3d. The irregularity and the want of experience and capital in those who have undertaken the exploration and the extraction of metals, which has occasioned the abandonment of this class of speculations whenever they presented any difficulties, or commenced to be more costly by failing to produce metals upon the surface of the earth. Some certain speculations which have been directed with regard to the rules which regulate mineral industry, and have been prosecuted with capital, have well compensated the labors and efforts of the proprietors. Gold and silver, as above said, are not the only mineral productions of Sonora. In the part of Muchachos, situated in the Sierra Madre, between Tueson and Tubac, and in Mogollon, a place situated in the mountains of Apuchuria, in those of Papagueria, and near the Colorado, are found great masses of virgin iron, and abundant veins of the same metal. Cinnabar was discovered in 1802 in the hill of Santa Teresa, situated in the _mineral_ of Rio Chico; and in the hills which are at the north of the Colorado, it has been found in the past age. Copper is also found in Antunes, Tonuco, Bacauchi, Pozo de Crisante, Sierra de Guadalupe, Sierra de la Papagueria, and particularly in the Couanea, from whence have been extracted great quantities of this metal, with a great ley of gold. Metals of lead (_metales plomosos_) abound in Agua Caliente, Alamo-Muerto, La Papagueria, Arispe, and La Cieneguilla. From these two last points have been taken considerable quantities of them, for supplying all other mines of the state [to aid in fusion], and for munitions of war. Copperas, or sulphate of iron, is abundant in San Javier, San Antonio de la Huerta, and Agua Caliente. In the first of these placers a vein runs from south to north, from pieces of which, dissolved in water, there results a tint which, by evaporation, forms into grains, and produces the same effect as the tint of China. In Cucurpe is _amianto_, or incombustible crystal, which the ancients so much valued. Marbles of various classes and colors, as well as alabasters and jaspers, are found in Opasura, Hermosillo, Uores, La Campana, and other points; but we do not know as yet the place from which the Aztecs obtained the beautiful reddish marble which they used in the construction of their divinity of Chapultepec, which is preserved in the National Museum, and which, according to all conjectures and probabilities, proceeded from the quarries of marble of that state. There are quarries of the stone of chrispa, and even the magnet in Alamas, Hermosillo, in Sierras of the frontier, and in the causada of Barbitas, ten leagues distant from Hermosillo, near the route of La Cieneguilla. Muriate and carbonate of soda, saltpetre, or nitrate of potassa, are found in the margin of the rivers which empty into the Gulf of Cortez [of California], and particularly in the mouths of the Colorado. B. REPORT ON THE MINERAL RICHES OF CHIHUAHUA.