Description as commonly understood is portrayal in language; specifically, poetical description is the esthetic representation of objects through the medium of speech. I shall assume for the purposes of the following discussion that such representation is possible, that poetry is, though not exclusively, a “representative” art. Such an assumption does not equate poetry and painting, since the media of an art determine the substance and form of that art. Now the media of poetic representation, mental images, have indeed many points of likeness to the actual sense perceptions through which the painter affects us, since mental images have their origin in percepts; otherwise they would be poor means of representing objects. But there exist also many obvious differences between images and percepts, such as different degrees of intensity, permanence, specificness. These differences condition differences between poetry and painting. There are other differences. The formative artist, for example, is confined to an appeal to the sense of sight, while the poet knows no such limitation. I shall take occasion in the course of the following discussion to call attention to such matters, when the examples are before us.