The chinampas are formed on the fresh-water mud on each side of the canal of Chalco, from the southeast corner of the city to a point near the ancient village of Mexicalzingo, and for a part of the way they are on both sides of that beautiful but now neglected _paseo_, Las Vegas; there are also a small number near the causeway of Tacubaya, and in other parts of the marsh; their number might be extended without limit if it was not regulated by the demands of the vegetable market of Mexico. Chinampas are formed by laying upon the soft mud a very thick coating of reeds, or rather rushes, in the form and about the size of one of our largest canal scows. Between two chinampas a space of about half the width of one is left, and from this open space the mud is dipped up and poured upon the bed of dry rushes, where it dries, and forms a rich "muck" soil, which constitutes the garden. As the specific gravity of this garden is much greater than that of the water, or of the substratum of mud and water combined, it gradually sinks down into its muddy foundation; and in a few years it has to be rebuilt by laying upon the top of the garden a new coating of rushes and another covering of mud. Thus they have been going on for centuries, one garden being placed upon the top of another, and a third placed over all, so soon as the second gives signs of being swallowed up in the all-devouring mud. The gardeners navigate the open space between their islands with light boats; and during the short hours of the morning, the market-boat alongside each island is loaded with a cargo of vegetables, fruits, and flowers, which are to be displayed in the great market of Santa Anna. More pleasing than a drive on the _paseo_ is a boat-ride down the canal of Chalco at eventide, when the proprietor of each of these little estates is seen standing in the canal alongside, and throwing upon his thirsty plants a plentiful supply of the tepid canal water, which, from every leaf and flower, reflects back the rays of a setting sun, that have penetrated the long shadows of the trees of Las Vegas. Some of the chinampas have small huts upon them, where a gardener lives, who watches over two or three of these little properties. Sometimes also shrubs, and even trees, are planted along the edges, which yield both fruits and flowers, and serve to keep the dry earth from falling into the water. When looking at one of the largest and best cared for chinampas, the beholder can hardly divest himself of the idea that it is a floating island, and might well have been the residence of Calypso.