The silk-worms of Mexico are in a state of nature; but produce a beautiful and strong cocoon. The cochineal insect forms one of the principal articles of Mexican commerce; and great pains are taken in rearing it. The mineral productions, are gold, silver, copper, tin, the mines of which are near the capital; lead, iron, quicksilver, sulphur, alum, vitriol, cinnabar, ochre, and a sort of earth, resembling white lead. Asphaltum and amber are found on the coasts. Among the precious stones and gems of Mexico, are a few diamonds, topazes, emeralds, amethysts, the stone called cats-eye, turquoises, cornelians, &c. Chrystal is also found in the mountains. Jasper, and various marbles, alabaster in particular, and a red stone, called tetzontli, which is porous and light, yet firm, is much used in the capital, where the foundations being marshy, they wish not, in many spots, to overload the piles on which they are erected. The loadstone is found to the north-west of the province; mica is common, and a fine sort was, after being burnt and powdered, used by the Mexicans in their paintings. The itzli stone is the most curious of the productions of the Mexican quarries; it has a glossy appearance, is semi-transparent, and generally of a black colour, though sometimes varying to dark blue and dirty white; it has been assimilated to the obsidian of the ancients, and declared to be the obsidian, or volcanic glass of modern mineralogy. The Mexican artists fabricated it into mirrors, razors, spearheads, knives, lancets, and all sorts of fine tools. The natives, that is to say, the aborigines or Indians, are well made, above the middle size, with complexions of an olive colour, narrow foreheads, black eyes, firm, regular, and fine teeth, coarse, black shining hair, with very little beard or hair on the trunk, or legs and arms; and it is remarked, that few deformed people are seen amongst them.