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 were converted into the rarest of all elements&mdash;radium&mdash;so that the equivalent of a billion dollars in gold could be placed in a receptacle no bigger than a cigar box.

When Fitz-Norman had been dead three years his son, Braddock, decided that the business had gone far enough. The amount of wealth that he and his father had taken out of the mountain was beyond all exact computation. He kept a note-book in cipher in which he set down the approximate quantity of radium in each of the thousand banks he patronised, and recorded the alias under which it was held. Then he did a very simple thing&mdash;he sealed up the mine.

He sealed up the mine. What had been taken out of it would support all the Washingtons yet to be born in unparalleled luxury for generations. His one care must be the protection of his secret, lest in the possible panic attendant on its discovery he should be reduced with all the property-holders in the world to utter poverty.

This was the family among whom John T. Unger was staying. This was the story he heard in his silver-walled living-room the morning after his arrival.

After breakfast, John found his way out the great marble entrance, and looked curiously at the scene before him. The whole valley, from the diamond mountain to the steep granite cliff five miles away, still gave off a breath of golden haze which hovered idly above the fine sweep of lawns and lakes and gardens. Here and there clusters of elms made delicate groves of shade, contrasting strangely with the tough masses of pine forest that held the hills in a grip of dark-blue green. Even as John looked he saw three fawns in single file patter out from one clump about a half-mile away and