Of course Hiram, in his impetuous way, was ready to take up any proposition in the aviation line, no matter how important. To him Dave was the one champion in the field able to compete with all rivals. He had been with Dave long enough, however, to get used to his methodical business-like ways. Hiram was eager to plunge at once into the merits of the new proposition, but he knew that Dave had put the matter aside until he was ready to take it up for real action.

“Oh, say, Dave,” Hiram changed the subject, “come along till I show you the picture our tramp friend has drawn. That’s the man who tried to blow us up,” he announced, as they reached the side of the hangar where the sheet of manilla paper was tacked.

Dave surveyed the sketch critically. He saw at a glance that the artist had caught some strong facial characteristics of the person whose likeness he had attempted to draw. The young birdman shook his head slowly.

“Don’t know him?” broke in Hiram questioningly—“neither do I. Anybody would again, though, if that sketch looks like him. See here, Dave,” and Hiram was very serious and impressive, “it’s just such mean tricks as this one that have been the start of all kinds of trouble for us. We want to nip it in the bud this time. What do they say up at the office?”

“They promise a thorough investigation. There has been quite a lot of vandal work at the different meets, and they say they will spare no pains, or expense, to run down the fellows who are discrediting our exhibitions. Want to speak to me?” asked Dave in a kindly tone, noticing the tramp hovering about near them as if he had something on his mind.

“Why, yes,” answered Borden. “You fellows have been mighty good to me, and I feel as if I owed you something. I’m no detective, or anything of that sort, but if it’s a point to you to find out something about the original of that picture——”

“I should say it was!” interrupted Hiram, strenuously.

“Then, as I’m the one who saw him closest, and who know him best, maybe I’d be luckiest in recognizing him on sight. I’ll take a little scurry around, if you say so, and try to run him down, or head him off, and find out what’s back all this.”

“Vernon, our old-time enemy is back of it, or else some envious chaps who think you may go to this new meet, and who want to keep you out of it because they know you’ll win,” whispered Hiram to Dave.

“That is a very good idea,” said the latter to Borden. “You think you saw this same man hanging around the grounds last evening? You might come across him again by keeping your eyes open. Suppose you do that now? Here’s a little change you may need,” and the young aviator slipped some silver coins into the man’s hand. “Hiram, the management here are talking about a bonus-flight the end of this week. I’m interested and have promised to meet with the directors in an hour. I suppose you want to take your regular fly with the Scout?”