1. As the change in the relative value of the precious metals is by far the most difficult and most important of the features of this period, it is quite what we might have expected that the ill-trained and dilettante writers should have pounced upon it as their special prey. The dabblers in philology never attempt anything less than the problem of the origin of language. Every teacher knows that he has to guard his most enthusiastic pupils against precipitate attempts to solve the most abstruse difficulties of the science. The change in the value of the precious metals which is going on will no doubt figure in history as one of the most important events in the economic history of this century. It will undoubtedly cost much inconvenience and loss to those who are in the way of it, or who get in the way of it. It will, when the currency changes connected with it are accomplished, prove a great gain to the whole commercial world. The nations which make the change do so because it is important for their interests to do it. Now, suppose that it were possible for those who are frightened at the immediate and temporary inconveniences, to arrest the movement--the only consequence would be that they would arrest and delay the inevitable march of improvement in the industrial system. 2. The second field, which is an especial favorite with the class of writers which I have described, is that of prognostications as to what developments of the economic system lie in the future. Probably every one has notions about this and every one who has to conduct business or make investments is forced to form judgments about it. There is hardly a field of economic speculation, however, which is more barren. 3. The third field into which these writers venture by preference is that of remedies for existing troubles. The popular tide of medicine is always therapeutics, and the less one knows of anatomy and physiology the more sure he is to address himself exclusively to this department, and to rely upon empirical remedies. The same procedure is followed in social science, and it is accompanied by the same contempt for scientific doctrine and knowledge and remedies. To bring out the points which here seem to me important, it will be necessary to go back for a moment to some facts which I have already described.