Peru is a land of violent extremes. It has a range of mountains as great as any in the world. The towering peaks are too high to climb. Far above circles the condor, the largest bird in the world. Peru is the source of the world’s greatest river system, whose luxuriant forests are too thick to penetrate. The only representatives of a lost geological age inhabit them, as well as the biggest snakes and the smallest birds. Peru has great mineral deposits in the mountains; it also has rubber in the forests. Wool is produced on the frozen plains, and chocolate in the deep gorges lost among them. And from the valleys intersecting the desert come cotton and sugar-cane. All kinds of obscure substances are found in this versatile country, ipecac and cochineal, cocaine and vanadium. Not unlike the rest of the world, chill here produces fever, but quinine, the best remedy for the disease of contrast, comes also from the forests of Peru. Although nature is a supreme fact, its natural history is not the whole of Peru. And contrast as a method of interpretation does not fail for its other aspects. Though man seems to play so small a part, he has lived here since antediluvian animals wandered among coal forests on the Andes. To the charm of limitless nature is added the mystery of great peoples destroyed before they were known. The riches of the Incas and of the glittering, vice-regal Spanish days, when continents were found, taken, and explored, contrast with present poverty. Consistently throughout, the riches of Peru have impoverished it. Its gifts have caused its ruin over and over again. Wars and rebellions have riddled the country, and bull-fights have filled leisure hours. Though audacity of action has fascinated historians of Peru, its periods of peace have in them even more of romance: a nation of slaves ruled by a monarch-god; oriental splendor of Lima shining because of forced labor in the dark, suffocating mines; Arab blood in the conquerors’ veins penetrating the quiet Indian people, adding a keener edge to their sufferings. The poverty of the present-day Indians contrasts with lavish nature, “beggars sitting on a pile of gold.” Contrasts of nature, of people to country, of antiquity to the present--these diverse elements are insistent wherever one turns. The charm of contrasting facts is puissant. Almost any one of them might be the text for an allegory. To guard against rhapsody, I have documented every statement made. Conservative authority can be given for every fact, however fantastic, however trivial. The few legends are in a sense also facts: “_Une légende ment parfois moins qu’un document._”