 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).His art was seen as important soon after its elaboration and already in 1759 a version called ""compendio del arte ..."" re-edited by Fray Ignacio Paredes was prepared and reprinted.This version which has been reprinted many times since, however, lacks most of the virtues of the original work.