At first sight it seems impossible for water to run up hill; and yet, by a little ingenuity, this is easily done; for, put water into what you please, and one side or end of it will always rise as high as the other. It is by knowing and thinking about this, that clever men have contrived to supply whole cities with water, and even to send it up into the highest rooms of a house. They first of all make a great reservoir, or collection of water, on some neighbouring hill, from which pipes are carried, underground, to all the houses they wish to supply; the water in that end of the pipes next the town, always rising as high as that in the reservoir at the other end of them. If they cannot find a convenient spring, sufficiently high, they force the water to a proper height by pumps and steam-engines; and by these inventions, do with ease, what the best ancient philosophers might have thought impossible. When one of the great pipes, which run through the streets of London, happens to burst, the water soon forces up the pavement, and a fountain is produced. 85. The London Docks [Picture: The London Docks] Are situated in Wapping, between Ratcliffe Highway and the Thames. One of the docks is so large, that it covers more than twenty acres of ground, being 1262 feet long, and 699 feet wide. It was first opened on the 31st of January, 1805. The new dock covers a space of fourteen acres. There are also immense warehouses. One of them is 762 feet long, and 160 feet wide, a representation of which was too large to introduce into our picture; but we have given a view of the grand entrance, with a ship going into the docks, to be unladen of her merchandise, which will be taken care of in one of those warehouses, till it is sold for public use. 86, 87. Greenwich and Chelsea Hospitals, and Pensioners, [Picture: Greenwich and Chelsea Hospitals, and Pensioners]