Gallatin's coloured map of the distribution of the Indian tribes in question is also a pioneer piece of work. In 1840 George Bancroft, in the third volume of his _History of the Colonization of the United States_, discussed the Indian tribes east of the Mississippi, listing the following eight families: Algonquin, Catawba, Cherokee, Huron-Iroquois, Mobilian (Choctaw and Muskhogee), Natchez, Sioux or Dahcota, Uchee. He gives also a linguistic map, modified somewhat from that of Gallatin. The next work of great importance in American comparative philology is Horatio Hale's monograph forming the sixth volume (Phila., 1846), _Ethnography and Philology_, of the publications of the "United States Exploring Expedition, during the years 1838, 1839, 1840, 1842, under the Command of Charles Wilkes, U.S. Navy," which added much to our knowledge of the languages of the Indians of the Pacific coast regions. Two years later Gallatin published in the second volume of the _Transactions of the American Ethnological Society_ (New York) a monograph entitled "Hale's Indians of North-west America, and Vocabularies of North America," in which he recognized the following additional groups: Arrapahoes, Jakon, Kalapuya, Kitunaha, Lutuami, Palainih, Sahaptin, Saste, Waiilatpu. In 1853 he contributed a brief paper to the third volume of Schoolcraft's _Information Respecting the History, Condition and Prospects of the Indian Tribes of the United States_, adding to the "families" already recognized by him the following: Cumanches, Gros Ventres, Kaskaias, Kiaways, Natchitoches, Towiacks, Ugaljachmutzi. Some modifications in the original list were also made. During the period 1853-1877 many contributions to the classification of the Indian languages of North America, those of the west and the north-west in particular, were made by Gibbs, Latham, Turner, Buschmann, Hayden, Dall, Powers, Powell and Gatschet. The next important step, and the most scientific, was taken by Major J. W. Powell, who contributed to the _Seventh Annual Report of the Bureau of Ethnology, 1885-1886_ (Washington, 1891) his classic monograph (pp. 1-142) on "Indian Linguistic Families of America North of Mexico." In 1891 also appeared Dr D. G. Brinton's _The American Race: A Linguistic Classification and Ethnographic Description of the Native Tribes of North and South America_ (New York, p. 392). With these two works the adoption of language as the means of distinction and classification of the American aborigines north of Mexico for scientific purposes became fixed. Powell, using the vocabulary as the test of relationship or difference, enumerated, in the area considered, 58 separate linguistic stocks, or families of speech, each "as distinct from one another in their vocabularies and apparently in their origin as from the Aryan or the Scythian families" (p. 26).