The last writer says, that a large collection of massive gold ornaments of very rich workmanship was long preserved in the royal treasury of Quito. But on his going there to examine them, he learned that they had just been melted down into ingots to send to Carthagena, then besieged by the English! The art of war can flourish only at the expense of all the other arts.] That they should have accomplished these difficult works with such tools as they possessed, is truly wonderful. It was comparatively easy to cast and even to sculpture metallic substances, both of which they did with consummate skill. But that they should have shown the like facility in cutting the hardest substances, as emeralds and other precious stones, is not so easy to explain. Emeralds they obtained in considerable quantity from the barren district of Atacames, and this inflexible material seems to have been almost as ductile in the hands of the Peruvian artist as if it had been made of clay. *17 Yet the natives were unacquainted with the use of iron, though the soil was largely impregnated with it. *18 The tools used were of stone, or more frequently of copper. But the material on which they relied for the execution of their most difficult tasks was formed by combining a very small portion of tin with copper. *19 This composition gave a hardness to the metal which seems to have been little inferior to that of steel. With the aid of it, not only did the Peruvian artisan hew into shape porphyry and granite, but by his patient industry accomplished works which the European would not have ventured to undertake. Among the remains of the monuments of Cannar may be seen movable rings in the muzzles of animals, all nicely sculptured of one entire block of granite. *20 It is worthy of remark, that the Egyptians, the Mexicans, and the Peruvians, in their progress towards civilization, should never have detected the use of iron, which lay around them in abundance; and that they should each, without any knowledge of the other, have found a substitute for it in such a curious composition of metals as gave to their tools almost the temper of steel; *21 a secret that has been lost - or, to speak more correctly, has never been discovered - by the civilized European. [Footnote 17: They had turquoises, also, and might have had pearls, but for the tenderness of the Incas, who were unwilling to risk the lives of their people in this perilous fishery! At least, so we are assured by Garcilasso, Com. Real., Parte 1, lib. 8, cap. 23.] [Footnote 18: "No tenian herramientas de hierro in azero." Ondegardo, Rel. Seg., Ms. - Herrera, Hist. General, dec. 5, lib. 4, cap. 4.] [Footnote 19: M. de Humboldt brought with him back to Europe one of these metallic tools, a chisel, found in a silver mine opened by the Incas not far from Cuzco. On an analysis, it was found to contain 0.94 of copper, and 0.06 of tin. See Vues des Cordilleres, p. 117.]