When we read or hear of London, we are always coming across the terms West End and East End. West and East of what? Where is the dividing-line? The dividing-place is the City, the heart of London, the oldest part of the great town. Once the City was a compact little town inside a strong wall which kept out its enemies. It was full of narrow streets, where shops stood thickly together, and over the shops lived the City merchants in their tall houses. The narrow streets and the shops are still there, but the merchants have long since gone to live elsewhere, and the walls have been pulled down. Now the City is nothing but a business quarter. It is packed with offices, warehouses, banks and public buildings, and it is the busiest part of London by day and the quietest by night. It is a wonderful sight to see the many, many thousands of people who work in the City pour in with the morning and stream out at evening. Every road, every bridge, leading to and from the City is packed with men and women, boys and girls, marching like a huge army, flowing and ebbing like the tides of the sea. In the centre of the City there is a famous open space where seven streets meet. It is famous for the buildings which surround it, and the traffic which flows through it. All day long an endless stream of omnibuses, cabs, drays, vans, carts, motor-cars, motor-buses, carriages, and every kind of vehicle which runs on wheels, pours by. So great is the crush of traffic that underground passages have now been built for people to cross from side to side, and that is a very good thing, for only the very nimble could dodge their way through the mass of vehicles. Upon one side of this space there stands a building with blank walls, not very high nor very striking in appearance. But it is the Bank of England, where the money matters of half the world are dealt with! If we went inside we should find that the Bank is built around a courtyard, into which the windows look. Thus there is no chance for burglars to break in, and besides, the Bank is guarded very carefully, for its cellars are filled with great bars of gold, and its drawers are full of sovereigns and crisp bank-notes. Upon the other side of the busy space stands the Mansion House, where the Lord Mayor of London lives during his year of office. Here are held gay feasts, and splendid processions often march up to the doors; for if a king or great prince visits London, he is always asked to visit the City, and he goes in state to a fine banquet. A third great building is the Royal Exchange, adorned with its great pillars, and here the merchants meet, and business matters affecting every corner of the globe are dealt with.