The _Inner Right Wing_ (copy: the original, likewise attributed to Jan, is also at Berlin) has an angel (_not_ St. Cecilia) playing an organ, with other angels accompanying on various musical instruments. Taking it in its entirety, then, the altar-piece, when opened, is a great =mystical poem= of the Eucharist and the Sacrifice of the Lamb, with the Christian folk, both Church and World, adoring. It was in order to prepare your mind for recognition of this marked strain of mysticism in the otherwise prosaic and practical Flemish temperament, that I called your attention at Bruges to several mystic or type-emphasising pictures, in themselves of comparatively small æsthetic value. The composition contains over 200 figures. Many of them, which I have not here identified, can be detected by a closer inspection, which, however, I will leave to the reader. Now, ask the sacristan to =shut the wings=. They are painted on the _outer side_ (all a copy) mainly in grisaille, or in very low tones of colour, as is usual in such cases, so as to allow the jewel-like brilliancy of the internal picture to burst upon the observer the moment the altar-piece is opened. The _lower wings_ have (in this copy) representations of the Four Evangelists, in niches, in imitation of statuary. Observe the half-classical pose and costume of Luke, the Beloved Physician. These figures, however, were not so arranged in the original, as I shall afterwards explain. The _upper wings_ represent on their first or lowest tier, the Annunciation, a frequent subject for such divided shutters. In the centre is the usual arcade, giving a glimpse of the town of Ghent where Hubert painted it. (The scene is said to be Hubert’s own studio, which stood on the site of the Café des Arcades in the Place d’Armes: the view is that which he saw from his own windows.) To the L., as always, is the angel Gabriel, with the Annunciation lily; to the R. is Our Lady, reading. The Dove descends upon her head. The ordinary accessories of furniture are present—prie-dieu, curtain, bed-chamber, etc. Note this arrangement of the personages of the Annunciation, with the empty space between Our Lady and the angel: it will recur in many other pictures. Observe also the Flemish realism of the painter, who places the scene in his own town at his own period: and contrast it with the mysticism of the entire conception. The _uppermost tier_ of all is occupied by figures of two Sibyls (universally believed in the Middle Ages to have prophesied of Christ) as well as two half-length figures of the prophets Zachariah and Micah, (also as foretellers of the Virgin birth).