If you went down to the river from the East End you would find many very wonderful things, but here hardly any London people from the West End go; it is so far that very few of the people who live in London have ever been there at all. The great river rolls on to the sea, and twice in every day and night the sea sends a strong tide flooding up to London, and the barges, bringing coal and straw and wood and many other things, use the tide to come up the river, for otherwise they must have a small steamboat to drag them. And by the side of the river there are great houses built right on the edge of the water, where all day long men work, either taking things out of steamers or putting other things into other steamers to go away to foreign countries. The river is covered with steamers and barges and boats, just as the streets are crowded with omnibuses and cabs and carts. Always men are working and bringing things to the great City and sending things out. If it were not so the City could not live at all, because the people must be fed and clothed, and they can't make everything they want or grow what they want to eat in London itself. Down in this part of London there are huge docks, but I am quite sure you do not know what docks are. They are basins of water, like immense ponds or lakes, shut in on all sides except for one entrance from the river, and here ships can come in and lie snugly and safely without being pushed about by the tides, and they can be painted and mended and made fit to go to sea again. One of these docks on a fine afternoon in summer is a very beautiful sight; all the tall masts and funnels of the ships are mixed up together like a forest of trees, and the blue sky peeps through them and the blue water ripples round them. When you saw this sight you would understand a little what a wonderful city London is, and how she sends her ships out to all parts of the world.