10. _Protectionism, then, is an_ ISM; that is, it is a doctrine or system of doctrine which offers no demonstration, and rests upon no facts, but appeals to faith on grounds of its _a priori_ reasonableness, or the plausibility with which it can be set forth. Of course, if a man should say: “I am in favor of protective taxes because they bring gain to me. That is all I care to know about them, and I shall get them retained as long as I can”--there is no trouble in understanding him, and there is no use in arguing with him. So far as he is concerned, the only thing to do is to find his victims and explain the matter to them. The only thing which can be discussed is the doctrine of national wealth by protective taxes. This doctrine has the forms of an economic theory. It vies with the doctrine of labor and capital as a part of the science of production. Its avowed purpose is impersonal and disinterested--the same, in fact, as that of political economy. It is not, like free trade, a mere negative position against an inherited system, to which one is led by a study of political economy. It is a species of political economy, and aims at the throne of the science itself. If it is true, it is not a corollary, but a postulate, on which, and by which, all political economy must be constructed. 11. But then, lo! if the dogma which constitutes protectionism--_national wealth can be produced by protective taxes and cannot be produced without them_--is enunciated, instead of going on to a science of political economy based upon it, the science falls dead on the spot. What can be said about production, population, land, money, exchange, labor and all the rest? What can the economist learn or do? What function is there for the university or school? There is nothing to do but to go over to the art of legislation, and get the legislator to put on the taxes. The only questions which can arise are as to the number, variety, size, and proportion of the taxes. As to these questions the economist can offer no light. He has no method of investigating them. He can deduce no principles, lay down no laws in regard to them. The legislator must go on in the dark and experiment. If his taxes do not produce the required result, if there turn out to be “snakes” in the tariff which he has adopted, he has to change it. If the result still fails, change it again. Protectionism bars the science of political economy with a dogma, and the only process of the art of statesmanship to which it leads is eternal trial and failure--the process of the alchemist and of the inventor of perpetual motion. (_D_) DEFINITION OF FREE TRADE AND OF A PROTECTIVE DUTY.