human life must be a very different matter from what we poor players on the scene imagine it; we are cutting a very different figure, not only from that which faces us from the mirror of vanity, but from that which is "as ithers see us." Not only, then, may our tragedy be comedy; our comedy may be tragedy. The play of humour at least suggests these alternatives. Life is Janus-faced, and the humourist invests his characters with a double mask; they stand for comedy as well as for tragedy; Don Quixote wears the buskin as well as the sock. Humour, whose definition has always eluded analysis, may, perhaps (to attempt a definition _currente calamo_), be that subtle flashing from one aspect to another, that turning the coin so rapidly that one seems to see simultaneously the face and the reverse, the pity and the humour of life, and knows not whether to laugh or weep. Humour is, then, the simultaneous revelation of the dual aspects of life; the synthetical fusion of opposites; the gift of writing with a double pen, of saying two things in one, of showing shine and shadow together. This is why the humourist has always the gift of pathos; though the gift of pathos does not equally imply the gift of humour. The tragic writer must always produce one-sided work, so must the "funnyman" who were only a "funny man" and not a humourist (though this is rarer). Each can only show one side of life at a time; the humourist alone can show both. Great novels of romance and adventure, great works of imagination, great poems, may be written by persons without humour; but only the humourist can reproduce life. Milton is great; but the poet of life is Shakespeare. Thus the whole case of "realism" falls to the ground. There being no "facts," Zola's laborious series is futile; it may be true to art, but it is not true to life. His vision is incomplete, is inexhaustive; it lacks humour, and to the scientific novelist the lack of humour is fatal. He is the one novelist who cannot succeed without it. Leave out humour, and you may get art and many other fine things, but you do not get the lights and shadows or the "values" of life.