Show the immensity of london it if the city of london wera were surrounded by a wall having a north gate a south gate an east cast gate and a west gate and each of the four gates were of sufficient width to allow a column of persons to pass out freely four abreast and a peremptory necessity required tho immediate evacuation of the city it could not bo ba accomplished under thirty six hours by the expiration of which time the head of the four columns would have bavo advanced a no less distance than miles from their respective gates the head of ot the column moving north would havo have reached lincoln while the last file was passing out of the london gat gate |