The following represents some of the results of four journeys into the interior of Peru and also many explorations into the labyrinth of early writings which treat of the Incas and their Land. Although my travels covered only a part of southern Peru, they took me into every variety of climate and forced me to camp at almost every altitude at which men have constructed houses or erected tents in the Western Hemisphere-from sea level up to 21,703 feet. It has been my lot to cross bleak Andean passes, where there are heavy snowfalls and low temperatures, as well as to wend my way through gigantic canyons into the dense jungles of the Amazon Basin, as hot and humid a region as exists anywhere in the world. The Incas lived in a land of violent contrasts. No deserts in the world have less vegetation than those of Sihuas and Majes; no luxuriant tropical valleys have more plant life than the jungles of Conservidayoc. In Inca Land one may pass from glaciers to tree ferns within a few hours. So also in the labyrinth of contemporary chronicles of the last of the Incas-no historians go more rapidly from fact to fancy, from accurate observation to grotesque imagination; no writers omit important details and give conflicting statements with greater frequency. The story of the Incas is still in a maze of doubt and contradiction.