experience, he was able to go in search of the diamond makers, and
solve the secret of Phantom Mountain, as told in the book dealing
with that subject.

When he went to the caves of ice Tom had bad luck, for his airship
was wrecked, and he endured many hardships in getting home with his
companions, particularly as Andy Foger sought revenge on him.

But Tom pluckily overcame all obstacles and, later, he built a sky
racer, in which he made the quickest trip on record. After that,
with his electric rifle, he went after elephants in the interior of
Africa and was successful in rescuing some missionaries from the
terrible red pygmies.

One of the mission workers, later, sent Tom details about a buried
city of gold in Mexico, and Tom and his chum together with Mr. Damon
located this mysterious place after much trouble, as told in the
book entitled, "Tom Swift in the City of Gold." The gold did not
prove as valuable as they expected, as it was of low grade, but they
got considerable money for it, and were then ready for more
adventures.

The adventures soon came, as those of you who have read the book
called, "Tom Swift and His Air Glider," can testify. In that I told
how Tom went to Siberia, and after rescuing some Russian political
exiles, found a valuable deposit of platinum, which to-day is a more
valuable metal than gold. Tom needed some platinum for his
electrical machines, and it proved very useful.

He had been back from Russia all winter and, now that Spring had