We must notice, however, that these innovations have fallen with great rapidity upon a vast range of industries, that they have accumulated their effects, that they have suddenly altered the currents of trade and the methods of industry, and that we have hardly learned to accommodate ourselves to one new set of circumstances before a newer change or modification has been imposed. Some inventions, of which the Bessemer steel is the most remarkable example, have revolutionized industries. Some new channels of commerce have been opened which have changed the character and methods of very important branches of commerce. We have also seen a movement of several nations to secure a gold currency, which movement fell in with a large if not extraordinary production of silver and altered the comparative demand and supply of the two metals at the same time. This movement had nothing arbitrary about it, but proceeded from sound motives and reasons in the interest of the nations which took this step. There is here no ground for condemnation or approval. Such action by sovereign nations is taken under liberty and responsibility to themselves alone, and if it is taken on a sufficiently large scale to form an event of importance to the civilized world, it must be regarded as a step in civilization. It can only be criticized by history. For the present, it is to be accepted and interpreted only as an indication that there are reasons and motives of self-interest which can lead a large part of the civilized world to this step at this time.