trying how in point of fact they will work; it is so hard to remember that they are only assumptions that we generally call them self-evident truths. Considering how many assumptions are involved even in the very structure of language itself; how we are led into all kinds of difficulties by the essential instrument of thought, which has been fashioned by the unconscious logic of our ancestors; it is not strange that the best that can be said of philosophies is, that they represent convenient working hypotheses. That, at least, seems to be a liberal view of their logical value. In another sense they are really to be considered as poetry, rather than as logic. They are modes of presenting certain conceptions of the world by apparently logical formulæ, instead of by concrete imagery; but, substantially, they represent the emotions with which men regard their dwelling place, and are radically imperfect if we insist upon considering them as providing us with correct plans and drawings of its various arrangements. Let us look for a moment at another set of reflections upon which Mr. Balfour touches. What has been the influence of these systems upon men's lives? Have these provisional constructions, these fluctuating, conflicting, unstable combinations of pretentious formulæ, really decided or directed the course of human history? It would seem so, if you read certain histories of philosophy. They seem to suggest that the hinge upon which all the course of human affairs ultimately turns is the growth of certain metaphysical conceptions. There is a preliminary difficulty in seeing how such pretensions can be established. The philosopher in his study or his lecture room discusses problems in which the enormously preponderating majority of the race has so little interest, that it is not even aware that there are any such problems to be discussed. He lays down dogmas so vague and unsatisfactory that half his hearers give up the attempt to understand, or understand them in a sense which the more intelligent half would utterly repudiate; and that intelligent half is itself divided into different schools, interpreting the dogmas in radically contradictory ways. Is it not hard to believe that speculation leads to vast results, when for ninety-nine men out of a hundred it is practically non-existent, and with the small minority it amounts to providing new weapons for endless controversy? We must, of course, admit that men's conduct is in some sense determined by their thoughts. Change the radical beliefs, and you will certainly change the whole constitution of society. And, again, it is obvious that in one sphere of thought the progress of inquiry is of vast importance. Nobody can deny that scientific and mechanical discoveries have, for good or evil, materially affected our lives. The great inventions of modern times, from gunpowder and printing to the steam-engine and electricity, have changed things as much as if they had altered the physical