The languages considered are: Zapotek, Mixtek, Chinantek, Mazatek, Cuicatek, Chatino, Chocho.
The thesis of this paper is that all these languages are essentially monosyllabic, that they are undergoing an evolution toward the development of a system of pronominal suffixes, that these suffixes can be traced through a series of dialectical variations all the way from a mere repetition of the pronoun after the verb, through agglutination, to fused “inflection” of verbal endings.