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."
