Excerpt: ...is that the phenomena with which we have to deal are so complex, and our power of arranging them so as to unravel the complexity is so limited, that the direct method of observation breaks down altogether. Mill confessed the necessity of applying a different method, which he described with great ability, and which substantially amounts to the method of the older Economists. If, with some writers of the historical school, we admit the objections which apply to this method, we seem to be reduced to a hopeless state of uncertainty. A treatise on Political Economy becomes nothing but a miscellaneous collection of facts, with no definite clue or uniform method of reasoning. I must beg, in conclusion, to indicate what, so far as I can guess, seems to be the view suggested in presence of this difficulty. If I am asked whether Political Economy, understood, for example, as Mill understood it, is to be regarded as a science, I should have to admit that I could not simply reply, Yes. To say nothing of any errors in his logic, I should say that I do not believe that it gives us sufficient guidance even in regard to economic phenomena. We could not, that is, deduce from the laws accepted by Economists the necessary working of any given measure--say, the effect of protection or free trade, or, still more, the making of a poor-law system. Such problems involve elements of which the Economist, purely as an Economist, is an incompetent judge; and the further we get from those questions in which purely economical considerations are dominant, towards those in which other factors become relevant, --from questions as to currency, for example, to questions as to the relations of capitalists and labourers, --the greater the inadequacy of our methods. But I also hold that Political Economists may rightly claim a certain scientific character for their speculations. If their ultimate aim is to frame a science of economics which shall be part of the science--not yet.