Introduction; Correspondence of Isidore and Braulio; The Etymologies: I: Grammar and its parts; II. Rhetoric and dialectic; III. Mathematics, whose parts are arithmetic, music, geometry, and astronomy; IV. Medicine; V. Laws and the instruments of the judiciary, and chronology; VI. The order of scripture, cycles and canons, liturgical feasts and offices; VII. Gods and angels, prophetic nomenclature, names of the holy fathers, martyrs, clerics, monks, and other names; VIII. Church and synagogue, religion and faith, heresies, philosophers, poets, sibyls, magicians, pagans, gods of the gentiles; IX. Languages of the nations, royal, military, and civic terminology, family relationships; X. Certain terms in alphabetical order; XI. Human beings and their parts, the ages of humans, portents and metamorphoses; XII. Four-footed animals, creeping animals, fish, and flying animals; XIII. Elements, that is, the heavens and the air, waters, the sea, rivers and floods; XIV. Earth, paradise, the regions of the whole globe, islands, mountains, other terms for places, and the lower regions of the earth; XV. Cities, urban and rural buildings, fields, boundaries and measures of fields, roads; XVI. Earthly materials from land and water, every kind of gem and precious stones, ivory likewise, treated along with marble, glass, all the metals, weights and measures; XVII. Agriculture, crops of every kind, vines and trees of every kind, herbs and all vegetables; XVIII. Wars and triumphs and the instruments of war, the forum, spectacles, games of chance and ball games; XIX. Ships, ropes, and nets, iron workers, the construction of walls and all the implements of building, also wool-working, ornaments, and all kinds of clothing; XX. Tables, foodstuffs, drink, and their vessels, vessels for wine, water, and oil, vessels of cooks, bakers, and lamps, beds, chairs, vehicles, rural and garden implements, equestrian equipment.