But it was upon two figures standing by the now open window that Dick concentrated his entire attention. An exclamation escaped him. There was no mistaking the smaller one of the two, whose face, framed in by a square of dark, seemed to be staring hard toward them.
“It’s Willie Sloan!” he cried.
“Willie Sloan!” echoed Dave, in startled tones.
“Sure! I guess the other must be Major Warfield Carroll himself. And both of them seem to be trying to signal us.”
“I spotted Willie in a moment,” explained Cranny. “Gee! I don’t like this a little bit. If the balloon is ever carried over to the mountains——”
The big lad’s sentence ended in a whistle.
“And you can just bet that’s where she’s bound,” declared Tim. “This wind is rising steadily. Hurry up, Bob,” he yelled, “or you’ll be too late!”
His voice carried to the busy worker below, but it was some moments before Bob Somers scrambled hastily upon the roof, with the other eager and excited lads following him closely.
Each received the news with some characteristic expression of astonishment.
“William aboard that air-ship!” cried Tom, almost incredulously.