A practical "man of the times," with more common sense than poetry in his composition, must grieve as he looks at the great advantages here possessed for drainage and irrigation which are unimproved. There is not a spot in the whole valley that is not capable of the most perfect drainage,[28] while basins have been formed by nature in the highest points, from which irrigation could be supplied to the whole valley; but decay and neglect--fitting types of the social condition of the people--every where exhibit themselves. Water stands in all the narrow canals or ditches that occupy the middle of the streets, for the want simply of a sewer to draw it down to the level of the Tezcuco. Once a year the flags are taken off from the covered ditches, and the mud is dipped out, while a bundle of hay, tied to the tail of a dirt-cart, is daily dragged through the open ones. I have spoken only of the lower division of this valley--the valley in which the city stands. If we consider the two partly separated valleys as one, the whole will constitute an oval basin 75 miles long from north to south, with an average width from east to west of 20 miles. Two thirds of the southern valley is a marsh, and might well be called the "Montezuma Marsh," it so strikingly resembles the marsh of that name in the State of New York, though the whole body of ponds and marshes of this valley contains much less water than its northern namesake. The stage-road from Vera Cruz crosses this marsh for fourteen miles, and has a great number of small stone bridges, beneath which the water runs with considerable current toward the north, on account of the difference of level between the southern fresh-water ponds and the lower salt-water ponds, as in the days of Cortez. There are occasional dry spots, and now and then there is open water; but the greater portion is filled with marsh grass, and furnishes good feeding for the droves of cattle that daily frequent it for that purpose. The ancient village of Mexicalzingo, or "Little Mexico," the traditional home of the Aztecs before they built Mexico, is situated on one of the dry spots, slightly elevated above the level of the fresh water; and on another dry spot or island, six miles distant, stands the famous city of Mexico itself, resting on piles driven into a foundation of soft earth. The canal of Chalco commences at the northerly extremity of the Xochimulco, and, passing by Mexicalzingo and the floating gardens, continues along the eastern front of the city, and empties itself into the salt (_tequisquite_) pond of Tezcuco, having received as a tributary the canal of Tacubaya, which passes along the southern boundary of the city. THE LAKES OF THE VALLEY.