The sciences and arts which are now the boast of European civilization, were then but awakening from a slumber of ages; in the latter, the workmanship of Europe was in many instances inferior to that of the new world, and in the former, to take as an instance that which occupies the highest place, astronomy, the civil year of the Mexicans was intercalated and restored to the solar, by a process more perfect than that we even now employ; and the latter was not introduced into Europe until half a century after the throne of Montezuma fell. The bloody human sacrifices which excited to such a degree the abhorrence of the conquerors, were not greater marks of savage cruelty, than were their own _auto da fes_, and the tortures inflicted on Guatemozin. Yet if not superior in bravery, in the arts, the sciences, and the more distinctive attribute of civilization, humanity, the possession of iron was sufficient to ensure the triumph of the Spaniards. Of all the metallurgic arts, that by which iron is prepared from its ores, demands the greatest degree of practical skill, and is the most difficult to bring to perfection. Although ages have elapsed since it first became an object of human industry, its manipulation and preparation are yet receiving improvements, while those of the other ancient metals appear hardly susceptible of modification or advancement. Copper and its alloys, tin, lead, and mercury, were as well and as cheaply prepared by the ancients as by the moderns; and the reduction of the precious metals has received no important change, since the process of amalgamation was first applied to them,--while the preparation of iron is daily improving under our eyes, and its cost diminishing. It may even be doubted whether the iron we first find mentioned in history, was an artificial product, and not obtained from the rare masses in which it is found existing in the native state, and which are supposed to be of meteoric origin. The original use of iron is ascribed in the sacred writings to Tubal Cain, who lived before the flood;--but we have no proof that he did not employ a native iron of this description. Be this as it may, the united testimony of antiquity exhibits to us an alloy of copper used for the purposes to which we apply iron, and the latter metal as comparatively scarce, and of high value. The qualities of iron were known and appreciated, but the art of preparing it was not understood. The reason is obvious; those ores of iron which have an external metallic aspect, are difficult of fusion and reduction, those which are more readily converted, are dull, earthy in their appearance, and unlikely to attract attention,--while gold and silver manifest in their native state their brilliant characters, and the ores of copper and lead exhibit a higher degree of lustre than the metals themselves.