Though many of Mr. Swift's inventions paid him well, he was
constantly seeking to perfect others. To this end he had built near
his home several machine shops, with engines, lathes and apparatus
for various kinds of work. Tom, too, had the inventive fever in his
veins, and had planned some useful implements and small machines.

Along the pleasant country roads on a fine day in April rode Tom
Swift on his way to Mansburg to register the letter. As he descended
a little hill he saw, some distance away, but coming toward him, a
great cloud of dust.

"Somebody must be driving a herd of cattle along the road," thought
Tom. "I hope they don't get in my way, or, rather, I hope I don't
get in theirs. Guess I'd better keep to one side, yet there isn't
any too much room."

The dust-cloud came nearer. It was so dense that whoever or whatever
was making it could not he distinguished.

"Must be a lot of cattle in that bunch," mused the young inventor,
"but I shouldn't think they'd trot them so on a warm day like this.
Maybe they're stampeded. If they are I've got to look out." This
idea caused him some alarm.

He tried to peer through the dust-cloud, but could not. Nearer and
nearer it came. Tom kept on, taking care to get as far to the side
of the road as he could. Then from the midst of the enveloping mass
came the sound of a steady "chug-chug."

"It's a motor-cycle!" exclaimed Tom. "He must have his muffler wide