XLI.

LEAD MINES OF IOWA.

BLUFFS AT DUBUQUE, IOWA.—THE LEAD MINES.—HOW LEAD IS FOUND THERE.—INDIAN DISCOVERIES.—HOW THE SECRET BECAME KNOWN.—STORY OF THE SIX INDIANS.—FOLLOWING THEIR TRACKS.—AN INDIAN TRAITOR.—AN EXPLORER’S ADVENTURE.—THE INDIAN GUIDE AND THE GREAT SPIRIT.—MURDER OF TWO EXPLORERS.—USES OF ABANDONED SHAFTS AND CAVES.—AN EDITOR’S DISCOVERY.—AN UNDERGROUND BANQUET.—UPS AND DOWNS OF A LEAD MINER.—DEATH OR A FORTUNE.—A DANGEROUS BLOW.—A MINUTE OF GREAT PERIL. 613