be filled with gold. Tom went there, and in the book, entitled, "Tom
Swift in the City of Gold," I related his adventures.

How he and his friends were followed by the Fogers, how they eluded
them, made their way to the ruined temple in a small dirigible balloon,
descended to the secret tunnel, managed to turn aside the underground
river, and reach the city of gold with its wonderful gold statues--all
this is told in the volume.

Then, after pulling down, in the centre of the underground city, the big
golden statue, the door of rock descended, and made our friends
prisoners. They almost died, but Andy Foger and his father, in league
with some rascally Mexicans and a tribe of head-hunters, finally made
their way to the tunnel, and most unexpectedly, released Tom and his
friends.

There was a fight, but our hero's party escaped with considerable gold
and safely reached Shopton. Now, after a winter spent in work, fixing
over an old aeroplane, we again meet Tom.

"Would you mind telling me something about where this platinum comes
from, and if you can get any more of it?" asked Tom, after a pause,
following the strange statement made by the Russian.

"I will gladly tell you the story," spoke Mr. Petrofsky, "for I am much
interested in inventions, and I formerly did something in that line
myself, and I have even made a small aeroplane, so you see I know the
need of platinum in a high power magneto."

"But where did you get such pure metal?" asked Tom. "I have never seen