Yet they did not attempt to penetrate into the bowels of the earth 'by sinking a shaft, but simply excavated a cavern in the steep sides of the mountain, or, at most, opened a horizonal vein of moderate depth. They were equally deficient in the knowledge of the best means of detaching the precious metal from the dross with which it was united, and had no idea of the virtues of quicksilver,--a mineral not rare in Peru, as an amalgam to effect this decomposition.22 Their method of smelting the ore was by means of furnaces built in elevated and exposed situations, where they might be fanned by the strong breezes of the mountains. The subjects of the Incas, in short, with all their patient perseverance, did little more than penetrate below the crust, the outer rind, as it were, formed over those golden caverns which lie hidden in the dark depths of the Andes. Yet what they gleaned from the surface was more than adequate for all their demands. For they were not a commercial people, and had no knowledge of money.23 In this they differed from the ancient Mexicans, who had an established currency of a determinate value. In one respect, however, they were superior to their American rivals, since they made use of weights to determine the quantity of their commodities, a thing wholly unknown to the Aztecs. This fact is ascertained by the discovery of silver balances, adjusted with perfect accuracy, in some of the tombs of the Incas.24But the surest test of the civilization of a people--at least, as sure as any--afforded by mechanical art is to be found in their architecture, which presents so noble a field for the display of the grand and the beautiful, and which, at the same time, is so intimately connected with the essential comforts of life. There is no object on which the resources of the wealthy are more freely lavished, or which calls out more effectually the inventive talent of the artist. The painter and the sculptor may display their individual genius in creations of surpassing excellence, but it is the great monuments of architectural taste and magnificence that are stamped in a peculiar manner by the genius of the nation. The Greek, the Egyptian, the Saracen, the Gothic,--what a key do their respective styles afford to the character and condition of the people! The monuments of China, of Hindostan, and of Central America are all indicative of an immature period, in which the imagination has not been disciplined by study, and which, therefore, in its best results, betrays only the illregulated aspirations after the beautiful, that belong to a semi-civilized people.
The Peruvian architecture, bearing also the general characteristics of an imperfect state of refinement, had still its peculiar character; and so uniform was that character, that the edifices throughout the country seem to have been all cast in the same mould.25 They were usually built of porphyry or granite; not unfrequently of brick. This, which was formed into blocks or squares of much larger dimensions than our brick, was made of a tenacious earth mixed up with reeds or tough grass, and acquired a degree of hardness with age that made it insensible alike to the storms and the more trying sun of the tropics.26 The walls were of great thickness, but low, seldom reaching to more than twelve or fourteen feet in height. It is rare to meet with accounts of a building that rose to a second story.27The apartments had no communication with one another, but usually opened into a court; and, as they were unprovided with windows, or apertures that served for them, the only light from without must have been admitted by the doorways. These were made with the sides approaching each other towards the top, so that the lintel was considerably narrower than the threshold, a peculiarity, also, in Egyptian architecture. The roofs have for the most part disappeared with time.
Some few survive in the less ambitious edifices, of a singular bell-shape, and made of a composition of earth and pebbles. They are supposed, however, to have been generally formed of more perishable materials, of wood or straw. It is certain that some of the most considerable stone-buildings were thatched with straw. Many seem to have been constructed without the aid of cement; and writers have contended that the Peruvians were unacquainted with the use of mortar, or cement of any kind.28 But a close, tenacious mould, mixed with lime, may be discovered filling up the interstices of the granite in some buildings; and in others, where the wellfitted blocks leave no room for this coarser material, the eye of the antiquary has detected a fine bituminous glue, as hard as the rock itself.29The greatest simplicity is observed in the construction of the buildings.
which are usually free from outward ornament; though in some the huge stones are shaped into a convex form with great regularity, and adjusted with such nice precision to one another, that it would be impossible, but for the flutings, to determine the line of junction. In others, the stone is rough, as it was taken from the quarry, in the most irregular forms, with the edges nicely wrought and fitted to each other. There is no appearance of columns or of arches; though there is some contradiction as to the latter point. But it is not to be doubted, that, although they may have made some approach to this mode of construction by the greater or less inclination of the walls, the Peruvian architects were wholly unacquainted with the true principle of the circular arch reposing on its key-stone.30The architecture of the Incas is characterized, says an eminent traveller, "by simplicity, symmetry, and solidity."31 It may seem unphilosophical to condemn the peculiar fashion of a nation as indicating want of taste, because its standard of taste differs from our own. Yet there is an incongruity in the composition of the Peruvian buildings which argues a very imperfect acquaintance with the first principles of architecture.
