MOUNTAIN CHAINS BETWEEN NATIONS.—MONT CENIS.—CROSSING THE ALPS.—THE GREAT ALPINE TUNNEL.—LAYING OUT THE WORK.—THE ARC AND DORA.—DIFFICULTIES.—THE SURVEYS.—PENETRATING THE MOUNTAIN.—COMPLETION OF THE WORK.—THE CHANNEL TUNNEL.—ITS COST.—COST OF TUNNELS IN VARIOUS COUNTRIES. 510 XXXV. THE PARISIAN SEWERS. THE SEWERS OF PARIS.—THEIR EXTENT.—A JOURNEY THROUGH THEM.—THE START AND THE MODE OF TRAVEL.—DESCRIPTION OF THE GREAT SEWER.—ACCIDENTS OF SEWER TRAVEL.—HISTORY OF THE SEWERS.—THEIR FIRST GREAT INSPECTION.—BRUNESEAU.—INUNDATION FROM THE SEWERS.—A MAN LOST.—HORRIBLE DEATH IN THE SEWERS.—THE OLD AND THE NEW.—THE EXCAVATIONS.—NATURE OF THE WORK.—BREAKAGE OF THE CANAL.—JEAN VALJEAN IN THE SEWERS OF PARIS.—HIS FIRST SENSATION.—CAUGHT IN A LABYRINTH.—THE SEWERS OF ST. DENIS, AND THE MARKETS.—CAUGHT IN THE WATER.—THE POLICE IN PURSUIT.—FRIGHT OF THE FUGITIVE.—THE QUICKSAND ON THE COAST OF BRITTANY.—A HORRIBLE DEATH.—QUICKSAND IN THE SEWERS.—HOW IT WAS FORMED.—JEAN VALJEAN IN THE QUICKSAND.—HIS SUFFERINGS AND ESCAPE. 524 XXXVI. MERCURY. PROPERTIES AND PECULIARITIES OF MERCURY, OR QUICKSILVER.—AMALGAMATION.—CINNABAR.—WHERE IT IS FOUND.—ALMADEN AND OTHER MINES.—CURIOUS CUSTOMS AT IDRIA.—MODES OF WORKING.—HUANCA VELICA.—QUICKSILVER MINES IN CALIFORNIA.—CALIFORNIA LAWSUITS.—WONDERFUL PROPERTIES OF SPANISH TITLES.—AN UNHAPPY ACCIDENT.—PRACTICAL VALUE OF AN EARTHQUAKE.—AN UNDERGROUND CHAPEL. 551 XXXVII. GUANO AND THE COOLIE TRADE. GUANO AND ITS CHARACTER.—WHERE IT IS FOUND.—THE CHINCHA ISLANDS AND THEIR WEALTH.—NOVEL PLANS OF THE PERUVIANS.—HOW THEY DIG AND LOAD GUANO.—EFFECT OF GUANO ON A STRANGER.—JARVIS’S AND HOWLAND’S ISLANDS.—THE COOLIES AND THEIR LABOR.—STORIES OF HORRIBLE CRUELTIES.—HOW THE ASIATIC SLAVE TRADE IS CONDUCTED.—MUTINY ON SHIPBOARD.—MURDER OF THE CREW.—HUMAN MINCE MEAT.—TREATMENT OF COOLIES AT WORK.—EXTENT OF THE COOLIE TRAFFIC.—PROBABLE FATE OF MISSING SHIPS. 561 XXXVIII. AVONDALE. THE GREAT CALAMITY IN PENNSYLVANIA.—ITS CAUSE.—DISCOVERY OF THE FIRE.—SCENES AT THE MOUTH OF THE MINE.—BURNING OF THE BREAKER.—DESCRIPTION OF THE FIRE.—EFFORTS FOR RESCUE.—THE DOG AND LAMP.—DESCENT OF THE SHAFT.—WHAT THE EXPLORERS SAW.—DISCOVERY OF THE BODIES.—AFFLICTION OF FATHER AND SON.—BRINGING OUT BODIES.—BURIAL OF THE DEAD. 578 XXXIX. IRON AND IRON MINES. IRON AND ITS VALUE.—ITS ABUNDANCE, AND WHERE IT IS FOUND.—A MOUNTAIN OF IRON.—IRON MOUNTAIN AND PILOT KNOB.—THE AUTHOR’S VISIT.—CHASED BY GUERRILLAS.—A NARROW ESCAPE.—THE ANTIQUITY OF IRON.—ITS VALUE IN MANIPULATION.—IRON AS MONEY.—INCONVENIENCE OF USING IT.—FIRST IRON WORKS IN AMERICA.—DIFFERENCE BETWEEN IRON AND OTHER MINES.—DIRECT AND REVERSE WORKINGS.—A PICTURESQUE SCENE. 590 XL.