"To descend this aperture, signor, one struggles along with much difficulty: lying on one's chest, and with a lighted taper in one hand, the other holding a rope that has been made fast to a tree outside, one slides down by degrees feet foremost. The passages are usually narrowed and choked by the rubbish, and descend nearly perpendicularly to where, lower down, they open wider and your feet touch steps cut roughly in the rock; but you must not trust them, for the soft stone will crumble with your weight. After descending some sixty or seventy feet you suddenly bump against an old stone doorway, and you are at the bottom. But on passing the doorway your position is even worse, as the stagnant pools of muddy water reach up to your knees, and the passages are too low to admit of your standing upright, while you stretch your taper into a thick darkness that closes over everything a few yards distant and prevents your seeing anything but the horizontal niches in tiers, one above the other, where the mortal remains of the beatific lie surrounded by the symbols of the faith they died for. Here they keep their vigil century after century over our Holy City, while they await their glorious resurrection. "I have been miles under the Campagna in these subterranean cemeteries. No one has yet ascertained their entire extent. They branch out in every direction, and the ramifications are so countless--not only on a level, but in stories underlying one another--and so many of them have fallen in or been filled with water, that no successful attempt has ever been made to follow them to their extremities. Nor can it be found out whether they communicate with one another or remain as they were originally, distinct from each other. "You have heard, signor, that the early Christians celebrated the feasts of the Church by visiting the then newly-decorated and consecrated subterranean cemeteries, and that on one of these occasions, when a large crowd of persons had entered to celebrate a festival, it occurred to the ruling authorities that the opportunity might be advantageously used to lessen by so many the troublesome and ever-increasing population of the new faith. Accordingly, a number of huge stones were brought and the entrance built up and rigidly guarded till all the unfortunate prisoners had died a martyr's death. "After that, to guard against a repetition of such an act, various apertures of exit were made, and may now be frequently found on the Campagna, where, when one's foot sinks into a doubtful-looking hole filled with rubbish, one knows it penetrates to the depths beneath. Secret passages were also made to debouch in the private houses of well-known Christians or buildings set apart for Christian worship; and it was from one of these walled-up doorways that I, Beppo Donati, myself saw _un miracolo_ performed and a legion of devils let loose.