air craft has not figured in any of my previous stories, but as it is so nearly like the one that was crushed in the caves of ice, I will not give a description of it here. Those who care to may refer to the book telling of Tom's trip to the caves of ice for a detailed account of the craft.
Sufficient to say that this latest airship, named the Falcon, was the largest Tom had ever built. It contained much room many comforts, and could sail for several thousand miles without descending, except in case of accident. It was a combined dirigible balloon and aeroplane, and could be used as either, the necessary gas being made on board. It was large enough to enable the air glider to be taken on it in sections.
It was about a week after their first meeting with him, that Ivan Petrofsky paid a visit to the Swift home. He was warmly welcomed by the aged inventor and Mr. Damon, and, closeted in the library of the house, he proceeded to go more into details of his own and his brother's exile to Siberia, and to tell about the supposed location of the lost platinum mine.
"I don't believe we can start for several weeks yet," said Tom, after some discussion. "It will take me that long to make the glider."
"And I, too, need a little time," said the Russian. "I will write to some friends in St. Peters-
