cover the secret of making diamonds it will be a valuable one."
"I guess it will, dad; and Mr. Jenks is entitled to know it, for he paid his good money to that end. He has promised to go halves with me, as payment for the use of the airship, and I must say the two diamonds he gave me last night have proved very valuable."
"Two diamonds, Tom? You only showed me one, an uncut gem"; and Mr. Swift looked at his son.
"Oh, the other—er—the other is—I left it with a jeweler," and Tom blushed a trifle, as he thought of the present he contemplated making to Mary Nestor.
That afternoon, as Tom was out in the shed of the Red Cloud looking over the airship, to see what would be necessary to do to it in order to get it in shape for a long trip, he heard voices outside.
"Yes—yes, I know the way in perfectly well," he caught. "You needn't bother to come, my good fellow. Just step this way, and I'll show you something worth seeing."
"I wonder if it's that mysterious man coming back?" thought Tom. He dropped the tool he was using, and hurried to the door. As he approached it he heard the voice continue
