a race. Next Tom built an airship, and in this he went on a
wonderful trip. Returning from this he and his father heard about
a treasure sunken under the ocean. In his submarine boat Tom
secured the valuables, and made a large sum for himself.

In his electric runabout, which was the swiftest car on the
road, Tom was able to save from ruin a bank in which his father
was interested, and, a short time after that, he went on a trip
in an airship, with a man who had invented a new kind. The
airship was smashed, and fell to Earthquake Island, where there
were some refugees from a shipwreck, among them being the parents
of Mary Nestor. In the volume called "Tom Swift and His Wireless
Message," I told how he saved these people.

When Tom went among the diamond makers he had more strange
adventures, on that trip discovering the secret of phantom
mountain. He had bad luck when he went to the caves of ice, for
there his airship was wrecked.

When Tom made the trip in his sky racer he broke all records
for an aerial flight, incidentally saving his father's life. It
was some time after this when he invented an electric rifle, and
went to elephant land, to rescue some missionaries from the red
pygmies.

The eleventh volume of the series is called "Tom Swift in the
Land of Gold," and relates his adventures underground, while the
next one tells of a new machine he invented--an air-glider--
which he used to save the exiles of Siberia, incidentally, on
that trip, finding a valuable deposit of platinum.