The Gadsden purchase is attached by act of Congress to the Territory of New Mexico. At the time of its acquisition there was scarcely any population except a few scattering Mexicans in the Mesilla valley, and at the old town of Tucson, in the centre of the territory. The Apache Indian, superior in strength to the Mexican, had gradually extirpated every trace of civilization, and roamed uninterrupted and unmolested, sole possessor of what was once a thriving and populous Spanish province. Except the report of Col. A. B. Gray, there is scarcely anything in print with reference to the early history of Arizona, beyond the scanty but valuable notes of Major Emory and Hon. John R. Bartlett, in their reports, and in the appendix to Wilson's late book, "Mexico and its Religion." To this last I beg to refer any reader who desires accurate information respecting the Northern Mexican provinces, presented in a straightforward common-sense style. In the possession of the writer of these notes is a map drawn in 1757, just one hundred years ago, presented by the Society of Jesuits to the King of Spain. The original of this map is now in the archives of the Mexican Government. It was copied, with the notes relating to the Territory, and to Sonora, Chihuahua, and Sinaloa, by Capt. C. P. Stone, late of the United States Army. The map bears the inscription, "Carte levee par la Societe des Jesuites, dediee au Roi d'Espagne en 1757." The copy of the map and the accompanying notes are certified as accurate by the officer of the Mexican Government in charge of the archives. My information, therefore, upon the early history of this comparatively unknown domain, is accurate and reliable. As early as 1687, a Jesuit missionary from the province of Sonora, which, in its southern portion, bore already the impress of Spanish civilization, descended the valley of Santa Cruz river to the Gila. Passing down the Gila to its mouth, after exploring the country, he retraced his steps, penetrated the country north of the Gila river for some distance, and ascended the Salinas or Salt river, and other northern branches of the Gila. The explorations of this energetic priest did not stop here. Proceeding east, he explored the valley of the San Pedro and its branches, thence along the Gila to the Mimbres, and probably to the Rio Grande and the Mesilla valley. Filled with the enthusiasm of his sect, he procured authority from the head of the order in Mexico, and established missions and settlements at every available point. In a report to the government of the viceroy of Spain, made during the early settlement of the province, I find the following language: "A scientific exploration of Sonora, with reference to mineralogy, along with the introduction of families, will lead to a discovery of gold and silver so marvellous that the result will be such as has never yet been seen in the world."