import of the picture only incompletely. If I describe in words Millet's painting of the "Sower" according to my understanding of it, I am telling in my own terms what the picture means to me. What it meant to Millet, the full and true significance of the situation as the painter felt it, is there expressed upon his canvas in terms of visible aspect; and correspondingly, Millet's meaning is fully and truly received in the measure that we feel in ourselves the emotion roused by the sight of his color and form. The essential content of a work of art, therefore, is modified in its effect upon us by the kind of medium in which it is presented. If an idea phrased originally in one medium is translated into the terms of another, we have _illustration._ Turning the pages of an "illustrated" novel, we come upon a plate showing a man and a woman against the background of a divan, a chair, and a tea-table. The man, in a frock coat, holding a top hat in his left hand, extends his right hand to the woman, who has just risen from the table. The legend under the picture reads, "Taking his hat, he said good-by." Here the illustrator has simply supplied a visible image of what was suggested in the text; the drawing has no interest beyond helping the reader to that image. It is a statement of the bare fact in other terms. In the hands of an artist, however, the translation may take on a value of its own, changing the original idea, adding to it, and becoming in itself an independent work of art. This value derives from the form into which the idea is translated. The frescoes of the Sistine Chapel are only sublime illustration; but how little of their power attaches to the subject they illustrate, and how much of their sublimity lies in the painter's rendering! Conversely, an example of the literary interpretation of a picture is Walter Pater's description of Leonardo's Mona Lisa.