"Specimens of this paper still exist, preserving their original freshness, and holding yet unimpaired the brilliancy of color in hieroglyphical painting. It is averred that the Aztecs were as well acquainted with the uses of their mineral as of their vegetable kingdom, deftly working their mines of silver, lead, and tin. It has, however, been contended by Wilson, in his 'New Conquest of Mexico,' that, in spite of Cortez's statement to the contrary, 'it is not to be supposed that the Spaniards found the Aztecs in the possession of silver, since its mining requires a combination of science and mechanical power unknown and impossible to their crude civilization.' He considerately allows them the capability of gathering gold from their rich soil. "Prescott, on the contrary, tells us that 'they opened veins for the procurement of silver in the solid rock, and that the traces of their labors in these galleries furnished the best indications for the early Spanish miners.' "Who shall decide when doctors disagree? Not, indeed, a Koshare, whose laudable purpose it is to eschew the wearisome 'gradgrinds' of history, and accept the infinitely more charming conclusions of the romancer. "Gold, say the chroniclers, was easily gleaned from the beds of their rivers, and cast into bars, or in the form of dust, made part of the regular tribute of the southern provinces of Montezuma's empire. They cast, also, delicately and curiously wrought vessels of gold. Though their soil was impregnated with iron, its use was unknown to this people. As a substitute for this metal, they used, for their tools, a bronze made from an alloy of tin and copper, or of itzli,--a dark transparent metal, found in abundance in their hills. With the former they could cut the hardest substances, such as emeralds and amethysts. "It has been contended that an ignorance of the use of iron must necessarily have kept the Mexican in a low state of civilization. On the other hand, it is urged that iron, if even known, was but little in use among the ancient Egyptians, whose mighty monuments were hewn with tools of bronze, while their weapons and domestic utensils were of the same material. For the ordinary purposes of domestic life, the ancient Mexicans made earthenware, and fashioned cups, bowls, and vases of lacquered wood, impervious to wet, and gorgeously colored. "Among their dyes, obtained from both mineral and vegetable substances, was the rich crimson of the cochineal, the modern rival of the far-famed Tyrian purple. Later, this coloring material was introduced into Europe, from Mexico, where the curious cochineal insect was nourished with great care on plantations of cactus.