Mr. Boylan. "Those buttons were imported, and I doubt if I can replace them. They are rather odd."
"Yes," agreed Tom, gazing as if fascinated at the one he still held. "They are rather odd."
And then, as he passed it over, like a flash it came to him where he had seen a button like that before. He had found it in his airship, which had been so mysteriously taken away and returned.
Tom could hardly restrain his impatience until Mr. Boylan had gone. The young inventor had half a notion to produce the other button, matching the one he had just pulled off his visitor's coat, and tell where he had found it. But he held himself back. He wanted to talk first to Ned.
And, when his chum came in, Tom cried:
"Ned, what do you think? I know who had my airship!"
"How?" asked Ned, in wonder.
"By that button clue! Yes, it's the same kind—they're as alike as twins!" and Tom brought out the button which he had put away in his desk. "See, Boylan had one just like this on the back of his coat. The other was missing. Here it is—it was in the seat of my airship, where it was probably pulled off as he moved
