Clavigero says that vessels of copper or other inferior metal were gilded, by employing an unknown process in which certain herbs were used, and which would have made the fortune of a goldsmith in Spain and Italy. Oviedo also tells us that various ornamental articles were covered with thin gold plate.[591] To enumerate the articles manufactured by the Nahua gold and silver smiths, and included in the long lists of presents made by Montezuma and other chieftains to their conquerors is impracticable; they included finely modeled goblets, pitchers, and other vessels for the tables of the kings and nobility; frames for stone mirrors and rich settings for various precious stones; personal ornaments for the wealthy, and especially for warriors, including rings, bracelets, eardrops, beads, helmets and various other portions of armor; small figures in human form worn as charms or venerated as idols; and finally the most gorgeous and complicated decorations for the larger idols, and their temples and altars.[592]
Little is known of the methods or implements by which the workers in gold accomplished such marvelous results. The authors tell us that they excelled particularly in working the precious metals by means of fire; and the furnaces already mentioned are pictured in several of the Aztec picture-writings as simple vessels, perhaps of earthen ware, various in form, heaped with lumps of metal, and possibly with wood and coal, from which the tongues of flame protrude, as the workman sits by his furnace with his bamboo blow-pipe. How they cast or molded the molten gold into numerous graceful and ornamental forms is absolutely unknown. The process by which these patient workers carved or engraved ornamental figures on gold and silver vessels by means of their implements of stone and hardened copper, although not explained, may in a general way be easily imagined. They worked also to some extent with the hammer, but as gold-beaters they were regarded as inferior workmen, using only stone implements. The art of working in the precious metals was derived traditionally from the Toltecs, and the gold and silversmiths formed in Mexico a kind of corporation under the divine guidance of the god Xipe.[593]
WORKING IN STONE.
Stone was the material of most Nahua implements. For this purpose all the harder kinds found in the country were worked, flint, porphyry, basalt, but especially obsidian, the native iztli. Of this hard material, extensively quarried some distance north of Mexico, nearly all the sharp-edged tools were made. These tools, such as knives, razors, lancets, spear and arrow heads, were simply flakes from an obsidian block. The knives were double-edged and the best of them slightly curved at the point. The maker held a round block of iztli between his bare feet, pressed with his chest and hands on a long wooden instrument, one end of which was applied near the edge of the block, and thus split off knife after knife with great rapidity, which required only to be fitted to a wooden handle to be ready for use. The edge thus produced was at first as sharp as one of steel, but became blunted by slight use, when the instrument must be thrown away. Thus Las Casas tells us that ten or fifteen obsidian razors were required to shave one man's beard. Stone knives seem rarely if ever to have been sharpened by grinding.[594] Of obsidian were made the knives used in the sacrifice of human victims, and the lancets used in bleeding for medicinal purposes and in drawing blood in the service of the gods. For bleeding, similar knives are said to be still used in Mexico.[595] The use of stone in the manufacture of weapons has been mentioned in another chapter. Masks and even rings and cups were sometimes worked from obsidian and other kinds of stone. Axes were of flint, jade, or basalt, and were bound with cords to a handle of hard wood, the end of which was split to receive it.[596] Torquemada says that agricultural implements were made of stone.[597] Mirrors were of obsidian, or of margajita,—spoken of by some as a metal, by others as a stone,—often double-faced, and richly set in gold.[598]
The quarrying of stone for building and sculpture was done by means of wooden and stone implements, by methods unknown but adequate to the working of the hardest material. Stone implements alone seem to have been used for the sculpture of idols, statues, and architectural decorations. A better idea of the excellence of the Nahuas in the art of stone-carving may be formed from the consideration of antiquarian relics in another volume than from the remarks of the early chroniclers. Most of the sculptured designs were executed in soft material, in working which flint instruments would be almost as effective as those of steel; but some of the preserved specimens are carved in the hardest stone, and must have taxed the sculptor's patience to the utmost even with hard copper chisels. The idols and hieroglyphics on which the native art was chiefly exercised, present purposely distorted figures and are a poor test of the artists' skill; according to traditional history portrait-statues of the kings were made, and although none of these are known to have survived, yet a few specimens in the various collections indicate that the human face and form in true proportions were not beyond the scope of American art; and the native sculptors were, moreover, extremely successful in the modeling of animals in stone.[599]
WORKING OF PRECIOUS STONES.
The Nahuas were no less skillful in working precious stones than gold and silver. Their Toltec ancestors possessed the same skill and used to search for the stones at sunrise, being directed to the hidden treasure by the vapor which rose from the place that concealed it. All the stones found in the country were used for ornamental purposes, but emeralds, amethysts, and turquoises were most abundant. The jewels were cut with copper tools with the aid of a silicious sand. Single stones were carved in various forms, often those of animals, and set in gold, or sometimes formed into small cups or boxes. Pearls, mother of pearl, and bright-colored shells were used with the precious stones in the formation of necklaces, bracelets, ear-rings, and other decorations for the nobles or for the idols. Various articles of dress or armor were completely studded with gems tastefully arranged, and a kind of mosaic, with which wooden masks for the idols were often covered, attracted much attention among the Spaniards. Mirrors of rock crystal, obsidian, and other stones, brightly polished and encased in rich frames, were said to reflect the human face as clearly as the best of European manufacture.[600]
Trees were felled with copper hatchets, hewn with the same instruments into beams, and dragged by slaves over rollers to the place where they were needed for building. Some of the chief idols, as for instance that of Huitzilopochtli, according to Acosta, were of wood, but wood-carving was not apparently carried to a high degree of perfection. Some boxes, furnished with lids and hinges, also tables and chairs, were made of wood, which was the chief material of weapons and agricultural implements. The authorities devote but few words to the workers in wood, who, however, after the conquest seem to have become quite skillful under Spanish instruction, and with the aid of European tools. Fire-wood was sold in the markets; and Las Casas also tells us that charcoal was burned.[601]