This city, though on a marshy soil, is in general healthy, and the black vomit or yellow fever is here hardly known; but consumptions, apoplexy, agues, fever, and pleurisy, are not uncommon. The worst disorder to which the inhabitants of Mexico are subject appears to be what they denominate “flato” or “flatus;” the unhappy patients appearing in a state of madness, and have hot and shivering fits as in the ague; convulsions, and hysteric affections also accompany this strange disorder; which has been supposed to arise from the great quantity of spice they use in their food, and from the excessive use of tobacco. This extraordinary city attracts the notice of Europeans from its curious situation, as well as from the remembrances attached to its name. It is placed on a plain, the height of which above the level of the sea is 6900 feet, near the banks of the lakes Tezcuco and Chalco, which are about ninety miles in circumference; the waters of the latter are salt, of the former fresh; they communicate with each other, and contain only two sorts of fish, one of which is of very peculiar organization. The city at a distance, appears to rise from the waters of the former lake; the banks of which are beautified with the most enchanting village scenery; on the opposite side of the lake, a luxuriant and highly cultivated valley is contrasted with the towering summits of the enormous mountains, emitting flame and smoke, in regions where eternal snow and winter reigns. This extensive plain is covered with flax, hemp, cotton, tobacco, sugar, indigo, &c.; and furnishes the markets of the city with abundance of vegetables, meat, fruits, and poultry, and reaches to the mountains, whose bases repose on its bosom. These mountains are diversified into every form that imagination can present, and are clothed with cedars, shrubs, and plants, and contain in their bowels precious jewels and minerals. The plain extends on all sides of the city and of the Lakes Tezcuco and Chalco; but on the eastern-side of the latter it is not so prolific, owing to the saline exhalations from the waters. On the lower parts of the mountains, farms, country-seats and romantically situated cottages are seen; and the whole plain appears well watered by numerous canals and rivulets. To the north of the town, near the suburbs, is the promenade, or Alameda; it is surrounded by a rivulet, and is in the shape of a large square, with a basin of water and fountain in the middle. From this bason eight walks strike out, each bordered by two rows of trees: there are also several other public walks, but the ground, in the immediate neighbourhood of Mexico, is full of rivulets and canals, and rather swampy.