Maeterlinck has realised, better than any one else, the significance, in life and art, of mystery. He has realised how unsearchable is the darkness out of which we have but just stepped, and the darkness into which we are about to pass. And he has realised how the thought and sense of that twofold darkness invade the little space of light in which, for a moment, we move; the depth to which they shadow our steps, even in that moment's partial escape. But in some of his plays he would seem to have apprehended this mystery as a thing merely or mainly terrifying; the actual physical darkness sur-rounding blind men, the actual physical approach of death as the intruder; he has shown us people huddled at a window, out of which they are almost afraid to look, or beating at a door, the opening of which they dread. Fear shivers through these plays, creeping across our nerves like a damp mist coiling up out of a valley. And there is beauty, certainly, in this "vague spiritual fear"; but a less obvious kind of beauty than that which gives its profound pathos to _Aglavaine et Sélysette,_ the one play written since the writing of the essays. Here is mystery, which is also pure beauty, in these delicate approaches of intellectual pathos, in which suffering and death and error become transformed into something almost happy, so full is it of strange light. And the aim of Maeterlinck, in his plays, is not only to render the soul and the soul's atmosphere, but to reveal this strangeness, pity, and beauty through beautiful pictures. No dramatist has ever been so careful that his scenes should be in themselves beautiful, or has made the actual space of forest, tower, or seashore so emotionally significant. He has realised, after Wagner, that the art of the stage is the art of pictorial beauty, of the correspondence in rhythm between the speakers, their words, and their surroundings. He has seen how, in this way, and in this way alone, the emotion, which it is but a part of the poetic drama to express, can be at once intensified and purified.