After this rapid sketch of what may be called the map of dramatic literature, we return to the examination of its fundamental ideas. Since, as we have already shown, visible representation is essential to the very form of the drama; a dramatic work may always be regarded from a double point of view,--how far it is _poetical_, and how far it is _theatrical_. The two are by no means inseparable. Let not, however, the expression _poetical_ be misunderstood: I am not now speaking of the versification and the ornaments of language; these, when not animated by some higher excellence, are the least effective on the stage; but I speak of the poetry in the spirit and design of a piece; and this may exist in as high a degree when the drama is written in prose as in verse. What is it, then, that makes a drama poetical? The very same, assuredly, that makes other works so. It must in the first place be a connected whole, complete and satisfactory within itself. But this is merely the negative definition of a work of art, by which it is distinguished from the phenomena of nature, which run into each other, and do not possess in themselves a complete and independent existence. To be poetical it is necessary that a composition should be a mirror of ideas, that is, thoughts and feelings which in their character are necessary and eternally true, and soar above this earthly life, and also that it should exhibit them embodied before us. What the ideas are, which in this view are essential to the different departments of the drama, will hereafter be the subject of our investigation. We shall also, on the other hand, show that without them a drama becomes altogether prosaic and empirical, that is to say, patched together by the understanding out of the observations it has gathered from literal reality.