pursued. But they turned the tables by capturing the real burglars,
and defeating the mean plans of the Fogers.

Not satisfied with having mastered the air Tom and his father turned
their attention to the water. Mr. Swift perfected a new type of
craft, and in the fourth book of the series, called "Tom Swift and
His Submarine," you may read how he went after a sunken treasure.
The party had many adventures, and were in no little danger from
their enemies before they reached the wreck with its store of gold.

The fifth book of the series, named "Tom Swift and His Electrical
Runabout," told how Tom built the speediest car on the road, and won
a prize with it, and also saved a bank from ruin.

Tom had to struggle against odds, not only in his inventive work,
but because of the meanness of jealous enemies, including Andy
Foger, who seemed to bear our hero a grudge of long standing. Even
though Tom had, more than once, thrashed Andy well, the bully was
always seeking a chance to play some mean trick on the young
inventor. Sometimes he succeeded, but more often the tables were
effectually turned.

It was now some time since Tom had won the prize in his electric car
and, in the meanwhile he had built himself a smaller airship, or,
rather, monoplane, named the BUTTERFLY. In it he made several
successful trips about the country, and gave exhibitions at numerous
aviation meets; once winning a valuable prize for an altitude
flight. In one trip he had met with a slight accident, and the
monoplane had only just been repaired after this when he received
the message summoning him to Philadelphia.