“Yes. But I haven’t got my new gasoline mixture perfected yet,” was the answer. “When I do there won’t be any fires or explosions. Why did you think I might be working on the triple traveler, Dad?” he asked his father.

By this time the fire in the young inventor’s private building was practically out and most of the smoke had blown away. Tom and his father and friends entered, and Tom pointed to the table where he had been working. Some shattered retorts and glass tubes testified as to the explosion’s power. Tom had been slightly cut by flying glass, but that was the extent of his injuries.

“Well, I had the triple traveler in mind, Tom,” said Mr. Swift, “because, just before you tried to blow yourself up, my friends and I were talking about round-the-world travel. And I guess I sort of made a foolish boast, Tom.”

“What was that, Dad?”

“Why, I said, Tom, that you could circle the globe in twenty days actual time—nothing taken out for stops or anything like that. In twenty days flat, Tom.”

“Well, I guess maybe it can be done when I get my new machine perfected,” the young inventor said, calmly enough.

“It’s got to be done, Tom, unless you want me to lose twenty thousand dollars!” said his father.

“Twenty thousand dollars! What do you mean?”

“He wagered us ten thousand dollars apiece,” said Mr. Burch, indicating his friend, “that you, Tom Swift, could circle the globe in twenty days. We say it can’t be done!”

For a moment Tom Swift did not answer. His eyes roved to the wall of his office where a world map hung. Quickly Tom’s eyes glanced along the fortieth parallel of latitude, the most logical course to follow on a race of this sort.