In addition to the produce of Arizona, the immediate vicinity of the agricultural region of Sonora affords an abundant market for all necessary supplies, including sugar, which is manufactured by the Mexicans in great quantities from the cane. Guyamas, which one day will be ours, is one of the largest ports for the export of flour on the Pacific coast north of Chili. She also exports several millions in silver annually, which finds its way direct to the English market. Under an intelligent system, the Sonora mines would yield a hundred millions a year, and the supply is inexhaustible. If any reader doubts this statement, refer him to the statistics of Humboldt, Ward, and Wilson, most unquestioned and valuable authorities. Both Humboldt and Ward note the fact that the silver deposites grow richer as they are traced farther North. There can be no doubt that the most extensive and valuable mines, both of pure silver and silver mixed with copper and lead, are within the limits of Arizona. The yield of the silver mines of Mexico, as computed by Ward and Humboldt from the actual official returns to the Government, from the conquest to 1803, amounts to the enormous sum of $2,027,955,000, or more than two BILLIONS Of dollars. Again, Ward says: "I am aware that many of the statements in this and the preceding books respecting the mineral riches of the North of New Spain, (Sonora, including the 'Gadsden Purchase,' Chihuahua, and Durango,) will be thought exaggerated. THEY ARE NOT SO; they will be confirmed by every future report, and in after years, the public, FAMILIARIZED WITH facts which are only questioned because they are new, will wonder at its present incredulity, and regret the loss of advantages which may not always be within its reach."