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Rh, in which they went after sunken treasure.

In the book, "Tom Swift and His Electric Runabout," I told how, in the speediest car on the road, Tom saved his father's bank from ruin, and in the book dealing with Tom's wireless message I related how he saved the castaways of Earthquake Island.

When Tom went among the diamond makers, at the request of Mr. Barco Jenks, and discovered the secret of phantom mountain the lad fancied that might be the end of his adventures, but there were more to follow. Going to the caves of ice, his airship was wrecked, but he and his friends managed to get back home, and then it was that the young inventor perfected his sky racer, in which he made the quickest flight on record.

Most startling were his adventures in elephant land whither he went with his electric rifle, and he was the means of saving a missionary, Mr. Illingway and his wife, from the red pygmies.

Tom had not been home from Africa long before he got a letter from this missionary, telling about an underground city in Mexico that was said to 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