CONTENTS.
PAGEStrange Discoveries respecting the Aurora1The Earth a Magnet14Our Chief Time-piece losing Time30Encke the Astronomer46Venus on the Sun’s Face49Britain’s Coal Cellars72The Secret of the North Pole97Is the Gulf Stream a Myth?114Floods in Switzerland133A Great Tidal Wave138Deep-Sea Dredgings142The Tunnel through Mont Cenis148Tornadoes153Vesuvius167The Earthquake in Peru189The Greatest Sea-Wave ever known194The Usefulness of Earthquakes211The Forcing Power of Rain225A Shower of Snow-Crystals230Long Shots233Influence of Marriage on the Death-Rate238The Topographical Survey of India244A Ship attacked by a Sword-fish256The Safety-lamp259The Dust we have to Breathe265Photographic Ghosts267The Oxford and Cambridge Rowing Styles269Betting on Horse Races: or, the State of the Odds274Squaring the Circle288A New Theory of Achilles’ Shield297