From the upper windows of the White Tower we can see the river crowded with ships and steamers and barges, and on a fine day it is a most beautiful sight. But the most striking thing in the view is the Tower Bridge. "This is a new bridge, and it has two great towers rising one on each side, as it seems, to the sky, and the bridge lies across low down between those towers. But when a big ship comes and wants to get up the river under the bridge, what is to be done? The bridge is not high enough! Well, what does happen is this--and I hope that every one of you will see it one day, for it is one of the grandest things in London: a man rings a bell, and the cabs, and carriages, and carts, and people who are on the bridge rush quickly across to the other side, and when the bridge is quite empty, then the man in the tower touches some machinery, and slowly the great bridge, which is like a road, remember, rises up into the air in two pieces, just as you might lift your hands while the elbows rested on your knees without moving, and the beautiful ship passes underneath, and the bridge goes back again quite gently to its place. This bridge has been called the Gate of London, and it is a good name, for it looks like a giant gate over the river." IN LONDON TOWN--II. It is quite easy to find your way to St. Paul's Cathedral, for the splendid dome of the great church springs high above the highest roof of the City, and the gilt cross on its dome glitters in the sun 400 feet above the pavement below. It is not a very old building, for it was raised after the Great Fire of 1666, the fire which laid the City in ruins and destroyed the old cathedral. It was built by a great architect, Sir Christopher Wren. He lies buried in the cathedral, and over his tomb is a Latin inscription which means, "If thou dost seek my monument, look around thee." You see the meaning of this and look around, and acknowledge that the noble church is indeed a splendid testimony to the skill of him who built it. As you walk round the place, you find many other monuments to famous men. Nelson lies here and Wellington, our greatest sailor and our greatest soldier, and Dr. Johnson, the famous scholar. Here and there are battle-flags, the colours of famous regiments, decking the walls. Torn by shot and stained with blood, they speak of fierce battles where the men who bore them were in the thickest of the fight, but now they hang in the silence of the great cathedral, mute witnesses of Britain's greatest victories. [Illustration: LONDON ST. PAUL'S AND LUDGATE HILL]