Gee! look at 'em now, Larry! My heart jumped up in my throat because they just skimmed the water, and I was dead sure it meant a ducking for the boys."

"They certainly seem to know how to handle an aeroplane as well as any one I have ever seen," declared Mr. Marsh; who apparently could not tear his eyes away from the thrilling spectacle of the swooping air craft, that soared aloft, only to again dart daringly down toward the surface of the almost quiet lake.

"I bet you it's a game of conquer they're playing," suggested Elephant. "Each one seeing how close to touching the water he can come. Say, Larry, d'ye suppose Percy Carberry has got his new biplane yet? He's been boasting about it for weeks, and what he meant to do when she arrived."

"I saw him this morning, and he said he was still waiting; but that the thing had been shipped," replied the other. "Never saw such an unlucky dog as Percy is; and to tell the honest truth, Elephant, 'twouldn't surprise me one little bit if the old train got smashed up on the way, and the new flying machine along with it."

"Wonder if he's watching the stunts them fellers are doing out there, and saying all sorts of mean things about 'em?" suggested the smaller boy, grinning.

"Shouldn't wonder," Larry chirped. "He keeps tab on all Frank does these days. You know they've had to keep a man on duty every night around that workshop, because of Percy. He ain't to be trusted, and would just as soon put a match to the place as eat his dinner—if he thought he could do it on the sly."

Mr. Marsh caught the eye of his companion, and instantly a quick signal seemed to pass between them, unnoticed by either of the two boys, who were keeping their attention glued on the fluttering aeroplane a quarter of a mile away, and which had again mounted to quite a little height by means of boring upward in circles.

"There they go again!" exclaimed Elephant, excitedly, as the flying machine once more tilted its planes, and started down toward the water like a huge bird intending to alight.

"Oh! look at it, would you?" cried Larry, almost as much worked up as his smaller companion. "This time there's going to be something doing! I bet you Frank wants to just snatch a floating piece of wood off the water as he skims along, just like them Wild West riders do on horseback, when they throw their hats down. Why! Something must a-busted—they dropped splash on the lake; and look at the old biplane sitting right there like a great big gull! Ain't that too bad, though; I'm sorry for Frank and Andy!"

But Mr. Marsh, bending his head close to the ear of the man who sat in the front of the touring car, laughed softly, and remarked with an air of triumph:

"What did I tell you, Longley? Now say it was a false scent, will you? It isn't often I make a mistake, and already I believe we've struck great luck in coming up here."

CHAPTER II

A RESCUER FROM THE SKIES

"What if the bally thing takes a notion to duck under, Larry?" asked Elephant, staggered himself at the possibility of such a catastrophe happening.

"Wow! they'd stand a chance of being drowned, then, I take it!" answered the taller lad, shaking his head as if worried.

"Say, p'raps we ought to be chasing after a boat, and putting out there right now," the small boy exclaimed.

"O K say I. Let's make a dash for Cragan's dock, and borrow his skiff!" suggested Larry, ready to toss fishing poles, and even the fine catch in the dusty weeds bordering the road, so that they might be unimpeded in their flight.

"Hold on, boys!" observed the gentleman in the tonneau of the touring car, as he reached out and caught Larry by the