Between Paris and Brussels obstacles of many kinds exist. First of all, there is distance, which entails loss of time, and we must either submit to this ourselves, or pay another to submit to it. Then come rivers, marshes, accidents, bad roads, which are so many difficulties to be surmounted. We succeed in building bridges, in forming roads, and making them smoother by pavements, iron rails, etc. But all this is costly, and the commodity must be made to bear the cost. Then there are robbers who infest the roads, and a body of police must be kept up, etc.Now, among these obstacles there is one which we have ourselves set up, and at no little cost, too, between Brussels and Paris. There are men who lie in ambuscade along the frontier, armed to the teeth, and whose business it is to throw difficulties in the way of transporting merchandise from the one country to the other. They are called Customhouse officers, and they act in precisely the same way as ruts and bad roads.