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 mals also have a market value. There is greater certainty in breeding, and there is established a better medium of exchange with the towns. The frequent intertribal wars of the border region of the Puna have given way to a state of settled life and security. The trails are safe, and the needs of the towns absorb the output of the plateau Indian. Yet in spite of these things the old forms of life persist. The old types of architecture, the search for mountain pastures, the coming and going of flocks and traders—these things continue almost unchanged from the conditions of two hundred years ago.