According to this view of the matter there is no more reason to be satisfied with generalities in economics than in physics. Some writers on economic subjects, who pride themselves upon scientific reluctance, remind me of Mr. Brooks, in “Middlemarch.” They believe in things up to a certain point, and are always afraid of going too far. They would be careful about the multiplication table, and not bear down too hard on the rule of three. They do not discriminate between care in the application of rules, and confidence in scientific results; or between harshness in personal relations and firm convictions in science. The more we come to understand economic science the more clear it is that we are dealing with only another presentation of matter and force, that is to say, with quantity and law, so that we have mathematical relations, and have every encouragement to severity and exactitude in our methods. When, therefore, it is said that the economists do not pay sufficient heed to the power of legislation, that is no stopping place for the argument any more than it would be in physics to say that sufficient heed was not paid to friction. The question would then arise: What is the force of legislation? Let us study it, just as we would go on to study friction in mechanics. When it is loosely said (as if that dismissed the subject) that men have passions and emotions and do not act by rule, the objection is not pertinent at all. It is connected with another wide and common, but very erroneous notion, that economic laws involve some stress of obligation on men to do or abstain from doing certain things. I suppose this notion arises from the classification of political economy amongst the moral sciences. Economic laws only declare relations of cause and effect which will follow, if set in motion. Whether a man sets the sequence in motion at all or not, and if he does so, whether he does it from passion or habit or upon reflection, is immaterial. Such is the case, as I understand it, with all sciences. They simply instruct men as to the laws of this world in which we live that they may know what to expect if they take one course or another, or they instruct men so that they may understand the relations of phenomena of forces beyond our control so that we may foresee and guard ourselves against harm. It follows from all this that I demand and aim at just as close thinking in political economy as in any other science. I think we must try to get as firm hold of principles and fundamental laws as we can, and that, especially in the face of speculative propositions, we ought to cling to and trust the firmly established laws of the science.