But whatever the material or style of the throne, whether simple or gorgeous, it is supposed to be a heavenly throne. It is not of the earth, nor on the earth; and at first it was alone and unapproachable. The Virgin-mother, thus seated in her majesty, apart from all human beings, and in communion only with the Infant Godhead on her knee, or the living worshippers who come to lay down their cares and sorrows at the foot of her throne and breathe a devout "Salve Regina!"--is, through its very simplicity and concentrated interest, a sublime conception. The effect of these figures, in their divine quietude and loveliness, can never be appreciated when hung in a gallery or room with other pictures, for admiration, or criticism, or comparison. I remember well suddenly discovering such a Madonna, in a retired chapel in S. Francesco della Vigna at Venice,--a picture I had never heard of, by a painter then quite unknown to me, Fra Antonio da Negroponte, a Franciscan friar who lived in the fifteenth century. The calm dignity of the attitude, the sweetness, the adoring love in the face of the queenly mother as with folded hands she looked down on the divine Infant reclining on her knee, so struck upon my heart, that I remained for minutes quite motionless. In this picture, nothing can exceed the gorgeous splendor of the Virgin's throne and apparel: she wears a jewelled crown; the Child a coronal of pearls; while the background is composed entirely of the mystical roses twined in a sort of _treillage_. I remember, too, a picture by Carlo Crivelli, in which the Virgin is seated on a throne, adorned, in the artist's usual style, with rich festoons of fruit and flowers. She is most sumptuously crowned and apparelled; and the beautiful Child on her knee, grasping her hand as if to support himself, with the most _naïve_ and graceful action bends forward and looks dawn benignly on the worshippers _supposed_ to be kneeling below. When human personages were admitted within the same compartment, the throne was generally raised by several steps, or placed on a lofty pedestal, and till the middle of the fifteenth century it was always in the centre of the composition fronting the spectator. It was a Venetian innovation to place the throne at one side of the picture, and show the Virgin in profile or in the act of turning round. This more scenic disposition became afterwards, in the passion for variety and effect, too palpably artificial, and at length forced and theatrical.