Roger North described a Newcastle railway in 1680:--"Another thing that is remarkable is their way-leaves; for when men have pieces of ground between the colliery and the river, they sell leave to lead coals over their ground; and so dear that the owner of a rood of ground will expect 20_l._ per annum for this leave. The manner of the carriage is by laying rails of timber, from the colliery down to the river, exactly straight and parallel; and bulky carts are made with four rowlets fitting these rails; whereby the carriage is so easy that the horse will draw down four or five chaldron of coals, and is an immense benefit to the coal-merchant." Who would have thought that this contrivance would have led to no large results till a hundred and fifty years had passed away? Who could have believed that "the rails of timber, exactly straight and parallel," and the "bulky carts with four rowlets exactly fitting the rails," would have changed the face, and to a great degree the destinies, of the world? If we add to the road, the canal, and the railway, the steam-boat traffic of our own coasts, we cannot hesitate to believe that the whole territory of Great Britain and Ireland is more compact, more closely united, more accessible, than was a single county two centuries ago. It may be said, without exaggeration, that it would now be impossible for a traveller in England to set himself down in any accessible situation where the post from London would not reach him in twelve hours. When the first edition of the 'Results of Machinery' was published in 1831, we said that the post from London would reach any part of England in three days; and that, "fifty years before, such a quickness of communication would have been considered beyond the compass of human means." In twenty-four years we have so diminished the practical amount of distance between one part of Great Britain and another, that the post from London to Aberdeen is carried five hundred and forty miles in little more than twenty hours. It is this wonderful rapidity of communication, in connection with the cheapness of postage, which has multiplied letters five-fold since 1839, when the penny rate was introduced. In that year the number of chargeable and franked letters distributed in the United Kingdom was eighty-two millions; in 1853 it was four hundred and ten millions. [Illustration: Locomotive-Engine Factory.]