On other graves beside those of the martyrs there are often found some little signs by which they could be easily recognized by the friends who might wish to visit them again. Sometimes there is the impression of a seal upon the mortar; sometimes a ring or coin is left fastened into it; often a terra-cotta lamp is set in the cement at the head of the grave. Touching, tender memorials of love and piety! Few are left now in the opened catacombs, but here and there one may be seen in its original place,the visible sign of the sorrow and the faith of those who seventeen or eighteen centuries ago rested upon that support on which we rest to-day, and found it, in hardest trial, unfailing.
But the galleries of the catacombs are not wholly occupied with graves. Now and then they open on either side into chambers (cubicula) of small dimension and of various form, scooped out of the rock, and furnished with graves around their sides,the burial-place arranged beforehand for some large family, or for certain persons buried with special honor. Other openings in the rock are designed for chapels, in which the burial and other services of the Church were performed. These, too, are of various sizes and forms; the largest of them would hold but a small number of persons;6 but not unfrequently two stand opposite each other on the passage-way, as if one were for the men and the other for the women who should be present at the services. Entering the chapel through a narrow door whose threshold is on a level with the path, we see at the opposite side a recess sunk in the rock, often semicircular, like the apsis of a church, and in this recess an arcosolium,which served at the same time as the grave of a martyr and as the altar of the little chapel. It seems, indeed, as if in many cases the chapel had been formed not so much for the general purpose of holding religious service within the catacombs, as for that of celebrating worship over the remains of the martyr whose body had been transferred from its original grave to this new tomb. It was thus that the custom, still prevalent in the Roman Church, of requiring that some relics shall be contained within an altar before it is held to be consecrated, probably began. Perhaps it was with some reference to that portion of the Apocalypse in which St. John says, "I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held. And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellow-servants also and their brethren that should be killed as they were should be fulfilled."7 At any rate, these words must have dwelt in the memories of the Christians who came to worship God in the presence of the dead by whom they were surrounded in the catacombs. But they knelt before the altar-tombs, not as before altars consecrated with relics of saints, but as before altars dedicated to God and connected with the memory of their own honored and beloved dead, whom he had called from them into his holy presence.
It is impossible to ascertain the date at which these chapels were first made; probably some time about the middle of the second century they became common. In many of the catacombs they are very numerous, and it is in them that the chief ornaments and decorations, and the paintings which give to the catacombs an especial value and importance in the history of Art, and which are among the most interesting illustrations of the state of religious feeling and belief in the early centuries, are found. Some of the chapels are known to be of comparatively late date, of the fourth and perhaps of the fifth century. In several even of earlier construction is found, in addition to the altar, a niche cut out in the rock, or a ledge projecting from it, which seems to have been intended to serve the place of the credence table, for holding the articles used in the service of the altar, and at a later period for receiving the elements before they were handed to the priest for consecration. The earliest services in the catacombs were undoubtedly those connected with the communion of the Lord's Supper. The mystery of the mass and the puzzles of transubstantiation had not yet been introduced among the believers; but all who had received baptism as followers of Christ, all save those who had fallen away into open and manifest sin, were admitted to partake of the Lord's Supper. Possibly upon some occasions these chapels may have been filled with the sounds of exhortation and lamentation. In the legends of the Roman Church we read of large numbers of Christians being buried alive, in time of persecution, in these underground chambers where they had assembled for worship and for counsel. But we are not aware of any proof of the truth of these stories having been discovered in recent times. This, and many other questionable points in the history and in the uses of the catacombs, may be solved by the investigations which are now proceeding; and it is fortunate for the interests, not only of truth, but of religion, that so learned and so honest-minded a man as the Cavaliere de Rossi should have the direction of these explorations.
Few of the chapels that are to be seen now in the catacombs are in their original condition. As time went on, and Christianity became a corrupt and imperial religion, the simple truths which had sufficed for the first Christians were succeeded by doctrines less plain, but more adapted to touch cold and materialized imaginations, and to inflame dull hearts. The worship of saints began, and was promoted by the heads of the Church, who soon saw how it might be diverted to the purposes of personal and ecclesiastical aggrandizement. Consequently the martyrs were made into a hierarchy of saintly protectors of the strayed flock of Christ, and round their graves in the catacombs sprang up a harvest of tales, of visions, of miracles, and of superstitions. As the Church sank lower and lower, as the need of a heavenly advocate with God was more and more impressed upon the minds of the Christians of those days, the idea seems to have arisen that neighborhood of burial to the grave of some martyr might be an effectual way to secure the felicity of the soul. Consequently we find in these chapels that the later Christians, those perhaps of the fifth and sixth centuries, disregarding the original arrangements, and having lost all respect for the Art, and all reverence for the memorial pictures which made the walls precious, were often accustomed to cut out graves in the walls above and around the martyr's tomb, and as near as possible to it. The instances are numerous in which pictures of the highest interest have been thus ruthlessly defaced. No sacredness of subject could resist the force of the superstition; and we remember one instance where, in a picture of which the part that remains is of peculiar interest, the body of the Good Shepherd has been cut through for the grave of a child,so that only the feet and a part of the head of the figure remain.
There is little reason for supposing, as has frequently been done, that the catacombs, even in times of persecution, afforded shelter to any large body of the faithful. Single, specially obnoxious, or timid individuals, undoubtedly, from time to time, took refuge in them, and may have remained within them for a considerable period. Such at least is the story, which we see no reason to question, in regard to several of the early Popes. But no large number of persons could have existed within them. The closeness of the air would very soon have rendered life insupportable; and supposing any considerable number had collected near the outlet, where a supply of fresh air could have reached them, the difficulty of obtaining food and of concealing their place of retreat would have been in most instances insurmountable. The catacombs were always places for the few, not for the many; for the few who followed a body to the grave; for the few who dug the narrow, dark passages in which not many could work; for the few who came to supply the needs of some hunted and hidden friend; for the few who in better times assembled to join in the service commemorating the last supper of their Lord.