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1858.] calculated to contain about an eighth part of that cemetery. The greatest length of the portion thus measured is not more than seven hundred feet, and its greatest width about five hundred and fifty; nevertheless, if we measure all the streets that it contains, their united length scarcely falls short of two English miles. This would give fifteen or sixteen miles for all the streets in the cemetery of St Agnes." Taking this as a fair average of the size of the catacombs, for some are larger and some smaller, we must assign to the streets of graves already known a total length of about three hundred miles, with a probability that the unknown ones are at least of equal length. This conclusion appears startling, when one thinks of the close arrangement of the lines of graves along the walls of these passages. The height of the passages varies greatly, and with it the number of graves, one above another; but the Padre Marchi, who is competent authority, estimates the average number at ten, that is, five on each side, for every seven feet,—which would give a population of the dead, for the three hundred miles, of not less than two millions and a quarter. No one who has visited the catacombs can believe, surprising as this number may seem, that the Padre Marchi's calculation is an extravagant one as to the number of graves in a given space. We have ourselves counted eleven graves, one over another, on each side of the passage, and there is no space lost between the head of one grave and the foot of another. Everywhere there is economy of space,—the economy of men working on a hard material, difficult to be removed, and laboring in a confined space, with the need of haste.

This question of the number of the dead in the catacombs opens the way to many other curious questions. The length of time that the catacombs were used as burial-places; the probability of others, beside Christians, being buried in them; the number of Christians at Rome during the first two centuries, in comparison with the total number of the inhabitants of the city; and how far the public profession of Christianity was attended with peril in ordinary times at Rome, previously to the conversion of Constantine, so as to require secret and hasty burial of the dead;—these are points demanding solution, but of which we will take up only those relating immediately to the catacombs.

There can, of course, be no certainty with regard to the period when the first Christian catacomb was begun at Rome,—but it was probably within a few years after the first preaching of the Gospel there. The Christians would naturally desire to separate themselves in burial from the heathen, and to avoid everything having the semblance of pagan rites. And what mode of sepulture so natural for them to adopt, in the new and affecting circumstances of their lives, as that which was already familiar to them in the account of the burial of their Lord? They knew that he had been "wrapped in linen, and laid in a sepulchre which was hewn out of a rock, and a stone had been rolled unto the door of the sepulchre." They would be buried as he was. Moreover, there was a general and ardent expectation among them of the second coming of the Saviour; they believed it to be near at hand; and they believed also that then the dead would be called from their graves, clothed once more in their bodies, and that as Lazarus