The balustrade of the balcony is of a light marble with faint red mottling, and in front of it is a boiling pool of water at the level of the hand-rail. A large volume of water overflows the curved edge of this pool and falls twenty feet into a basin beneath, the first of a series of nine whose overflows in successive steps form the cascade technically known as a "château d'eau," the finest of which description of ornamental waterworks is at the Château St. Cloud, one of the mementos of the fatal luxury which precipitated the Revolution of 1789. The cascade of St. Cloud plays once a month for half an hour--that at the Exposition during the whole day. From one jet at St. Cloud issue five thousand gallons per minute: the supply at the Exposition is twenty-four thousand cubic feet per hour. Most of this water runs over the edge of the balcony-pool, and the fall of fifty-six cubic feet per second a distance of twenty feet creates no mean roar and mist in the archway beneath the balcony, where visitors walk behind the falls and look through the sheet of water. It is not fair to compare at all points the cascades of the Exposition and St. Cloud. The amount of water may probably not be greatly different, but the fantastic profusion of spiratory objects and long succession of overflow basins and urns in the works at the château has no parallel in those of the Trocadéro. The cascades of St. Cloud are disappointing: the object should be to add to landscape effect by water in motion, and the principle is entirely missed when the water is made a mere accessory to a series of stone steps, jars and monsters. Steps are made to walk upon, jars to hold water. An interminable series of either with water poured over them is not the work of a genius. If the first suggestion to the mind be that a thing is a stairway, the fact that it is made too wet to walk upon does not constitute it a beautiful cascade. A row of jars on pedestals around a grass-plat has a pretty effect, because they do or may hold flowers, but to set several rows of them on a hillside and turn on the water is not art. As an admirable illustration of fantasy well wrought out the Fountain of Latona at Versailles may be cited. There Latona, having appealed to Jupiter against the inhabitants of Argos, who had deprived her of water, is deluged by jets from the unfortunates, who appear in various degrees of transformation into frogs.