There are seven millions of people in London. That does not give any idea of the real number, but if you were to begin now and count hard for three days and nights, you would not have counted a million then, even if you never stopped to eat or to sleep. Just think of it, that great crowd of people all wanting to be fed, and many of them wanting three good meals every day! If all the carts in the world were to be marching into London the whole time, you would think they could hardly bring food enough for this multitude of people. Yet somehow it is done, and it does not seem to be very difficult either. I think I hear someone saying, 'But there are the shops; people can go and buy there.' Yes, they can, of course, but where do the shopmen get their stuff from? Where does all the meat come from, and the fruit and the flowers and vegetables, and all the things that must be kept fresh? Where does the shopman buy them? The shopman gets them from the markets, and the markets get them from the country. There are many great markets, and to-day we will visit three of them--that where we can see the meat, and that where the flowers and vegetables are, and that where the fish are. The flower market is much the nicest, of course, so we will keep it for the last. The fish market is down close by the river, just where you would expect it to be. If you want to see it you must not mind getting up very early, long before any cabs or omnibuses are about--in fact, it will be very difficult to get there at all unless you can bicycle or can walk a long way without being tired.