Two subjects are of frequent repetition in the catacombs, which bear a direct reference to the personal circumstances in which the Christians from time to time found themselves. One is that of Daniel in the lions' den,—the other that of the Three Children of Israel in the fiery furnace. Both were types of persecution and of deliverance. "Thy God, whom thou servest continually, he will deliver thee." Daniel is uniformly represented in the attitude of prayer,—the attitude adopted by the early Christians, standing with arms outstretched. Very often single figures with no names attached to them are thus represented above or by the side of graves. They were probably intended as figures of those who lay within them, figures of those who had been constant in prayer; and this conjecture is almost established as a certainty by the existence of a few of these figures with names inscribed above them,—as, for instance, "Hilara in pace."
Noah in the ark is also one of the repeated subjects from the Old Testament; the ark being represented as a sort of square box, in the middle of which Noah stands, sometimes in prayer, and sometimes with the dove flying towards him, bearing a branch of olive. It was the type of the Church, the whole body of Christians, floating in the midst of storms, but with the promise of peace; or, with wider signification, it was the type of the world saved through the revelation of Christ. It bore reference also to the words of St. Peter, in his First Epistle, concerning the ark, "wherein few, that is eight souls, were saved by water; the like figure whereunto, even baptism, doth also now save us by the resurrection of Jesus Christ." Sometimes, indeed, the act of baptism is represented in a more literal manner, by a naked figure immersed in the water; sometimes, perhaps, by still other types.
Paintings of the temptation and the fall of Adam and Eve, in which the composition often reminds one of that adopted by the later masters, are often seen on the walls; and the sacrifice of Abraham, in which with reverent and just simplicity the interference of the Almighty is represented by a hand issuing from the clouds, is a common subject. Less frequent are pictures of David with his sling, of Tobit with the fish, of Susanna and the elders, treated symbolically, and some few other Old Testament stories. Their typical meaning was plain to the minds of those who frequented the catacombs. From the Gospels many scenes are represented in addition to those we have already mentioned: among the most common are the miracle of the multiplication of the loaves; our Saviour seated, with two or more figures standing near him; and his restoring sight to the blind. Every year's new excavations bring to light some new picture, and our acquaintance with the Art of the catacombs is continually receiving interesting additions.
There appears to have been no definite rule in respect to the combination of subjects in a single chapel. The ceilings are generally divided into various compartments, each filled with a different subject. Thus, for example, we find on one of them the central compartment occupied by a figure of Orpheus; four smaller compartments are filled with sheep or cattle; and four others with Moses striking the rock, Daniel in the lions' den, David with his sling, and Jesus restoring the paralytic. At the angles of the vault are doves with branches of olive; and the ornaments of the ceiling are all of graceful and somewhat elaborate character. The purely ornamental portions of the paintings, though obviously formed on heathen originals, are almost universally of a pleasing and joyful character, and in many cases possess a symbolic meaning. Flowers, crowns of leaves, garlands, vines with clustering grapes, displayed more to the Christian's eyes than mere beauty of form. In these and other similar accessories the symbolism of the early Church delighted to manifest itself. On their terracotta lamps, fixed in the mortar at the head of graves, on their sepulchral tablets, on their rings, on their glass cups
