A careful police provided for the health and cleanliness of the city. A thousand persons are said to have been daily employed in watering and sweeping the streets,[324] so that a man--to borrow the language of an old Spaniard--“could walk through them with as little danger of soiling his feet as his hands.”[325] The water, in a city washed on all sides by the salt floods, was extremely brackish. A liberal supply of the pure element, however, was brought from Chapoltepec, “the grasshopper’s hill,” less than a league distant. It was brought through an earthen pipe, along a dike constructed for the purpose. That there might be no failure in so essential an article when repairs were going on, a double course of pipes was laid. In this way a column of water of the size of a man’s body was conducted into the heart of the capital, where it fed the fountains and reservoirs of the principal mansions. Openings were made in the aqueduct as it crossed the bridges, and thus a supply was furnished to the canoes below, by means of which it was transported to all parts of the city.[326] While Montezuma encouraged a taste for architectural magnificence in his nobles, he contributed his own share towards the embellishment of the city. It was in his reign that the famous calendar stone, weighing, probably, in its primitive state, nearly fifty tons, was transported from its native quarry, many leagues distant, to the capital, where it still forms one of the most curious monuments of Aztec science. Indeed, when we reflect on the difficulty of hewing such a stupendous mass from its hard basaltic bed without the aid of iron tools, and that of transporting it such a distance across land and water without the help of animals, we may well feel admiration at the mechanical ingenuity and enterprise of the people who accomplished it.[327] Not content with the spacious residence of his father, Montezuma erected another on a yet more magnificent scale. It occupied, as before mentioned, the ground partly covered by the private dwellings on one side of the _plaza mayor_ of the modern city. This building, or, as it might more correctly be styled, pile of buildings, spread over an extent of ground so vast that, as one of the Conquerors assures us, its terraced roof might have afforded ample room for thirty knights to run their courses in a regular tourney.[328] I have already noticed its interior decorations, its fanciful draperies, its roofs inlaid with cedar and other odoriferous woods, held together without a nail, and, probably, without a knowledge of the arch,[329] its numerous and spacious apartments, which Cortés, with enthusiastic hyperbole, does not hesitate to declare superior to anything of the kind in Spain.[330]