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 group of which so little is known, and whose very existence hitherto has been generally questioned; and these, recognizing the brotherhood of slaves and freedmen and the poorest and saddest of the dwellers of the great city, not only helped them in their life, and associated them in all their dearest and most certain hopes, but gave them the "hospitality of the tomb"—constructing round the stately family crypt the corridors and funereal chambers where these poor and insignificant members of the Christian congregation might rest. The Priscilla Cemetery, dating as it does from the days of the apostle, is a great example of this loving Christian custom.

Now general tradition ascribes the foundation of this vast and ancient catacomb to Pudens, the wealthy senator; to his mother Priscilla, of whom beyond her name we know nothing; to her sainted daughters Prassedis and Pudentiana. The question then arises—Was this Pudens a member of the great house of the Acilii Glabriones? The leading Italian scholars in the lore of the catacombs think he certainly was. De Rossi even suspects that Pudens was the martyr consul himself. With our present knowledge this supposition cannot be decisively maintained. It is, however, an interesting hypothesis.

The Basilica of S. Sylvester, of which we shall speak presently, which was erected shortly after the Peace of the Church in the fourth century, was directly over the crypt of the Acilii Glabriones.

A very remarkable feature in the Catacomb of S. Priscilla are the reservoirs of water, which evidently served in very early days as baptisteries. The most considerable of these reservoirs or tanks is on the upper story of the cemetery, and is communicated with by a broad staircase of over twenty-five steps, which come out behind what was once the apsidal end of the Basilica of S. Sylvester. Marucchi describes it as "une vaste piscine encore pleine d'eau, desservie par un petit canal." This great baptistery became, from the fourth century onward, a spot of intense interest to the many pilgrims who visited the catacomb sanctuaries.

Another large reservoir of water has been found on the