Let me represent these maxims to you under a similitude. Everybody has looked (when young at least) through a kaleidoscope, and has observed the beauty of its many-coloured figures, their symmetrical shapes, and the enchantment of their succession. What magic creates this phantasmagoria? Some pretty bits of coloured glass, shining gewgaws, scraps of lace, fripperies, and other odds and ends, are put into a translucent box, and beheld through a tube fitted with mirrors which are set at an angle determined by optical law. The broken knick-knacks represent the facts of everybody's phenomenal kaleidoscope; the reflecting angle under which they are seen is its law; the coloured images are everybody's impressions of things, nature, and mankind. As long as you live, remember that whenever you are contemplating the world's phenomena--whenever you see facts of life, either great or small, you are looking at them through some optical instrument or another. If its law accords with their law, your view is truthful; but then it will be all the less pretty, the less symmetrical. There are dark spots in our real world, checks of all sorts, moral evil, anguish of heart and conscience, foresights, stern accountabilities! You have lost your childhood's magic glass, and have got a clear reflecting telescope in its stead! Pity to forego the nice kaleidoscope where all was so bright, so harmonious, and arrayed in such regular shapes. Yet the view it gave was worth what most people's views are worth--precisely nothing! Comte had his kaleidoscope. Every systematizer who allows no mystery, no darkness anywhere, must keep the article; in point of fact, most people enjoy having one. Alas! for the 19th century! It has such a feverish viewiness, such a fashion of incessantly turning its magic tube, that life seems little else than a dreamy phantasmagoria! To construct a steady reflecting instrument for yourself requires industry, time, and thought, three things which few people care to bestow upon their beliefs. Therefore the practice is to pick up kaleidoscopes ready-made at a cheap rate, and to feel as easy as stern realities will permit on the subject of their truthfulness. Romances are the kaleidoscopes of one class, cram-books of a second, newspapers of a third, self-love the optical law of the greatest number. We are met this morning to break up a grand kaleidoscope, and to look into its construction. I shall do my endeavour to prevent you all from replacing it by any instrument of a ready-made sort. The easiest plan for all lecturers is to display a series of transparent conclusions; but I shall prefer furnishing you with facts and arguments, letting you put them together, look at them, and verify their law of true vision for yourselves.