A century ago Father Felipe Arroyo de la Cuesta collected a mass of 2884 words, phrases, and sentences of the Mutsun Indians, spoken at his mission of San Juan Bautista near Monterey, California. He also composed a grammar of the Mutsun language, a branch of the Costanoan linguistic group.

The present paper consists of two parts, first an exposition of the etymological and morphological elements upon which the structure of the language is based, and second of a list of the various stems of all classes found in the material (Re-edition; originally published 1916 in Berkeley; written in English)