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"And you've got to snap-shot a volcano?" remarked Ned to his chum, after a moment of surprised silence. "Any particular one? Is it Vesuvius? If it is we haven't far to go. But how does Mr. Period know that it's going to get into action when we want it to?"
"No, it isn't Vesuvius," replied Tom. "We've got to take another long trip, and we'll have