The first couple lead round the room until the leader reaches the bottom left-hand corner. There, instead of turning upwards at right angles up the side of the room, the first couple should file to the right and march in a line parallel with the advancing couples, but in an opposite direction across the room; as each couple successively arrives at the same corner, they file to the right and follow their leader. When the leader has got across the room, the first couple should file to the left, and march straight across back again, and so on, forming a serpentine line of march backwards and forwards across the room until the top of the room is reached. To make this effective, it requires a considerable number of couples, so that there will be at least four lines, constantly passing each other in opposite directions, and forming a very pleasing appearance. When the first couple reach the top of the room, they lead the march round the room again, until all the couples are following them in regular column.