Sahara

297   III. North America—   The Discovery of the New World 306 New York 317 Chicago and the Great Lakes 326 Through the Great West 333   IV. South America— The Inca Empire 341 The Amazons River 351   V. In the South Seas— Albatrosses and Whales 358 Robinson Crusoe's Island 362 Across the Pacific Ocean 365 Across Australia 372   VI. The North Polar Regions— Sir John Franklin and the North-West Passage 377 The Voyage of the "Vega" 386 Nansen 392   VII. The South Polar Regions 404

LIST OF ILLUSTRATIONS