I repeat, then, that the modern industrial and commercial system, dealing as it does with vast movements which no one mind can follow or compass in their ramifications and which are kept in harmony by natural laws, demands steadily advancing, clear, and precise knowledge of economic laws; that this knowledge must banish prejudices and traditions; that it must conquer baseless enthusiasms and whimsical hopes. If it does not accomplish this, we can expect but one result--that men will chase all sorts of phantoms and impossible hopes; that they will waste their efforts upon schemes which can only bring loss; and that some will run one way and some another until society loses all coherence, all unanimity of judgment as to what is to be sought and how to attain to it. The destruction of capital is only the least of the evils to be apprehended in such a case. I do not believe that we begin to appreciate one effect of the new civilization of the nineteenth century, _viz._, that the civilized world of to-day is a unit, that it must move as a whole, that with the means we have devised of a common consent in regard to the ends of human life and the means of attaining them has come also the _necessity_ that we should move onward in civilization by a common consent. The barriers of race, religion, language, and nationality are melting away under the operation of the same forces which have to such an extent annihilated the obstacles of distance and time. Civilization is constantly becoming more uniform. The conquests of some become at once the possession of all. It follows that our scientific knowledge of the laws which govern the life of men in society must keep pace with this development or we shall find our social tasks grow faster than our knowledge of social science, and our society will break to pieces under the burden. How, then, is this scientific knowledge to grow? Certainly not without controversy, but certainly also not without coherent, steady, and persistent effort, proceeding on the lines already cut, breaking new ground when possible, correcting old errors when necessary.