The Lake Tezcuco has retired since the period of the conquest, nearly three miles from the city of Mexico, and the city at present, instead of being enveloped by waters, stands solely on the margin of the strait or channel which connects the lakes with each other. Lake Tezcuco, the sheet of water nearest to the city, is saturated with salts, and hence was called by Cortez, who supposed that it ebbed and flowed, the sea of Anahuac; it is 7468 feet above the ocean, and is only from ten to sixteen feet in depth. In the dry seasons it is so drained by evaporation, that the canoes find great difficulty in navigating it; there is also another cause, which operates to decrease this celebrated lake; a cut has been made through the mountains to throw off the superabundant waters of the two upper lakes of Zumpango and San Christoval, which prevents those lakes from nourishing Tezcuco. Lake Tezcuco, covers a space equal to ten square leagues. A strait or channel connects Tezcuco with the lakes of Xochimilco and Chalco to the south of the city, which are not so broad as Tezcuco, but are more interesting; in Chalco there are several islands of large size, famous for the retreat of the ancient Aztecs. These lakes are of fresh water, and occupy a space of six and a half square leagues; the first-named is the most pure; on their surfaces are the celebrated floating gardens of the Mexicans, which supply the capital with fruits and vegetables. They are formed on rafts of reeds and brush-wood covered with soil, which is constantly watered from the surrounding lake, and the earth, which is strongly impregnated with muriate of soda, becomes by this continual washing, at last very free from salt and fit for vegetation. They are moved from one place to another by men with poles, and some of them contain watch-huts; where the proprietor or his deputy resides to overlook the gardens; pease, beans, chilis, potatoes, artichokes, cabbage, &c. pimento and flowers of all sorts luxuriate on these moving gardens, and afford both pleasure and profit to the inhabitants of the metropolis; many of them have become fixed on the borders of the lake, on account of the general decrease of the waters. The remaining great lakes to the north, are San Christoval and Zumpango; the former has an expanse of three and a half square leagues; the latter of one and a quarter. There are two mineral springs near Mexico, at which baths have been constructed, and near one of them the earth is so impregnated with salts, that regular salt pans are established for the supply of the capital.