The principal members of this stock are the Utes, Shoshonees and Comanches in the north, various tribes in Sonora, Chihuahua, Sinaloa and Durango in the center, and the Nahuas or Aztecs in the south. It is not to be understood that the one of these derived its idioms from the other, but rather that at some remote epoch all three were offshoots from some one ancestral stem. This was at a period before the grammatical forms of the tongue had reached full development, and probably when it was in a stage of isolation, with tendencies to suffix agglutination and incorporation. Since then the stages of growth which the several dialects have reached have been various. The one which far outstripped all others was the Nahuatl, which arrived at clear and harmonious sounds, fixed forms, and even some recognizable traces of inflection, though always retaining its incorporative character. The establishment of the unity of this linguistic family we owe to the admirable labors of Joh. Carl Ed. Buschmann, who devoted years of patient investigation to examining the traces of the Nahuatl, or as he preferred to call it, the Aztec language, in Mexico and throughout the continent to the north. In spite of deficient materials, his sharp-sighted acumen discovered the relationship of the chief tongues of the group, and later investigations have amply confirmed his conclusions.[133] Long before his day, however, the Spanish missionaries to the tribes of Sonora and Sinaloa had recognized their kinship to the Aztecs, and Father Ribas, in his history of the missions established by the Jesuits in Mexico, published in 1645, stated that the root-words and much of the grammar of all these dialects was substantially the same as those of the Nahuatl.[134] It is without doubt the most numerous stock now surviving. According to the census figures of the governments of the United States and Mexico for 1880, the numbers were as follows:[135] Shoshonian group, including Pimas in U. S. 26,200 Sonoran group in Mexican Territory 84,000 Aztecan group 1,626,000 _a. The Ute or Shoshonian Branch._ The northern, or Ute branch, which I so call from its most prominent member, includes the Shoshonees, Utes and Comanches, with their numerous sub-tribes and affiliated bands. They occupied at the beginning of this century an immense area, now included in south-eastern Oregon, Wyoming, Montana, Idaho, Nevada, parts of California, New Mexico and Arizona, northern and western Texas, and the states of Durango and Chihuahua in Mexico. Other names by which they are known in this area are Snakes, Bannocks, Moquis, etc. Everywhere their tongue is unmistakably the same. “Any one speaking the Shoshonee language may travel without difficulty among the wild tribes from Durango, in Mexico, to the banks of the Columbia River.”[136] Their war parties scoured the country from the Black Hills of Dakota far into the interior of Mexico.