ing a combined balloon and aeroplane, had to carry much machinery.
It was like the flight of two big birds in the air. Now the smugglers' craft would be mounting upward, with the Falcon after her. Again she would shoot toward the earth, and Tom would follow, with a great downward swoop.
Ned kept the great lantern going, and, though occasionally the craft they were after slipped out of the focus of the beams, the young bank clerk would pick her up again.
To the right and left dodged the forward airship, vainly endeavoring to shake off Tom Swift, but he would not give up. He followed move for move, swoop for swoop.
"She's turning around!" suddenly cried Mr. Damon. "She's given up the flight, Tom, and is going back!"
"That's so!" agreed Mr. Whitford. "They're headed for Canada, Tom. We've got to catch 'em before they get over the Dominion line!"
"I'll do it!" cried Tom, between his clenched teeth.
He swung his airship around in a big circle, and took after the fleeing craft. The wind was against the smugglers now, and they could not make such good speed, while to Tom the wind
