Andres Perez de Ribas, Historia de los triumphos de nuestra santa fee (Madrid, 1645)

The Jesuit provincial's folio on the missions of Sinaloa and Sonora, printed at Madrid in 1645, is the fullest seventeenth-century description of the peoples of the Mexican northwest. It admires languages it calls barbarous for keeping invariable rules, then says plainly that speaking them quiets, represses, wins and subjects. It prints an epidemic of smallpox and measles as providence, a peace sealed with Yaqui children held as hostages, and a defence of the silver mines.