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 evil, when the houses stood on piles so elevated that boats might pass under them; when the streets were canals, and the ordinary mode of communication was by water. But it became more disastrous, as these canals, filled up with the rubbish of the ruined Indian city, were supplanted by streets of solid earth, and the foundations of the capital were gradually reclaimed from the watery element. To obviate this alarming evil, the famous drain of Huehuetoca was opened, at an enormous cost, in the beginning of the seventeenth century, and Mexico, after repeated inundations, has been at length placed above the reach of the flood.1 But what was gained to the useful, in this case, as in some others, has been purchased at the expense of the beautiful. By this shrinking of the waters, the bright towns and hamlets once washed by them have been removed some miles into the interior, while a barren strip of land, ghastly from the incrustation of salts formed on the surface, has taken the place of the glowing vegetation which once enamelled the borders of the lake, and of the dark groves of oak, cedar, and sycamore which threw their broad shadows over its bosom.

The chinampas, that archipelago of wandering islands, to which our attention was drawn in the last chapter, have also nearly disappeared. These had their origin in the detached masses of earth, which, loosening from the shores, were still held together by the fibrous roots with which they were penetrated. The primitive Aztecs, in their poverty of land, availed themselves of the hint thus afforded by nature. They constructed rafts of reeds, rushes, and other fibrous materials, which, tightly knit together, formed a sufficient basis for the sediment that they drew up from the bottom of the lake. Gradually islands were formed, two or three hundred feet in length, and three or four feet in depth, with a rich stimulated soil, on which the economical Indian raised his vegetables and flowers for the markets of Tenochtitlan. Some of these chinampas were even firm enough to allow the growth of small trees, and to sustain a hut for the residence of the person that had charge of it, who, with a long pole resting on the sides or the bottom of the shallow basin, could change the position of his little territory at pleasure, which with its rich freight of vegetable stores were seen moving like some enchanted island over the water.2

The ancient dikes were three in number. That of Iztapalapan, by which the Spaniards entered, approaching the city from the