The Arte de la lengua mexicana con la declaración de los adverbios della is a grammar of the Nahuatl language in Spanish by Jesuit grammarian Horacio Carochi.

Carochi had an acute understanding of the Nahuatl language and was the first grammarian to understand and propose a consistent transcription of several phenomena in Nahuatl phonology, especially vowel length and the saltillo (glottal stop).

[citation needed] The 1754 Nahuatl grammar Arte de la lengua mexicana is considered particularly derivative of Carochi's work.

[1][2] In 2001 it was published as "Grammar of the Mexican language: with an explanation of its adverbs" in an edition where the Spanish paleographic version appears side-by-side with an English translation by James Lockhart.

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