"I had an idea that one looked like a Japanese and the other a
German," the boy answered promptly.

At this, the army man rubbed his chin and seemed to consider.

"I've taken you into my confidence so far already, boys," he observed presently, "that I suppose I might as well go right along and tell you everything. We are up here, representing the Flying Squadron of the army, to experiment with a new war aeroplane much more powerful than anything before devised; also to ascertain whether there is any truth in the wild claims put forth by the inventor of the latest explosive, that his discovery must make war so horrible that nations would be compelled to keep the peace after this. And, judging from what that one small bomb did here, I fancy he was not mistaken in his estimate. We could destroy the largest battleship afloat as easy as to snap our fingers. Of course there are secret agents of numerous Great Powers constantly floating around in Washington, trying to learn what Uncle Sam has up his sleeve in the way of new inventions calculated to destroy the enemy in time of war. And we have feared all along that one or more of these spies may have gotten on our track. I'm very much gratified with what you have told me, for now we know what to expect, and can avoid taking any unnecessary risk."

"Would these foreign spies dare attempt to ruin your war aeroplane, or try to blow you all up with some of your own explosive?" asked Ralph.

"I wouldn't put it past them," replied the other. "They are playing a desperate game, you understand, and have their orders from the home Governments to keep us from forging ahead too fast. But I haven't introduced myself as yet. I am Lieutenant Fosdick, and I have had some little experience in army aviation."

"I wonder if you can be the same Lieutenant Fosdick I've heard so much about from our Scout Master, a retired army officer named Lieutenant Denmead?" Hugh ventured to say eagerly.

"Well, this is a pleasure to be sure!" remarked the other smilingly. "To be sure I know Denmead. I saw a great deal of him several years ago. And so he is spending his spare time in teaching the young idea how to shoot, but with the arms of peace rather than those of bloody war? He was always crazy over boys, and must be a cracking good Scout Master, because he knows so much of Western life among the Indians. He was with Miles in the Sioux War long ago, as you may know. But what was this you said about one of your mates inventing something in connection with the management of aeroplanes? That would seem to be right in my line, and if he has no serious objections, I'd like to hear about it."

At that, Bud turned fiery red, but with pleasure more than embarrassment. It was a crowning triumph in his career to find himself an object of interest in the eyes of so famous an aviator as Lieutenant Fosdick, of whom he remembered reading quite frequently as the most fearless air pilot in the Flying Squadron of Uncle Sam.

Encouraged by the winning smile on the bronzed face of the army officer, Bud only too gladly started to explain what his hopes were.

"I'd like to see this wonderful little model of yours in action, son," the experienced air pilot remarked afterwards. "Suppose all of you come over to our headquarters, which happen to be not more than half a mile away from here. We have a fine open spot where we can ascend and alight with ease, day or night. You will be welcome, I assure you. We have a dozen men there besides those connected with the war aviation corps, simply to guard against any spies giving us trouble. If you can go now, I'd be pleased to wait for you, so as to pass you through the lines."