The =subject=, in its entirety, is the Adoration of the Lamb that was Slain, and it is mainly based on the passage in the Apocalypse: “I looked, and lo, a Lamb stood on the Mount Zion, and with Him an hundred and forty and four thousand, having His Father’s name written in their foreheads. . . . And I heard the voice of harpers harping with their harps.” Elsewhere we read: “I beheld, and, lo, a great multitude, which no man could number, clothed with white robes, and palms in their hands. . . . These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. Therefore are they before the throne of God; and He shall feed them, and shall lead them to living fountains of waters, and shall wipe away all tears from their eyes.” Much of the imagery, however, I believe, is also taken from the Te Deum. =Lower Tier.= The _central panel_ (original: attributed to Hubert) represents in its middle the altar, hung with red damask, and covered with a white cloth, on which the Lamb of God is standing. His blood flows into a crystal chalice. (This part is clearly symbolical of the Eucharist.) Upon Him, from above, descends the Holy Ghost, in the form of a dove, sent out by the Eternal Father, who occupies the central panel on top. Around the altar are grouped adoring angels, with many-coloured wings, holding the instruments of the Passion—the Cross, the Spear, the Sponge, and the Column to which Christ was fastened for flagellation. In front of it, two angels swing censers. The flowery foreground is occupied by the Fountain of Life, from which pure water flows limpid, to irrigate the smiling fields of Paradise. Four bands of worshippers converge towards this centre. On the left-hand side, stand, kneel, or ride, a group of worshippers representing, as a whole, the _secular aspect_ of the Christian Church—the laity. The foreground of this group is occupied by the precursors of Christ. Conspicuous among them are the Jewish prophets in front, and then the Greek poets and philosophers,—Homer, Plato, Aristotle—whom mediæval charity regarded as inspired in a secondary degree by the Spirit of Wisdom. Homer, in white, is crowned with laurel. The group also includes kings and other important secular personages. The right-hand side, opposite, is occupied by representatives of the Church, showing the religious as opposed to the secular half of the Christian world. In the front rank kneel 14 persons, the Twelve Apostles (with Paul and Matthias) in simple robes, barefooted; behind them are ranged all the orders of the hierarchy—canonized popes, with their attendant deacons; archbishops, bishops, and other dignitaries.