In many parts the sea has made itself a hidden way, and runs its course for miles under the rocks, appearing again at great distances in one of the interior inland cities, perhaps at the bottom of a deep ravine or open space; and the waters are often raised and collected for use and ornament in fountains and artificial cascades called water-lifts: whilst springs of fresh water gush out of the rocks, affording refreshment to the sun-parched and many-coloured grasses, flowers, and vegetation. Great cataracts and artificial cascades often form the background to a great building or colossal statue. The effect of these large masses of water viewed from all parts is extremely grand and beautiful. Sometimes the ravines, rivers, cataracts, and sea-arms are passed by huge bridges of the natural rocks, perforated by the sea, or opened by man to render navigation possible. Sometimes bridges miles in length are thrown across a great cataract or immense chasm where the rocks have been relentlessly torn asunder by the lightning and other electrical disturbances. All the large bridges are covered with houses and gardens, which at a distance seem air-suspended cities, hanging without support over rivers, cataracts, large cities, and aggregations of houses. Everything conducive to health is attended to: the supply of water to every part of the city is unlimited, and in each house, whether of rich or poor, is a bath, for sea and for fresh water. We have "violet streams," which run for miles over beds of violets white and blue. The water of these is preserved in tanks erected at the end of the streams, trenches being cut to assist the flow. It has a delicious flavour, and is used for various beverages, but not for culinary purposes, since, when mixed with certain things, it turns black and loses its fragrance. Trees, plants, and flowers perfume the air with their fragrance; whilst birds of endless variety and richest plumage have their nests in the tall and wide-spreading trees of varied-coloured foliage and fill the air with their music. In the trees are placed artificial nests to entice the birds; these invite others, which build their nests spontaneously. The trees are large, their branches and rich foliage spread themselves in graceful lines to a long distance on every side and afford pleasing shade, their gauzy leaves subduing the light and producing the effect of soft rainbow tints. The trees also emit perfume. The music of the birds harmonizes with the refreshing sounds of the running waters, cascades, and fountains; and that the effect on the mind of these beautiful harmonies may not be disturbed, the wheels of our chariots as well as the horses' hoofs are bound with a peculiar hide which, besides possessing great toughness and durability, has the property of deadening sound. Thus none but the most agreeable sounds reach the ear, whilst the senses are charmed with aromatic odours and the eye is pleased with beauty of every kind.