"James Lockhart, an eminent historian of early Latin America, is the leading interpreter of Nahuatl texts and has trained many students in older Nahuatl. One of his main tools of instruction has been Horacio Carochi's monumental 1645 Arte de la lengua mexicana, the most influential work every published on Nahuatl grammar. The best recent grammars of Nahuatl have been based on that of Carochi, but they have not exhausted what remains an important reference work in its own right. . . . The volume is at once an indispensable pedagogical tool and the first critical edition of the premier monument of Nahuatl grammatical literature."—Linguistics and Language Behavior Abstracts "[Grammar of the Mexican Language and Nahuatl as Written] are important additions to our repertoire of materials on Nahuatl. The Carochi grammar is a work of transcendent importance. The translation and editing by Lockhart are a significant contribution."—The Americas "If other usable texts exist that students and interested scholars can use to undertake study of this challenging language, Carochi's text, in combination with Lockhart's workbook, ranks among the most accessible and useful, especially for those working without the benefit of a linguist to explain intricacies of vowel length, verb tenses, and the complex matters of word formation and order."—Latin American Research Review "Hoarcio Carochi's Arte de la lengua is an important and indispensable work on Nahuatl grammar. This edition of the original 1645 Arte de la lengua includes the Spanish version on one side and the English translation on the facing page In this edition Lockhart provides the translation and essential explicatory comments and notes for this volume. This bilingual, critical edition is an important and fundamental work for the student and expert interested in Nahuatl."—Colonial Latin American History Review