is to say, the imagination of the poet is not, as is the case with the plastic arts and music by reason of the nature of the _materia_, through which they are reproductive, constrained in its creative activity in many directions, and forced to accept many others of a onesided or very partial completeness; it is on the contrary merely subservient to the essential requirements and general principle of an ideal and artistic presentation. From the many different points of view applicable to our present purpose, I will attempt to emphasize merely those of most importance, as for example, _firsts_ that which relates to the distinction between the _mode of composition_ employed respectively by poetry and prose; _secondly_, that which contrasts a _poetical work_ as completed with one of prose; and, _finally_, I propose to add a few observations relative to the subjective faculty which creates, or, shall we say, the _poet_ himself. I. THE COMPOSITION OF POETRY AND PROSE (_a_) In so far as the _content_ appropriate to poetical composition is concerned we may, relatively speaking at any rate, exclude the external world of natural fact. It is spiritual interests rather than the sun, mountains, landscape, or the bodily human form, and the like, which are its proper subject-matter. For, although it naturally embraces the element of sensuous impression and perception, it remains none the less, even in this respect, an activity of mind. Its main object is an intuition of ideality, to which it stands as spiritual activity in closer relation and affinity than is possible for external objects, as presented in their concrete substance to the senses. The world of Nature therefore only enters into the content of poetry in so far as mind discovers therein a stimulus or a material upon which to exercise its own energy; as, for example, where it is regarded as the environment of man, merely possessing essential worth in its relation to the ideality of conscious life, which moreover can put forward no claim to be itself the independent object of poetry. The object, in short, which fully corresponds to its appeal is the infinite realm of Spirit. For the medium of language, the most plastic medium possessed immediately by conscious life, and the one most competent to grasp its interests and movements in their ideal vitality, precisely as is the case with the material of the other arts, such as stone, colour, and tone, must necessarily and above all be employed to express that which it is most qualified to express. It is consequently the pre-eminent task of poetry to bring before our vision the energies of the life of Spirit, all that surges to and fro in human passion and emotion, or passes in tranquillity across the mind, that is the all-embracing realm of human idea, action, exploit, fatality, the affairs of this world and the divine Providence. It has been the most universal and cosmopolitan instructor of the human race and is so still. Instruction and learning