This tongue was spoken in the middle of the last century over a region of country principally within Sonora, the northernmost of the seven Provinces then comprising the kingdom of New Galicia under the Viceroyalty of New Spain. The limit of Sonora on the east was continuous along the chain of mountains that divides it from Taraumara,-from Sateche, the farthest of the Indian settlements in that district, southwardly eighty leagues to Bacoa Sati the first of its towns. On the west the Province was washed by the sea of Cortez from the mouth of the Hiaqui to the Tomosatzi, or Colorado, the waters of the Hiaqui forming its limit to the south; and on the north by a course from the Mission of Baseraca westwardly through the Presidio de Fronteras to that of Pitic (Terrenate), a distance of seventy leagues. According to the opinion of a Jesuit Father, the author of an anonymous work in manuscript on that country, written in the year 1762 at Alamo, it was thought also to be the most important among the many Provinces of Mexico, whether for fertility of soil, gold washings, or silver mines; and not less distinguishable for the docility and loyalty of those aboriginal inhabitants who had early given their adhesion to the government to secure religious instruction. The Missions of Sonora included moreover a section to the south bounded by the River Chico within the Province of Ostimuri. To the north, within the religious precinct, was the Pimeria Alta through the Sobahipuris up to the junction of the river of that name, (otherwise the San Pedro,) with the Gila; thence for a distance of more than one hundred and thirty leagues, after passing [pg 6] among rancherias of Pima, Opa, and Cocomaricopa, and having received in its course the Asumpcion, or Compuesto-from its being formed by the united waters of two streams, the Salado and Verde-it enters the Tomosatzi, closing that Pimeria of innumerable tribes described by the missionaries as sealed in productive places, and in a genial climate. Other Indians of the same names, the Yuma also and Papapootam (Papago) lived beyond, as appears from the accounts given by the spiritual invaders of those remote regions, chiefly the Fathers Kino, Keller, and Sedelmayer.