"Do we know him?" repeated Billy. "I should say we do."
Frank soon appeased old Mr. Joyce's curiosity and told him of their experiences in Africa with Luther Barr pitted against them.
"If Luther Barr intends making money out of duplicates of the Buzzard, that explains a whole lot of things," cried Harry, as Frank concluded.
"That's right," cried Frank. "I shouldn't wonder if he's at the bottom of this whole business. I only wish we had the evidence against him."
"Don't I too?" rejoined Harry; "but he covers up his tracks too cleverly."
CHAPTER IX.
THE GRASSHOPPER'S MISHAP.
The grounds by noon were fairly alive with crowds of curious men, women and children, and every train brought more. They swarmed about the aerodromes and almost drove the mechanics and aviators crazy with the ridiculous questions they asked.
"Oh, mister, what's that flapper for?" inquired a woman with a green dress and a red parasol of old Schmidt, the owner of the eccentric Green Grasshopper, indicating that machine's propeller.
"That's to keep the flies off, madam," gravely rejoined Billy Barnes, who happened to be standing by, assisting Schmidt to adjust his planes.