"During the persecutions of the early Christians under the heathen Emperors of Rome, they resorted, as you are aware, to the subterranean catacombs there, as the only places where they could, in comparative safety, hold their religious services. Here the stone altar-tombs of those who had suffered martyrdom offered the most convenient and fitting altars for the celebration of the Holy Eucharist. In after times, when the Church was prosperous and at peace, the remembrance of these altar-tombs not only suggested the material for the Christian altar, but also the custom of erecting it over the relics of saints and martyrs. This custom of building the altar over the bones of martyrs (which is still continued in the Roman Church, but which has for many years ceased to be the practice in our own), is, moreover, supposed to have reference to that mysterious vision in the Revelation of St. John, which you will remember he thus describes: 'When the Lamb had opened the fifth seal, I saw under the altar the souls of them that were slain for the Word of God, and for the testimony which they held[151].' "The use of stone instead of wood was, no doubt, adopted also for other reasons than the one I have stated. Stone altars were less liable to desecration; they possess, too, a symbolism of their own, representing both the _incarnation_ and _entombment_ of our Blessed Lord[152]. The scriptural symbol of a Rock[153], as representing our Lord, might appear to be more evidently connected with the stone than the wooden altar, but this symbol must always be associated with the idea of altar, of whatever material it is made. The wooden altar, on the other hand, may seem to refer more directly to the _institution_ of the _Lord's Supper_; and the altar candlesticks have, of course, a peculiar and very manifest appropriateness when the altar is so considered." "But surely, my friend, the word _table_ seems to be here exactly applicable."