BOOK SECOND. DISCOVERY OF AMERICA BEFORE.COLUMBUS. Positions on the map of Ic?land, Greenland, and Masscchusetts, lands in the West, of Vinland, of truth, Concluding testimony, THE AZTEC CITY OF SUMAI. INTRODUCTION. The late remarkable expedition of Colonel Doniphan through the Mexican couniry has been narrated with considerable detail in the New Orleans Naiional newspaper, and from it, been extensively copied and circulated by the press of the United Stales. Though most of the facts are highly exciting and interesting, yet there is one among them that will survive the remembrance of the others, and be more likely to perpetuate the meinory of that iirduous lidertaking than even the object, for which it was diespaiched. We ullide to the discovery of that long sought and anxiously waited for event, an Aztec city and genuine Mexican inliabitants. The National gives the following story aimong its sketches, under the heading of EXTRAORDINARY INLAND CITY. About ihe time Colonel Doniphan made his trea ty with the Navajos, a division, of his command was entirely out of provisions, but these were libe. rally supplied with the present necessities, by the |