Documents prepared in authentic manuscripts and published in French in 1885, is the most authoritative for the knowledge of ancient Mexican language source. In addition to collecting full Molina vocabulary, including the terms on which the Nahuatl culture has endured: names of gods, heroes, rulers, arts and crafts, corporations, ranging revealing a homogeneous mental and social texture, toponímicos , names of plants, animals, celestial bodies, which testify to the sciences that were grown in Mexico.